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Manufacturing Engineering Practice Quiz

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Manufacturing Engineering Practice Quiz

shape Introduction

What is Manufacturing Engineering? Manufacturing engineers develop and create physical artifacts, production processes, and technology. Manufacturing Engineering , a subset of mechanical engineering is primarily focused on the design, development and operation of integrated systems of production to obtain high quality & economically competitive products. The systems can include material handling equipment, machine tools, robots or even computers or networks of computers. Manufacturing engineers are primarily responsible for the design, development, implementation, operation and management of manufacturing system thus making them key personnel in a manufacturing industry.

Manufacturing Engineering is an important topic in Mechanical Engineering subjects. Manufacturing Engineering Practice Quiz article, is exceedingly important for candidates preparing for RRB Junior Engineer Recruitment, SSC Junior Engineer Recruitment, GATE, UPSC (Civil services exam including IAS) and all Mechanical Engineering Exams and etc. In this article, candidates can find different types of questions with solution related to the Manufacturing Engineering topic. The article Manufacturing Engineering Practice Quiz, will assist the students understanding of the type of questions expected from the topic Manufacturing Engineering.

shape Quiz

1. The cutting edge of the tool is perpendicular to the direction of tool travel in
    A. orthogonal cutting of metals B. oblique cutting of metal C. both (a) and (b) D. none of these

Answer - Option A
2. The cutting edge of the tool is inclined at an angle less than 90° to the direction of tool travel in
    A. orthogonal cutting of metals B. oblique cutting of metals C. both (a) and (b) D. none of these

Answer - Option B
3. Two components of the cutting forces which are perpendicular are acting on the cutting tool in
    A. orthogonal cutting of metal B. oblique cutting of metal C. both (a) and (b) D. none of these

Answer - Option A
4. Orthogonal cutting system is also known as
    A. one-dimensional cutting system B. two-dimensional cutting system C. three-dimensional cutting system D. none of these

Answer - Option B
5. Three components of the cutting forces which are mutually perpendicular are acting at the cutting edge in
    A. orthogonal cutting of metals B. oblique cutting of metals C. both (a) and (b) D. none of these

Answer - Option B
6. In orthogonal cutting system
    A. cutting tool prepares a surface parallel to the work face B. chip flows over the tool face and direction of the chip flow velocity is normal to the cutting edge C. maximum chip thickness occur s at the middle D. all of these

Answer - Option D
7. In oblique cutting system
    A. cutting edge of the tool may or may not prepare a surface parallel to the work face B. maximum chip thickness may not occur at the middle C. more than one cutting edges are in action D. all of these

Answer - Option D
8. In metal cutting operations discontinuous chips are produced while machining
    A. brittle material B. ductile material C. hard material D. soft material

Answer - Option A
9. In metal cutting operations continuous chips are produced while machining
    A. brittle material B. ductile material C. hard material D. soft material

Answer - Option B
10. When material is ductile and cutting speed is high, then
    A. continuous chips are formed B. continuous chips with built-up edges are formed C. discontinuous chips are formed D. none of these

Answer - Option A
11. When material is ductile and cutting speed is low, then chips formed are
    A. continuous B. continuous chips with build-up edges C. discontinuous D. none of these

Answer - Option B
12. When material is brittle, non ductile and cutting speed is low, then
    A. continuous chips are formed B. continuous chips with built-up edges are formed C. discontinuous chips are formed D. none of these

Answer - Option C
13. In metal cutting operations, chips are formed due to
    A. linear deformation B. shear deformation C. linear translation D. none of these

Answer - Option B
14. Discontinuous chips are formed during machining of
    A. cast iron B. mild steel C. aluminium D. none of these

Answer - Option A
15. Continuous chips are formed during machining of
    A. cast iron B. mild steel C. aluminium D. none of these

Answer - Option B
16. With increase of cutting speed, the built-up edge
    A. becomes longer B. smaller or finally does not form C. may or may not form D. none of these

Answer - Option B
17. Material having highest cutting speed is
    A. cast iron B. bronze C. aluminium D. high carbon steel

Answer - Option C
18. Material having lowest cutting speed is
    A. cast iron B. bronze C. aluminium D. high carbon steel

Answer - Option D
19. Chips with built-up edges are for med while machining
    A. brittle material B. ductile material C. cast material D. all of these

Answer - Option C
20. In metal cutting operations, shear angle is defined as the angle made by the shear plane with the
    A. tool axis B. direction of tool travel C. central plane of work piece D. none of these

Answer - Option B
21. Angle made by the face of tool and the plane parallel to the base of the cutting tool is called
    A. lip angle B. rake angle C. cutting angle D. clearance angle

Answer - Option B
22. Angle between the tool face and the ground end surface of flank is called
    A. lip angle B. rake angle C. cutting angle D. clearance angle

Answer - Option A
23. Angle between the tool face and a line tangent to the machined surface at the cutting point is called
    A. lip angle B. rake angle C. cutting angle D. clearance angle

Answer - Option C
24. Angle between the shear plane and work surface is called
    A. lip angle B. rake angle C. cutting angle D. shear angle

Answer - Option D
25. Angle on which the strength of the tool depends is
    A. lip angle B. rake angle C. cutting angle D. clearance angle

Answer - Option B
1. For brittle material like brass, the rake angle provided is
    A. 0 B. negative C. positive D. none of these

Answer - Option A
2. For copper, the rake angle provided is
    A. O B. positive C. negative D. none of these

Answer - Option C
3. Carbide tipped tools generally have rake angle
    A. 0 B. positive C. negative D. none of these

Answer - Option C
4. For machining brass by high speed steel tool, the rake angle provided is
    A. 0 B. positive C. negative D. none of these

Answer - Option A
5. Negative rake angles are provided to
    A. give better finish B. increase strength of cutting tool point C. decrease temperature rise at the tool-tip D. all of these

Answer - Option D
6. Negative rake angles are used for
    A. heavy loads B. carbide tools C. hard materials D. all of these

Answer - Option D
7. Cemented carbide tool are generally poor in
    A. torsion B. tension C. compression D. shear

Answer - Option D
8. Binding material used in cemented car bide tools is
    A. nickel B. cobalt C. chromium D. silicon

Answer - Option B
9. Cutting tool used on lathe, shaper and planer is
    A. single point B. two point C. three point D. multi point

Answer - Option A
10. Cutting tool used on milling and breaching machine is
    A. single point B. two point C. three point D. multi point

Answer - Option D
11. A single point tool hasall of these
    A. lip angle B. rake angle C. cutting angle D. all of these

Answer - Option D
12. Lip angle of a single point tool is generally in the range
    A. 20° to 40° B. 40° to 50° C. 50° to 60° D. 60° to 80°

Answer - Option D
13. In a single point tool the angle by which the face of the tool is inclined towards back is called
    A. side rake angle B. back rake angle C. end relief angle D. side relief angle

Answer - Option B
14. In a single point tool, the angle by which the face of the tool is inclined sideways, is called
    A. side rake angle B. back rake angle C. end relief angle D. side relief angle

Answer - Option A
15. Angle provided in a single point tool to control chip flow is
    A. side rake angle B. back rake angle C. end relief angle D. side relief angle

Answer - Option A
16. To prevent tool from rubbing the work, angle provided on tools is
    A. lip angle B. rake angle C. clearance angle D. relief angle

Answer - Option D
17. Relief angles on high speed tools generally vary in the range
    A. 0° to 5° B. 5° to 10° C. 10° to 20° D. 20° to 30°

Answer - Option D
18. In a single point tool, the angle between the surface of the flank immediately below the point and a plane at right angles to the centre line of the point of tool, is called
    A. side relief angle B. end relief angle C. side rake angle D. back rake angle

Answer - Option A
19. I n a single point tool, the angle between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base, is called
    A. side relief angle B. end relief angle C. side rake angle D. back rake angle

Answer - Option B
20 Velocity of tool relative to work piece is called
    A. cutting velocity B. chip velocity C. shear velocity D. average velocity

Answer - Option A
21. Velocity of tool along the tool face is called
    A. cutting velocity B. chip velocity C. shear velocity D. average velocity

Answer - Option B
22. Vector sum of cutting and chip velocities is equal to
    A. shear velocity B. average velocity C. both (a) and (b) D. none of these

Answer - Option A
23. Velocity of chip relative to the tool is acting
    A. along the tool face B. along the shear plane C. normal to the shear plane D. normal to the tool face

Answer - Option A
24. Velocity of chip relative to the work-place is acting
    A. along the tool face B. along the shear plane C. normal to the shear plane D. normal to the tool face

Answer - Option B
25. Chip thickness ratio is the ratio of
    A. cutting velocity to chip velocity B. depth of cut to chip thickness C. chip thickness to depth of cut D. none of these

Answer - Option B
1. Cutting ratio is the ratio of
    A. chip velocity to cutting velocity B. chip thickness to depth of cut C. cutting velocity to chip velocity D. none of these

Answer - Option A
2. Chip compression factor is equal to
    A. chip thickness ratio B. [latex]{1}{chip thickness ratio}[/latex] C. chip thickness ratio × shear angle D. none of these

Answer - Option B
3. In metal cutting operations, chips are formed due to
    A. elastic deformation of metal B. plastic deformation of metal C. elastic plastic deformation of metal D. all of these

Answer - Option B
4. In metal machining, due to plastic deformation of metal maximum heat is generated in the
    A. shear zone B. friction zone C. work-tool contact zone D. none of these

Answer - Option A
5. In metal machining, due to friction between the moving chip and the tool face, heat is generated in the
    A. shear zone B. friction zone C. work-tool contact zone D. none of these

Answer - Option B
6. In metal machining due to burnishing friction, heat is generated in the
    A. shear zone B. friction zone C. work-tool contact zone D. none of these

Answer - Option C
7. The coefficient of friction between chip and tool can be reduced by reducing the
    A. depth of cut B. width of tool C. effective rank angle D. any of these

Answer - Option B
8. The depth of cut depends upon
    A. cutting speed B. tool material C. rigidity of machine tool D. all of these

Answer - Option D
9. Depth of cut for roughing operation as compared to finishing operation is
    A. more B. less C. same D. none of these

Answer - Option A
10. Feed depends upon
    A. depth of cut B. rigidity of machine C. finish required D. all of these

Answer - Option D
11. The average cutting speed for machining a cast iron by a high speed steel tool is
    A. 10 m / min B. 22 m / min C. 30 m / min D. 300 m / min

Answer - Option C
12. The average cutting speed for machining a cast iron by a high speed steel tool is
    A. 10 m / min B. 22 m / min C. 30 m / min D. 300 m / min

Answer - Option B
13. Cutting speed is generally low for
    A. soft material B. castings C. regular shaped materials D. none of these

Answer - Option B
14. The average cutting speed for machining copper alloys by a high speed steel tool is
    A. 10 m / min B. 22 m / min C. 30 m / min D. 300 m / min

Answer - Option D
15. In most high speed milling cutters, positive radial rake angle is
    A. 10 – 15° B. 7 – 10° C. 20 – 25° D. 15 – 20°

Answer - Option D
16. In machine tools, chatter is due to
    A. free vibrations B. random vibrations C. forced vibrations D. self-excited vibrations

Answer - Option D
17. The usual ratio of forward and return stoke in shaper is
    A. 2 : 1 B. 1 : 2 C. 2 : 3 D. 3 : 2

Answer - Option D
18. In piercing and punching operations, the angle of shear is provided on
    A. die B. punch C. both on punch and die D. not provided to all

Answer - Option B
19. In piercing operation, the clearance is provided on
    A. die B. punch C. half on die and half on punch D. may be provided on any member

Answer - Option A
20. In drawing operation, increase of punch radius
    A. has much influence on punch load and it decreases B. does not influence the punch load much C. punch load increases D. punch load depends on other factors

Answer - Option B
21. Angular clearance provided on dies is of the order of
    A. 5 to 10° B. 3 to 5° C. [latex]\frac {1}{2}[/latex] to 1° D. 0.1 to 0.5°

Answer - Option C
22. Centre of pressure of a piece to be blanked or pierced in power press lies at
    A. c.g. of area of piece B. c.g. of perimeter of piece C. centre of piece D. centre of percussion

Answer - Option B
23. In drawing operation, increase of die radius
    A. has much influence of punch load and it decreases B. does not influence the punch load much C. punch load increases D. punch load depends on other considerations

Answer - Option A
24. Bending operation should be performed
    A. parallel to the grain direction B. at 30° to the grain direction C. at right angle to the grain direction D. there is no such criterion

Answer - Option C
25. In bending operation, the metal takes shape of
    A. die B. punch C. average of two D. could take any shape

Answer - Option B
1. In blanking operation, the clearance is provided on
    A. die B. punch C. half on die and half on punch D. may be provided on any member

Answer - Option B
2. Most practical method of taking care of spring back during bending is to
    A. try a sample, make the necessary adjustment and try again B. punching the inside corner of bend C. use hollow concave punches D. undercutting the punch so that the material is free to over bend

Answer - Option A
3. Sheradising is
    A. a zinc diffusion process B. an oxidizing process used for aluminium and magnesium articles C. a process used for making this phosphate coatings on steel to act as base D. the process of coating of zinc by hot dipping

Answer - Option A
4. Average cutting speed in machining mild-steel by single point tool of H.S.S. is
    A. 10 m / mt B. 20 m / mt C. 30 m / mt D. 40 m / mt

Answer - Option C
5. Tool life is said to be over if
    A. poor surface finish is obtained B. sudden increase in power and cutting force with chattering take place C. overheating and fuming due to friction start D. all of these

Answer - Option D
6. Tool life is most affected by
    A. cutting speed B. tool geometry C. feed and depth D. micro-structure of material being cut

Answer - Option A
7. Flank wear occurs mainly on
    A. nose part, front relief face and side relief face B. nose part and top face C. cutting edges D. all of these

Answer - Option A
8. Property essential for a tool material used for high speed machining is
    A. red hardness and impact resistance B. red hardness and wear resistance C. toughness and impact resistance D. red hardness, wear resistance and toughness.

Answer - Option D
9. Most machinable metal is one which
    A. produces discontinuous chips B. permits maximum metal removal per tool grind C. results in maximum length of shear plane D. results in minimum value of shear angle

Answer - Option B
10. It is possible to correlate tool life with which of the following property of the metal ?
    A. grain size B. toughness C. hardness D. micro constituents

Answer - Option C
11. The metal in machining operation is removed by
    A. tearing chips B. distortion of metal C. shearing the metal across a zone D. cutting the metal across a zone

Answer - Option C
12. Average cutting speed in machining cast iron by a single point cutting tool of H.S.S. is
    A. 6 m / mt B. 11 m / mt C. 22 / mt D. 33 m / mt

Answer - Option C
13. Galvanizing is
    A. zinc diffusion process B. an oxidizing process used for aluminium and magnesium articles C. a process used for making thin phosphate coating on steel to act as a base or primer for enamels and paints D. the process of coating of zinc by hot dipping

Answer - Option D
14. The front rake required to machine brass by H.S.S. tool is
    A. 15° B. 10° C. 5° D. 0°

Answer - Option D
15. Best all-round coolant for carbide tool is
    A. soluble oil B. kerosene C. turpentine oil D. compressed air

Answer - Option A
16. Anodizing is
    A. a zinc diffusion process B. an oxidizing process used for aluminium and magnesium articles C. a process used for making thin phosphate coating on steel to act as a base or primer for enamels and paints D. the process of coating of zinc by hot dipping

Answer - Option B
17. Best coolant and lubricant for steel and wrought iron is
    A. water soluble oil or sulphur -based and mineral oils B. mineral and fatty oils C. soluble oils D. dry

Answer - Option A
18. Crater wear occurs mainly due to
    A. abrasion B. diffusion C. oxidation D. adhesion

Answer - Option B
19. Chips with built up edge can be expected when machining
    A. hard material B. brittle material C. tough material D. ductile material

Answer - Option D
20. Crater wear takes place in a single point cutting tool at
    A. flank B. side rake C. face D. tip

Answer - Option A
21. Best coolant and lubricant for cast iron is
    A. water soluble oils or sulphur based and mineral oils B. mineral and oils C. soluble oils D. dry

Answer - Option D
22. Which of the following tool materials has highest cutting speed ?
    A. carbon steel B. tool steel C. HSS D. carbide

Answer - Option D
23. Main function of the cutting fluid is to
    A. provide lubrication B. cool the tool and work piece C. wash away the chips D. improve surface finish

Answer - Option B
24. Which of the following is used as cutting fluid for the turning and milling operation on alloy steels ?
    A. [latex]{CO}_{2}[/latex] B. kerosene C. soluble oil D. sulphurised mineral oil

Answer - Option D
25. Continuous chips will be formed when machining speed is
    A. high B. low C. medium D. irrespective of cutting speed

Answer - Option A
1. In hot working process
    A. grain structure of the metal is refined B. porosity of metal is largely eliminated C. mechanical properties such as ductility tougnes elongation and reduction in area are improved D. all of these

Answer - Option D
2. Process of increasing the cross-section of a bar and reducing its length is called
    A. spinning B. upsetting C. drawing down D. reaming

Answer - Option B
3. In hot working process
    A. poor surface finish is produced B. scale is formed on metal surface C. close tolerances can not be maintained D. all of these

Answer - Option D
4. Cold working
    A. requires much higher pressure than hot working B. increases hardness C. distort grain structure and does not provide an appreciable reduction in size D. all of these

Answer - Option D
5. Cold working of metal increases
    A. tensile strength B. hardness C. yield strength D. all of these

Answer - Option D
6. Cold working process can be applied on the components having diameter up to
    A. 12 mm B. 25 mm C. 49 mm D. 50 mm

Answer - Option B
7. Parts of circular cross section which are symmetrical about the axis of rotation are made by
    A. hot spinning B. hot forging C. hot extrustion D. hoth percing

Answer - Option A
8. Plastic deformation of metal at high temperature into a predetermined size or shape using compressive forces exerted through some type of die by a hammer a press or an upsetting machine, is called
    A. extrusion B. piercing C. forging D. casting

Answer - Option C
9. Forging of steel is done at a temperature of
    A. 400°C B. 800°C C. 1000°C D. 1300°C

Answer - Option C
10. Process used for making seamless tube is
    A. extrusion B. piercing C. forging D. casting

Answer - Option B
11. Process used for making nuts and bolts is
    A. extrusion B. cold peening C. hot piercing D. up setting

Answer - Option C
12. Process consists of pushing the metal inside a chamber to force it out by high pressure through an orifice, which is shaped to provide the desired form of the finished part, is called
    A. extrusion B. piercing C. forging D. swagging

Answer - Option A
13. Process used to improve fatigue resistance of the metal by setting up compressive stresses in its surface, is called
    A. extrusion B. pircing C. cold peening D. up setting

Answer - Option C
14. Process, in which the cross-sectional area of bars, rods or tubes in the desired area is reduced by repeated blows, is called
    A. extrusion B. piercing C. reaming D. swagging

Answer - Option D
15. Process of shaping thin metal sheets by processing them against a form is called
    A. spinning B. upsetting C. drawing down D. reaming

Answer - Option A
16. In rolling operations, the roll rotates with a surface velocity
    A. lower than the speed of incoming metal B. exceeding the speed of incoming metal. C. equal to speed of the incoming metal D. none of these

Answer - Option B
17. Hot press forging
    A. causes a steadily applied pressure instead of impact force B. is used to force the end of a heated bar into a desired shape C. is a forging operation in which two halves of a rotating die open and close rapidly while impacting the end of the heated tube or shell D. is a forging method for reducing the diameter of a bar and in the process making it longer

Answer - Option A
18. In hot working
    A. annealing operation is not necessary B. power requirements are low C. surface finish is good D. grain refinement is possible

Answer - Option D
19. Forging of plain carbon steel is carried out at
    A. 750°C B. 900°C C. 1100°C D. 1300°C

Answer - Option D
20. Swagging
    A. causes a steadily applied pressure instead of impact force B. is used to force the end of a heated bar into a desired shape C. is a forging operation in which two halves of a rotating die open and close rapidly while impacting the end of the heated tube or shell. D. is a forging method for reducing the diameter of a bar and in the process making it longer

Answer - Option D
21. Mechanical properties of the metal improve in hot working due to
    A. recovery of grains B. re - crystallization C. grain growth D. refinement of grain size

Answer - Option D
22. Roll forging
    A. causes a steadily applied pressure instead of impact force B. is used to force the end of a heated bar into a desired shape C. is a forging operation in which two halves of a rotating die open and close rapidly while impacting the end of the heated tube or shell D. is a forging method for reducing the making it longer

Answer - Option D
23. Production of contours in flat blank is called
    A. blanking B. piercing C. perforating D. punching

Answer - Option A
24. Upset forging
    A. causes a steadily applied pressure instead of impact force B. is used to force the end of a heated bar into a desired shape C. is a forging operation in which two halves of a rotating die open and close rapidly while impacting the end of the heated tube or shell D. is a forging method for reducing the diameter of a bar and in the process making it longer

Answer - Option B
25. In four high rolling mill the bigger rollers are called
    A. guide rolls B. back up rolls C. main rolls D. support rolls

Answer - Option B
1. A polished and etched surface of the cross-section of a hot worked product will be having
    A. fiber like structure B. grain field like structure C. carbon precipitated at boundaries D. carbon in the form of flakes

Answer - Option A
2. Notching is the operation of
    A. removal of excess metal from the edge of strip to make it suitable for drawing without wrinkling B. cutting of the excess metal at edge which was required for gripping purpose during press working operation C. cutting in a single line across a part of the metal strip to allow bending or forming in progressive die operation while the part remains attached to the strip D. punching in which punch is stopped as soon as the metal fracture is complete and metal is not removed but held in hole

Answer - Option A
3. Lancing is the operation of
    A. removal of excess metal from the edge of strip to make it suit able for drawing without wrinkling B. cutting of the excess metal at edge which was required for gripping purpose during press working operation C. cutting in a single line across a part of the metal strip to allow bending or forming in progressive die operation while the part remains attached to the strip D. punching in which punch is stopped as soon as the metal fracture is complete and metal is not removed but held in hole

Answer - Option C
4. Laser is produced by
    A. graphite B. ruby C. diamond D. emerald

Answer - Option B
5. Injection molding is the ideal method of processing
    A. plastics B. thermo-setting plastics C. thermoplastics D. nonferrous materials

Answer - Option B
6. Compression molding is the ideal method of processing
    A. plastics B. thermo-setting plastics C. thermoplastics D. nonferrous materials

Answer - Option C
7. Slugging is the operation of
    A. removal of excess metal from the edge of strip to make it suit able for drawing without wrinkling B. cutting of the excess metal at edge which was required for gripping purpose during press working operation C. cutting in a single line across a part of the metal strip to allow bending or forming in progressive die operation while the part remains attached to the strip D. punching in which punch is stopped as soon as the metal fracture is complete and metal is not removed but held in hole

Answer - Option D
8. In drawing operation the metal flows due to
    A. ductility B. work hardening C. plasticity D. shearing

Answer - Option C
9. Trimming is the operation of
    A. removal of excess metal from the edge of strip to make it suitable for drawing without wrinkling B. cutting of the excess metal at edge which was required for gripping purpose during press working operation C. cutting in a single line across a part of the metal strip to allow bending or forming in progressive die operation while the part remains attached to the strip D. punching in which punch is stopped as soon as the metal fracture is complete and metal is not removed but held in hole

Answer - Option B
10. Hemming is the operation
    A. in which the edges of sheet are turned over to provide stiffness and a smooth edge B. of producing contours in sheet metal end of bending previously roll formed sections C. in which a series of impact blows are transferred on dies so that solid or tubular work changes in cross section or geometric shape D. employed to expand a tubular or cylindrical part

Answer - Option A
11. Bulging is the operation
    A. in which the edges of sheet are turned over to provide stiffness and a smooth edge B. of producing contours in sheet metal end of bending previously roll formed sections C. in which a series of impact blows are transferred on dies so that solid or tubular work changes in cross section or geometric shape D. employed to expand a tubular or cylindrical part

Answer - Option D
12. Gear are shaping is related to
    A. template B. form tooth process C. hob D. generating

Answer - Option C
13. Gears best mass produced by
    A. milling B. hobbing C. shaping D. forming

Answer - Option B
14. Which of the following is a gear finishing operation ?
    A. Hobbing B. Shaping C. Milling D. Saving or burnishing

Answer - Option D
15. In press operation, the size of pierced hole is independent of the size of
    A. punch B. die C. average of punch and die D. punch and clearance

Answer - Option A
16. For drawing operation, the best suited press is
    A. knuckle joint press B. crank shaft and connecting rod press C. toggle press D. rack and pinion press

Answer - Option C
17. Swagging is the operation
    A. in which the edges of sheet are turned over to provide stiffness and a smooth edge B. of producing contours in sheet metal end of bending previously roll formed sections C. in which a series of impact blows are transferred on dies so that solid or tubular work changes in cross section or geometric shape D. employed to expand a tubular or cylindrical part

Answer - Option C
18. Blanking and piercing operation can be performed simultaneously in
    A. simple die B. progressive die C. compound die D. combination die

Answer - Option C
19. Cutting and forming operations can be done in single operation on
    A. simple die B. progressive die C. compound die D. combination die

Answer - Option D
20. Stretch forming is the operation
    A. in which the edges of sheet are turned over to provide stiffness and a smooth edge B. of producing contours in sheet metal end of bending previously roll formed sections C. in which a series of impact blows are transferred on dies so that solid or tubular work changes in cross section or geometric shape D. employed to expand a tubular or cylindrical part

Answer - Option B
21. In press operation, the size of the blanked part is dependent on the size of
    A. punch B. die C. average of punch and die D. die and clearance

Answer - Option B
22. A master gauge is used by
    A. masters B. experienced technician C. all machines D. none of these

Answer - Option C
23. Smallest thickness which can be measured by slip gauges is
    A. 0.001 mm B. 001 mm C. 1001 mm D. none of these

Answer - Option C
24. Which machine part is not cold formed ?
    A. Food container B. Stainless steel vessel C. Crank shaft D. Heating duct

Answer - Option C
25. Odd pair is
    A. Dimpling and flaring B. Welding and soldering C. Threading and boring D. Hobbing and swagging

Answer - Option D
1. Effect that is associated with cold forming is
    A. strain hardening B. shrinkage C. surface decolouring D. surface roughness

Answer - Option A
2. Close tolerance of dimensions is easily maintained in cold formed parts because
    A. dies are of exact dimension B. no shrinkage occurs C. strength increases D. higher deforming force is applied

Answer - Option B
3. If there are bad effects of strain hardening on a cold formed part, the part must be
    A. annealed B. tempered C. hardened D. normalized

Answer - Option A
4. Advantage of cold forming is
    A. grain refinement takes place B. strength and hardness increase C. no consequent heat treatment is needed D. force required is relatively small

Answer - Option B
5. Stretch forming is a process in which
    A. all deformations occur in the direction of stretch B. all forces are applied inthe direction of stretch C. advantage is taken of plastic state induced due to stretch D. no dies are used

Answer - Option C
6. Correct combination in a cold bending process is
    A. thicker metal, smaller bend angle, smaller bend radius B. harder metal, smaller bend angle, larger bend radius C. thinner metal, smaller bend angle larger bend radius D. thicker metal, larger bend angle, smaller bend radius

Answer - Option B
7. Vernier caliper is used to measure
    A. external and internal diameter of shafts B. thickness of parts C. depth of holes D. all of these

Answer - Option D
8. Bending process requires highest force is
    A. Bottom bending B. Three point bending C. Air bending D. none of these

Answer - Option A
9. Bottom of bend (tension side) does not make contact with the die in
    A. bottom bending B. air bending C. three point bending D. all of these

Answer - Option B
10. In which cold bending process, one set of punch and die can produce only one angle of bending ?
    A. Air bending B. Three point bending C. Bottom bending D. None of these

Answer - Option C
11. Flattening is a process in which a metal strip is
    A. bent over 18° and then pressed B. pressed to remove kinks and wrinkles C. bent to create a small kink D. pressed against rubber pad

Answer - Option A
12. In flexible press brake die
    A. any bend angle irrespective of punch is obtained B. good surface finish on tension side of bend is ensured C. smaller bending force is required D. none of these

Answer - Option B
13. Pre-bending is not possible in
    A. three roll single pinch machine B. three roll double pinch machine C. four roll double pinch machine D. pyramid machine

Answer - Option D
14. Rolling machine is amenable to NC CNC is
    A. pyramid machine B. three roll single pinch machine C. four roll double pinch machine D. three roll double pinch machine

Answer - Option C
15. Bar of section can be cold bent by
    A. roll bending B. rotating die and wiper block C. series of rolls D. matching shape wheels

Answer - Option B
16. Drawing process does not belong to the group is
    A. deep drawing B. stamping C. pressing D. shallow drawing

Answer - Option A
17. A cylindrical vessel with flat bottom can be deep drawn by
    A. single action deep drawing B. double action deep drawing C. triple action deep drawing D. shallow drawing

Answer - Option B
18. Ring rolling is used
    A. for producing a seamless tube B. to increase the thickness of a ring C. to decrease the thickness of a ring D. for producing large cylinder

Answer - Option C
19. In ring rolling
    A. inner roller is larger in diameter but outer roller is power driven B. outer roller is larger in diameter but inner roller is power driven C. both rollers are equal in diameter but inner roller is power driven D. larger outer roller is power driven

Answer - Option D
20. Cold or hot rolling does not produce
    A. a hollow circular section B. a T section C. an I section D. a channel section

Answer - Option A
21. Process of extrusion is like
    A. a viscous lubricant pouring through the mouth of container B. a tooth paste coming out of its tube C. hard particles thrown out of a nozzle under air pressure D. abrasive particle in the form of slurry coming out of an opening

Answer - Option A
22. A tooth paste tube can be produced by
    A. solid forward extrusion B. solid backward extrusion C. hollow backward extrusion D. hollow forward extrusion

Answer - Option B
23. Seamless tube can be produced by
    A. two high rolling mill B. ring rolling combined with stretch forming C. piercing D. steam hammer forging

Answer - Option A
24. Swagging is opposite of
    A. forging B. extrusion C. piercing D. none of these

Answer - Option B
25. Process producing grain structure with grains aligned along geometrical shape of crank shaft is
    A. casting B. rolling C. welding D. none of these

Answer - Option C
1. Process cannot be used for producing a crank shaft is
    A. casting B. rolling C. welding D. bending

Answer - Option B
2. A poppet value can be produced by
    A. rolling B. swagging C. combine forging and extrusion D. stretching

Answer - Option D
3. Needle is produced by
    A. swagging B. extrusion C. machining D. forging

Answer - Option A
4. Metal not good for impact extrusion is
    A. alloys of Zn and Sn B. stainless steel C. low carbon annealed steel D. alloys of aluminium and lead

Answer - Option B
5. Material good for extrusion is
    A. stainless steel B. brass casting C. low carbon annealed steel D. low carbon work hardened steel

Answer - Option C
6. In which forging machine anvil on which work piece is placed moves toward descending punch ?
    A. Board drop hammer B. Air lift hammer C. Trip hammer D. High energy rate forging machine

Answer - Option D
7. Upsetting or cold heading is a
    A. rolling process B. extruding process C. bending process D. forging process

Answer - Option D
8. For extrusion process
    A. complex sections are produced from bar stocks B. good surface finish and close tolerance is generated C. the strength of finished product is improved due to cold working D. all of these

Answer - Option D
9. Forming process which does not involve rotation of work piece is
    A. spinning B. thread rolling C. upsetting D. ring rolling

Answer - Option C
10. Different steps in Blocking, which is finishing operationin forging are in the following operation in forging are in the following order
    A. coining, trimming, planishing B. trimming, planishing, coining C. planishing, coining, trimming D. planishing, trimming, coining

Answer - Option B
11. The operation that removes fins and flashes from a forged part is
    A. combination of trimming, planishing and coining B. combination of trimming and planishing C. combination of planishing and coining D. trimming

Answer - Option D
12. A hack saw blade cut on
    A. forward stroke B. return stroke C. both (a) and (b) D. depends upon direction of forces

Answer - Option A
13. The forge hammers used for planishing and coining are
    A. Air lift hammers B. Helve and trip hammers C. Board drop hammers D. Steam hammers

Answer - Option B
<strong14. The major problem in hot extrusion is
    A. design of punch B. design of die C. wear and tear of die D. wear of punch

Answer - Option C
15. Extension process can effectively reduce the cost of product through
    A. material saving B. process in tooling cost C. saving in tooling cost D. saving in administrative cost

Answer - Option A
16. In a solid extrusion die, purpose of knock out pin is
    A. shopping the part to extrude through the hose B. ejecting the part after extrusion C. allowing the job to have better surface finish D. reducing the waste of material

Answer - Option B
17. Width of slot cut by a hacksaw blade as compared to width of blade is
    A. more B. less C. equal D. none of these

Answer - Option A
18. Length of hacksaw blade is measured from
    A. center of hole at one end to the center of hole at the other end B. extreme end to extreme end C. 16 times the width D. none of these

Answer - Option B
19. Hacksaw blade is specified by its
    A. width B. length C. material D. number of teeth

Answer - Option B
20. Hacksaw blade preferred for cutting brass have number of teeth
    A. 14 per inch B. 25 per inch C. 32 per inch D. 40 per inch

Answer - Option A
21. Teeth of hacksaw blades are bend
    A. alternately right or left and every third or fourth left straight B. towards right C. towards left D. none of these

Answer - Option A
22. A file with 20 teeth per inch is known as
    A. rough file B. smooth file C. bastard file D. second cut file

Answer - Option A
23. A file removes metal during its
    A. forward stroke B. return stroke C. both (a) and (b) D. none of these

Answer - Option A
24. File used for wood work is
    A. single cut file B. double cut file C. rasp cut file D. none of these

Answer - Option C
25. Slip gauges are made of
    A. cast iron B. aluminium C. alloy steel D. copper

Answer - Option C
1. When file is moved to and fro over the work it is called
    A. draw filing B. cross filing C. pull nd push filing D. none of these

Answer - Option A
2. Scribing block is used to
    A. locate the center of round bars B. check the trueness of flat surfaces C. check the accuracy of a limit gauge D. check the diameter of shafts or studs

Answer - Option A
3. Surface plate is used to
    A. locate the center of roung bars B. check the trueness of flat surfaces C. check the accuracy of a limit gauge D. check the diameter of shafts or studs

Answer - Option B
4. Slip gauge is used to
    A. locate the center of round bars B. check the trueness of flat surfaces C. check the accuracy of a limit gauge D. check the diameter of shafts or studs

Answer - Option C
5. Chisels used for metal cutting are
    A. hardened B. annealed C. tempered D. all of these

Answer - Option D
6. A single V and single U-butt welds are for sheets of approximate thickness
    A. 1 to 5 mm B. 5 to 15 mm C. 15 to 25 mm D. more that 25 mm

Answer - Option B
7. For welding plates of thickness less than 5 mm, beveling of its edges is
    A. done to a singe V or U-groove B. done to a double V or U-groove on one side C. done to a double V or U-groove on both sides D. not required

Answer - Option D
8. For welding plates of thickness more than 12.5 mm, beveling of its edges is
    A. done to a singe V or U-groove B. done to a double V or U-groove on one side C. done to a double V or U-groove on both sides D. not required

Answer - Option C
9. In single V-butt welds, the angle between edges is kept about
    A. 40° to 50° B. 50° to 60° C. 60° to 70° D. 70° to 90°

Answer - Option D
10. In a welding a flux is used to
    A. permit perfect cohesion of metals B. remove the oxides of the metals formed at high temperature C. both (a) and (c) D. none of these

Answer - Option C
11. Plain and butt welds can be used for sheet shaving thickness approximately
    A. 25 mm B. 40 mm C. 50 mm D. 100 mm

Answer - Option A
12. In electrical resistance welding, cleaning of metals to be welded is
    A. immaterial B. important C. not effecting the welding D. none of these

Answer - Option B
13. In electrical resistance welding, when the current passes through the metal, the greatest resistance is at the
    A. surface B. point of contact of electrode and metal C. point of contact of metals to be welded D. none of these

Answer - Option C
14. Welding of chromium molybdenum steels cannot use
    A. thermit welding B. electrical resistance welding C. oxyacetylene welding D. all of these

Answer - Option D
15. In electrical resistance welding
    A. voltage is high and current is low B. voltage is low and current is high C. both voltage and current are high D. both voltage and current are low

Answer - Option D
16. In electrical resistance welding voltage, required for heating is in the range
    A. 1 to 5 volts B. 6 to 10 volts C. 11 to 15 volts D. 16 to 20 volts

Answer - Option B
17. In electrical resistance welding, pressure applied varies in the range
    A. 50 to 100 [latex]\frac{kgf}{{cm}^{2}}[/latex] B. 100 to 200 [latex]\frac{kgf}{{cm}^{2}}[/latex] C. 250 to 550 [latex]\frac{kgf}{{cm}^{2}}[/latex] D. 600 to 900 [latex]\frac{kgf}{{cm}^{2}}[/latex]

Answer - Option C
18. In electric resistance welding, two copper electrodes used are cooled by
    A. water B. air C. both (a) and (b) D. none of these

Answer - Option A
19. Amount of current required in electric resistance welding is regulated by changing
    A. input supply B. primary turns of the transformer C. secondary turns of the transformer D. all of these

Answer - Option B
20. Welding in which the metals to be joined are heated to a molten state and allowed to solidify in presence of a filler material, is called
    A. plastic welding B. fusion welding C. thermit welding D. none of these

Answer - Option B
21. An example of fusion welding is
    A. arc welding B. gas welding C. thermit welding D. forge welding

Answer - Option B
22. Welding in which metals to be joined are heated to the plastic state and then forged together by external pressure without the addition to filler material, is called
    A. plastic welding B. fusion welding C. thermit welding D. none of these

Answer - Option A
23. An example of plastic welding is
    A. arc welding B. gas welding C. forge welding D. all of these

Answer - Option C
24. Spot -welding, projection welding and seam welding are classification of
    A. electric resistance welding B. thermit welding C. arc welding D. forge welding

Answer - Option A
25. Welding process in which two pieces to be joined are overlapped and placed between two electrodes, is called
    A. spot welding B. projection welding C. seam welding D. butt welding

Answer - Option A
1. Spot welding is used for welding top joints in plates having thickness
    A. 0.25 mm to 1.25 mm B. 1.25 mm to 2.50 mm C. 2.5 mm to 3 mm D. more than 3 mm

Answer - Option A
2. Material difficult to be spot welded is
    A. stainless steel B. copper C. mild steel sheet D. all of these

Answer - Option B
3. Number of zones of heat generation in spot welding are
    A. 2 B. 3 C. 5 D. 8

Answer - Option C
4. In spot welding, the tip of electrodes is of
    A. stainless steel B. aluminium C. copper D. brass

Answer - Option C
5. In spot welding, spacing between two spot welds should not be less than
    A. d B. 15 d C. 3 d D. 45 d
where d is electrode tip diameter
Answer - Option C
6. In spot welding, the electrode tip diameter (d) should be equal to
    A. [latex]\sqrt{t}[/latex] B. 15 t C. 3 t D. 45 t

Answer - Option A
7. Multi spot welding process is
    A. seam welding B. projection welding C. thermit welding D. percussion welding

Answer - Option B
8. A continuous spot welding process is
    A. seam welding B. projection welding C. thermit welding D. percussion welding

Answer - Option A
9. If two pieces of different metals are to be welded by projection welding, then projection should be made on the metal piece having
    A. higher conductivity B. lower conductivity C. same conductivity D. none of these

Answer - Option A
10. Welding process used for joining round bars is
    A. spot welding B. projection welding C. seam welding D. none of these

Answer - Option C
11. Seam welding used for metal sheets having thickness in the range
    A. 0.025 to 3 mm B. 3 to 6 mm C. 6 to 10 mm D. more than 10 mm

Answer - Option A
12. In projection welding, diameter of the projection as compared to thickness of the sheet is approximately
    A. half B. equal C. 1.5 times D. double

Answer - Option B
13. Welding of steel structures on site of a building is done by
    A. spot welding B. projection welding C. seam welding D. arc welding

Answer - Option D
14. In arc welding, electric arc is produced between the work and the electrode by
    A. current flow B. voltage difference C. contact resistance D. all of these

Answer - Option C
15. In arc welding, temperature of heat of arc is in the range
    A. 1000°C to 2000°C B. 2000°C to 4000°C C. 4000°C to 6000°C D. 6000°C to 7000°C

Answer - Option C
16. In arc welding, current used is
    A. A.C. current of high frequency B. A.C. current of low frequency C. D. C. current D. all of these

Answer - Option D
17. In arc welding, with increase of thickness of material to be welded, the welding current requirement
    A. increases B. decreases C. remains same D. none of these

Answer - Option A
18. In arc welding, too low welding speed results in
    A. wastage of electrode B. excessive pilling up of weld metal C. overhauling without penetration edges D. all of these

Answer - Option D
19. Welding preferred for joining thin foils is
    A. gas welding B. x-rays and gamma rays C. micro waves D. all of these

Answer - Option C
20. Transfer of metal from the electrode occurs due to molecular attraction in
    A. gas welding B. D.C. arc welding C. metallic welding D. thermit welding

Answer - Option C
21. Welding process using a pool of molten metal is
    A. carbon arc welding B. submerged arc welding C. TIC welding D. MIG welding

Answer - Option B
22. Welding process in which flux is used in the form of granules is
    A. gas welding B. D.C. arc welding C. submerged arc welding D. thermit welding

Answer - Option C
23. An arc is produced between a bare metal electrode and the work in
    A. gas welding B. D.C. arc welding C. submerged arc welding D. thermit welding

Answer - Option C
24. Welded rod coated with fluxing material is used in
    A. gas welding B. shielded arc welding C. D.C arc welding D. argon arc welding

Answer - Option B
25. In arc welding, eyes need to be protected against
    A. intense glare B. sparks C. infra-red rays D. infra-red and ultra violet rays.

Answer - Option D
1. Brazing metals and alloy commonly used are
    A. copper B. copper alloy C. silver alloys D. all of these

Answer - Option D
2. Forge welding is best suited for
    A. stainless steel B. high carbon steel C. cast iron D. wrought iron

Answer - Option D
3. Two sheets of different materials but same thickness can be spot welded by
    A. adjusting the current B. time duration of current C. adjusting the pressure applied D. changing the size of neelectrode

Answer - Option D
4. Welding process, in which electrode is not consumed is
    A. tungsten-inert gas (TIG) welding B. MIG welding C. DC arc welding D. argon arc welding

Answer - Option A
5. A non-consumable electrode is used in
    A. gas welding B. DC welding C. AC arc welding D. argon arc welding

Answer - Option D
6. A consumable electrode is used in
    A. TIG welding B. MIG welding C. submerged arc welding D. carbon arc welding

Answer - Option B
7. Voltage drop across the arc between the two electrodes known as arc voltage, increases as the arc length
    A. increases B. decreases C. remains same D. none of these

Answer - Option A
8. In arc welding using direct current, amount of useful arc heat at the anode and cat hode respectively are
    A. one third and two third B. two third and one third C. equal D. none of these

Answer - Option B
9. In arc welding using A.C. amount of useful heat at the anode and cathode respectively are
    A. one third and two third B. two third and one third C. equal D. none of these

Answer - Option C
10. In TIG arc welding, the welding zone is shielded by an atmosphere of
    A. helium gas B. argon gas C. either (a) or (b) D. none of these

Answer - Option C
11. TIG welding is preferred for
    A. mild steel B. aluminium C. silver D. all of these

Answer - Option B
12. Welding process preferred for cutting and welding for non-ferrous metals is
    A. inert gas arc welding B. MIG welding C. submerged arc welding D. D.C. arc welding

Answer - Option A
13. When the work is connected to the negative terminal and the electrode holder to the positive terminal, the welding set up is said to have
    A. straight polarity B. reversed polarity C. both (a) and (b) D. none of these

Answer - Option B
14. When the work is connect ed to the positive terminal and the electrode holder to the negative terminal, the welding set up is said to have
    A. straight polarity B. reversed polarity C. both (a) or (b D. none of these

Answer - Option A
15. In welding copper alloys with TIG arc welding
    A. direct current with reverse polarity (DCRP) is used B. direct current with straight polarity (DCSP) is used C. AC is used D. all of these

Answer - Option B
16. In welding magnesium with TIG arc welding
    A. direct current with reverse polarity (DCRP) is used B. direct current with straight polarity (DCSP) is used C. AC is used D. all of these

Answer - Option A
17. In welding aluminium with TIG are welding
    A. direct current with reverse polarity (DCRP) is used B. direct current with straight polarity (DCSP) is used C. AC is used D. all of these

Answer - Option C
18. In arc welding, penetration is deeper for
    A. DCRP B. DCSP C. AC D. none of these

Answer - Option B
19. In arc welding, penetration is minimum for
    A. DCRP B. DCSP C. AC D. none of these

Answer - Option A
20. Welding process, in which heat is produced for welding by chemical reaction is called
    A. gas welding B. thermit welding C. forge welding D. resistance welding

Answer - Option B
21. Molten metal is poured for joining the metals in
    A. arc welding B. thermit welding C. gas welding D. TIG welding

Answer - Option B
22. In thermit welding, heat is generated from
    A. chemical reaction involving finely divided aluminium and iron oxide B. combustion of gases C. electric arc D. none of these

Answer - Option A
23. In thermit welding, thermit used is mixture of
    A. aluminium and iron oxide B. aluminium and charcoal C. iron oxide and charcoal D. none of these

Answer - Option A
24. In thermit welding, aluminium and iron oxide are mixed in the proportion
    A. 1 : 1 B. 1 : 3 C. 3 : 1 D. 2 : 1

Answer - Option B
25. Thermit welding is used for
    A. joining rails, truck frames and broken motor castings B. repairing broken shears C. replacing broken gear teeth D. all of these

Answer - Option D
1. In thermit welding
    A. weld cools uniformly B. all part of the weld section are molten at the same time C. problem with internal residual stresses is minimum D. all of these

Answer - Option D
2. Welding process which employs exothermal chemical reaction for developing high temperature is
    A. thermit welding B. gas welding C. arc welding D. resistance welding

Answer - Option A
3. Gray iron is generally welded by
    A. gas welding B. arc welding C. TIG welding D. MIG welding

Answer - Option A
4. I n gas welding, maximum flame temperature occurs at
    A. inner cone B. outer cone C. next of inner cone D. tip of the flame

Answer - Option A
5. In gas welding, flame temperature of the oxyacetylene gas used is
    A. 1200°C B. 1800°C C. 2400°C D. 3200°C

Answer - Option D
6. Acetylene gas is stored in cylinders in
    A. solid form B. liquid form C. gaseous form D. all of these

Answer - Option B
7. Chemical used in producing acet-ylene gas is
    A. carbon B. crushed bone C. charcoal D. all of these

Answer - Option B
8. Low pressure acetylene is produced at the welding site by chemical reaction between water and
    A. calcium chloride B. calcium carbide C. calcium carbonate D. carbon

Answer - Option A
9. In gas welding, maximum thickness of material which can be welded with a 30 mm diameter welding rod is
    A. 3 mm B. 6 mm C. 15 mm D. 300 mm

Answer - Option A
10. Filler material is essentially used in
    A. gas welding B. spot welding C. seam welding D. all of these

Answer - Option A
11. Generally the oxy-acetylene welding is done with
    A. neutral flame B. oxidizing flame C. carburising D. all of these

Answer - Option A
12. Neutral flame is obtained by sup-plying
    A. equal volumes of oxygen and acetylene B. more volume of acetylene and less volume of oxygen C. more volume of oxygen and less volume of acetylene D. none of these

Answer - Option A
13. Oxidizing flame is obtained by supplying
    A. equal volumes of oxygen and acetylene B. more volume of acetylene and less volume of oxygen C. more volume of oxygen and less volume of acetylene D. none of these

Answer - Option C
14. Carburising flame is obtained by supplying
    A. equal volumes of oxygen and acetylene B. more volume of acetylene and less volume of oxygen C. more volume of oxygen and less volume of acetylene D. none of these

Answer - Option B
15. Oxidizing flame as compared to neutral flame has inner core
    A. less luminous B. shorter C. more luminous D. both (a) and (b)

Answer - Option D
16. Neutral flame is used to weld
    A. copper or brass B. cast iron C. steel D. all of these

Answer - Option D
17. Rate of welding steel by carburising flame as compared to neutral flame is
    A. more B. less C. same D. none of these

Answer - Option A
18. Oxidizing flame is used to weld
    A. brass B. copper C. bronze D. all of these

Answer - Option D
19. Carburising flame is used to weld
    A. steel, cast iron, copper etc. B. brass and bronze/c C. hard surfacing materials such as satellite D. all of these

Answer - Option C
20. Ratio of oxygen to acetylene for complete combustion is
    A. 1 : 1 B. 15 : 1 C. 2 : 1 D. 25 : 1

Answer - Option D
21. In gas welding using oxygen and acetylene cylinders, pressure of gas is more in
    A. acetylene cylinder B. oxygen cylinder C. equal in both the cylinders D. none of these

Answer - Option B
22. Temperature of oxy-hydrogen flame as compared to oxy-acetylene flame is
    A. more B. less C. same D. none of these

Answer - Option A
23. Ends of two pipes of uniform cross-section are welded by
    A. spot welding B. seam welding C. projection welding D. upset butt welding

Answer - Option D
24. The name key hole welding refers to
    A. Projection welding B. Percussion welding C. Pulsed TIG welding D. Plasma arc welding

Answer - Option A
25. Black colour is generally painted on
    A. oxygen cylinder B. acetylene cylinder C. hydrogen cylinder D. none of these

Answer - Option A
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