Fluid Mechanics Hydraulic Machinery 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 in India. In this article, candidates can find different types of questions with solutions related to the Fluid Mechanics and Hydraulic Machinery topic. The article Fluid Mechanics Hydraulic Machinery Quiz, will assist the students in understanding the type of questions expected from the topic Fluid Mechanics and Hydraulic Machinery.
Answer – Option D
2. Centre of buoyancy is
Answer – Option C
3. Length of mercury column at a place at an altitude will vary with respect to that at ground in a
Answer – Option D
4. When power is transmitted through a considerable distance by means of water under pressure,
the maximum power is transmitted when frictional loss of head is
C. 10% of the total head
D. 17.7% of the total head.
Answer – Option A
5. A rota-meter is a device used to measure
Answer – Option D
6. Reynolds number for pipe flow is given by
Answer – Option C
7. With rise in gas temperature, dynamic viscosity of most of the gases
Answer – Option A
8. The flow of water in a pipe of diameter 3000 mm can be measured by
Answer – Option C
9. Which of the following is dimensionless parameter ?
Answer – Option D
10. A small plastic boat loaded with pieces of steel rods is floating in a bath tub. If the cargo is dumped into the water allowing the boat to float empty, the water level in the tub will
Answer – Option B
11. Steady flow occurs when
Answer – Option D
12. A flow in which each liquid particle has a definite path and their paths do not cross each other, is called
Answer – Option C
13. Buoyant force is
Answer – Option D
14. In a rectangular notch, the ratio of percentage error in \(\frac{discharge}{measurement of head}\) is
Answer – Option D
15. Cavitation is caused by
Answer – Option D
16. If the particles of a fluid attain such velocities that vary from point to point in magnitude and direction as well as from instant, the flow is
Answer – Option C
17. In a turbulent flow in a pipe
Answer – Option D
18. The friction resistance in pipe is proportional to \({V}^{2}\), according to
Answer – Option A
19. In laminar flow, maximum velocity at the centre of pipe is how many times to the average velocity ?
Answer – Option A
20. Pitot tube is used to measure the velocity head of
Answer – Option D
Answer – Option C
2. Flow occurring in a pipeline when a valve is being opened is
Answer – Option B
3. Total pressure on 1 m * 1 m gate immersed vertically at a depth of 2 m below the free water surface will be
Answer – Option A
4. The general equation of continuity for three dimensional flow of a compressible fluid for steady flow is
where u, v and w are components of velocity in x, y and z directions respectively
Answer – Option A
5. A large Reynolds number is indication of
Answer – Option D
6. Non uniform flow occurs when
Answer – Option D
7. In steady flow of a fluid, the acceleration of any fluid particle is
Answer – Option C
8. For measuring flow by a venturimeter, it should be installed in
Answer – Option D
9. Fronde number is significant in
Answer – Option C
10. The fluid forces considered in the Navier Stokes equation are
D. gravity, viscous and turbulent
Answer – Option A
11. The depth of centre of pressure in rectangular lamina of height h with one side in the liquid
surface is at
Answer – Option C
12. Reynolds number is significant in
Answer – Option B
13. Two dimensional flow occurs when the
Answer – Option D
14. A streamline is defined as the line
Answer – Option C
15. Match number is significant in
Answer – Option A
16. For an irrotational flow the equation \(\frac{{∂}^{2}\phi}{∂{x}^{2}} + \frac{{∂}^{2}\phi}{∂{y}^{2}}\) is called
Answer – Option D
17. Separation of flow occurs due to reduction of pressure gradient to
Answer – Option C
18. The magnitude of water hammer depends on the
Answer – Option D
19. A cylinder is kept on a horizontal boundary past which an ideal fluid flows perpendicular to the cylinder axis. It will experience
Answer – Option A
20. When the water flows over a rectangular suppressed weir, the pressure beneath the
nappe is
Answer – Option D
Answer – Option A
2. For supplying feed water to a boiler which of the following pump is not used ?
Answer – Option D
Explanation –
Boiler feed pump has to supply water at higher pressures– more than the pressure of steam. Gear pumps are never used for such services.
3. In hydraulic coupling, as the ratio of the speed driven shaft to driving shaft increases, the efficiency
Answer – Option B
4. Pump selected for pumping sewage is
Answer – Option B
5. In a centrifugal pump when delivery valve is fully closed, the pressure of fluid inside the pump will
Answer – Option D
6. Undershot water wheels are those on which water acts
Answer – Option A
7. In the case of pelton turbine installed in a hydraulic power plant, the gross head available is
the vertical distance between
Answer – Option B
8. A hydraulic coupling belongs to the category of
Answer – Option D
Explanation –
A hydraulic coupling consists of a pump unit fitted on the driving shaft and a turbine unit on to the driven shaft. These two units are housed in a common casing in such a manner that output of the pump is fed to the turbine unit which rotates and drives the driven shaft. The medium fluid used is generally oil.
9. For pumping molasses, it is preferable to employ
Answer – Option C
Explanation –
Molasses is highly viscous therefore open impeller should be used. Normally a screw pump is used for pumping highly viscous fluids.
10. In the case of a centrifugal pump, cavitation will occur if
Answer – Option D
11.The hydraulic radius is given by
Answer – Option D
12.Specific speed (metric) = k × specific (FPS), where k has the value of
Answer – Option D
13. The cavitation and pitting can be prevented by creating which one of the following conditions?
Answer – Option D
14.Pressure rise due to water hammer in a pen-stock depends on
Answer – Option D
15.A pumped storage plant is a
Answer – Option A
16.Which of the following statements about gear pumps are true?
Answer – Option B
17. In the figure below, which curve represents the condition for backward curved vanes in a
centrifugal pump?
Answer – Option C
18.In all reaction turbines, maximum efficiency is obtained, if
Answer – Option D
Explanation –
In case of reaction turbines, maximum efficiency is obtained when absolute velocity vector at the
outlet is 90°
19. The shut off head will be nearly
Answer – Option D
Explanation –
By extrapolating Q vs H curve, the shut off head which is corresponding to Q = 0 is 35.5 m.
20.Double hemispherical buckets are used in
Answer – Option D
Explanation –
Buckets are double hemispherical in shape. These buckets are made of cast iron, bronze or stainless
steel.
Answer – Option B
Explanation –
A reciprocating pump is self priming. It operates at low speeds. It is not suitable for viscous liquids, paper pulp, molasses, etc.
2. Air vessel in a reciprocating pump is used to
Answer – Option A
Explanation –
Air vessel smooth-ens water discharge which is otherwise pulsating. Air vessel may be fitted on suction side and/or delivery side.
3. A tapered draft tube as compared to a cylindrical draft tube
Answer – Option C
Explanation –
A tapered draft tube is used for low specific speed vertical shaft turbines. Its maximum cone angle
is 8°. If angle is more than this, water does not touch the inner walls, causing vertices and loss of head. Maximum efficiency obtained in this tube is 9%. The tube must discharge sufficiently below the tail water level.
4. The specific speeds of radial vane pump, mixed flow pump and axial flow pump are \({NS}_{1}\), \({NS}_{2}\) and \({NS}_{3}\) respectively. Then
Answer – Option B
5. Centrifugal pumps operating in series will result in
Answer – Option C
Explanation –
Series operation is achieved by having one pump discharge into he suction of the next . This
arrangement is used primarily to increase the discharge head.
6.Jet pumps are often used in process industry for their
Answer – Option B, D
7.Spouting velocity is
Answer – Option A
8. The comparison between pumps operating in series and in parallel is
Answer – Option B
9.A pelton turbine is considered suitable for which of the following head ?
Answer – Option D
Explanation –
By extrapolating Q vs H curve, the shut off head which is corresponding to Q = 0 is 35.5 m.
10.Material for water turbine should have
Answer – Option C
11. The coefficient of discharge ( \({C}_{D}\)) of an orifice varies with
Answer – Option A
12. The shear stress distribution for a fluid flowing in between the parallel plates, both at rest, is
Answer – Option C
13. Friction drag is generally larger than the pressure drag in
Answer – Option B
14. Capillarity is due to
Answer – Option C
15. Principle of similitude forms the basis of
Answer – Option B
16. If V is the mean velocity of flow, then according to Darcy-Weisbach equation for pipe flow, energy loss over a length of pipe is proportional
Answer – Option B
17. Head loss in turbulent flow in a pipe
Answer – Option D
18. The horizontal component of force on a curved surface is equal to the
Answer – Option C
19. Total pressure on the top of a closed cylindrical vessel of radius r filled with liquid is
proportional to
Answer – Option D
20. The drag coefficient for laminar flow varies as (where Re = Reynolds number)
Answer – Option D
Answer – Option A
2. In series-pipe applications
Answer – Option D
3. For pipe flow, at constant diameter, capacity is proportional to
Answer – Option C
4. The velocity distribution for flow between two fixed parallel plates
Answer – Option A
5. The most economical section of a rectangular channel for maximum discharge is obtained when
its depth is equal to
Answer – Option C
6. Region downstream from the streamline where separation takes place from the boundary is
known as
Answer – Option D
7. A low pressure of the order of \({10}^{-10}\) torr can be measured in a chamber with
Answer – Option A
8. To avoid a correction for the effect of capillarity in manometers, diameter of tube should be
Answer – Option D
9. The river flow during floods can be classified as
Answer – Option D
10. Wake always occurs
Answer – Option B
11. In a flow field, at the stagnation point
Answer – Option B
12. Total drag on a body is the sum of
Answer – Option C
13. Specific speed of a pump and specific speed of a turbine are (symbols have the usual meaning)
Answer – Option A
14. One horse power is equal to
Answer – Option D
15. Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of
Answer – Option A
16. The maximum continuous power available from a hydroelectric plant under most adverse
hydraulic conditions, is called
Answer – Option B
17. The movable wicket gates of a reaction turbine are used to
Answer – Option B
18. A Fourneyron turbine is
Answer – Option A
19. The degree of reaction of a turbine is defined as the ratio of
Answer – Option A
20. In a centrifugal pump installation while starting, the position of delivery valve is
Answer – Option B
Answer – Option A
2. Which one of the following statements regarding reciprocating pumps is correct ?
Answer – Option C
3. On an immersed body in a flowing fluid the lift force is
Answer – Option B
4. A plot between power generated in MW and time is known as
Answer – Option A
5. A centrifugal pump takes too much power, due to
Answer – Option B
6. In reaction turbine the draft tube is used to
Answer – Option B
7. A drum of radius R full of a fluid of density d is rotated at \(\omega\) rad/sec. The increase in pressure at the outer edge of the drum will be
Answer – Option A
8. In axial flow turbines, water enters
Answer – Option A
9. When pressure p, flow rate Q, diameter D, and density d, a dimensionless group is represented by
Answer – Option A
10. Viscosity is the most important property in the
Answer – Option C
11. A type of flow in which the fluid particles while moving in the direction of flow rotate about their mass centre, is known as
Answer – Option C
12. If pressure at any point in the liquid approaches the vapor pressure, liquid starts vaporizing and creates pockets or bubbles of dissolved gases and vapors. This phenomenon is
Answer – Option A
13. Fire hose nozzle is generally made of
Answer – Option C
14. Discharge of broad crested weir is maximum in the head of water on downstream side of weir as compared to head on the upstream side of the weir is
Answer – Option D
15. For small discharge at high pressure, pump preferred is
Answer – Option D
16. Discharge over a sharp-edged rectangular notch of width w and depth h is equal to
Answer – Option C
17. In a free vortex motion, tangential velocity of the water particles is proportional to
where, r = distance from the centre.
Answer – Option C
18. To replace a pipe of diameter D by n parallel pipes of diameter d, the formula used is
Answer – Option D
19. Vertical component of pressure force on a submerged curve surface is equal to
Answer – Option A
20. The fluid forces considered in the Navier-Stokes equation are
Answer – Option A
21. For a flow to be rotational, velocity normal to the plane of area should be equal to the
Answer – Option C
22. Continuity equation for an in compressible fluid is
where V = velocity, \(\rho\)= density and A = area
Answer – Option A
23. Loss of head due to friction in a pipe of uniform diameter with viscous flow is equal to
Answer – Option D
24. Hydraulic grade line for any flow system as compared to energy line is
Answer – Option B
25. The effect of negative pressure beneath the nappe in case of flow of wat er over a r ect angular suppressed weir is to
Answer – Option B
Answer – Option B
2. A fluid in which resistance to deformation is independent of the shear stress, is known as
Answer – Option D
3. Pressure drag results from
Answer – Option D
4. Turbulent flow is hydraulically smooth if ratio \(\frac{height of roughness projection}{thickness of laminar sub – layer}\) is less than
Answer – Option D
5. Bluff body surface
Answer – Option C
6. Centre of pressure on an inclined plane is
Answer – Option C
7. Separation of flow occurs when pressure gradient
Answer – Option C
8. The friction head lost due to flow of a viscous fluids through a circular pipe of length L and diameter d with a velocity v, and pipe friction factor ‘f’ is
Answer – Option A
9. The rate of change of linear momentum is equals to
Answer – Option C
10. Component of the force of fluid on the body (which is generally inclined to the direction of motion of the body) parallel to the direction of motion is called
Answer – Option A
11. Energy loss in flow through nozzle as compared to venturimeter is
Answer – Option A
12. The rate of change of moment of momentum represents the
Answer – Option B
13. If the characteristics of a pump are as shown in the figure, then abscissa represents
Answer – Option C
14. To obtain relation for the specific speed, the assumption made is that all pumps
Answer – Option C
15. Water turbines may be put in the decreasing order of specific speed as
Answer – Option A
16. Mixed flow turbines are
Answer – Option C
17. A foot valve is provided on
Answer – Option A
18. Which one is different from the others ?
Answer – Option D
19. In a reaction turbine
Answer – Option D
20. The discharge through a rectangular weir varies as
Answer – Option D
21. The hydraulic gradient line is always
Answer – Option A
22. In in-volute casing the velocity of water
Answer – Option A
23. The pump which is different from others is
Answer – Option D
24. If a centrifugal pump is noisy in operation, it may be due to
Answer – Option D
25. Francis turbine is best suited for
Answer – Option A
Answer – Option C
2. Run away speed of a hydraulic turbine is the speed
Answer – Option C
3. According to the laws of proportionality for homologous turbines, speed is proportional to
Answer – Option A
4. A hydraulic intensifier normally consists of
Answer – Option C
5. According to the laws of proportionality for homologous turbines, discharge is proportional to
Answer – Option B
6. Any change in load is adjusted by adjusting on turbine
Answer – Option D
7. For pumping viscous oil, pump used will be
Answer – Option D
8. The cavitation in reaction type hydraulic turbines is avoided by
Answer – Option D
9. Propeller turbine is best suited for
Answer – Option B
10. A hydraulic jump can occur under all of the following conditions except :
Answer – Option A
11. As per the aerofoil theory of Kaplan turbine blade design, guide angle is as the angle between
Answer – Option A
12. Power required to drive a centrifugal pump is proportional to (D = impeller diameter)
Answer – Option D
13. Ratio of maximum load to rated plant capacity is known as
Answer – Option B
14. A double acting reciprocating pump compared to single acting pump will have nearly
Answer – Option C
15. For centrifugal pump
Answer – Option A