Multiple Choice Questions on Fluid MechanicsThe Following Section consists of Multiple Choice Questions on Fluid Mechanics.
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Fluid Mechanics MCQ
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Question 1 of 20
1. Question
1 pointsThe fluid property, due to which, mercury does not wet the glass is
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Question 2 of 20
2. Question
1 pointsLaminar flow of a Newtonion fluid ceases to exist, when the Reynolds number exceeds
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Question 3 of 20
3. Question
1 pointsWhen the momentum of one fluid is used for moving another fluid, such a device is called a/an
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Question 4 of 20
4. Question
1 pointsMost commonly used joint in the underground pipe lines is the
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Question 5 of 20
5. Question
1 pointsSchedule number of a pipe, which is a measure of its wall thickness, is given by
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Question 6 of 20
6. Question
1 pointsThe net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the
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Question 7 of 20
7. Question
1 pointsWith increasing flow rate, the hydraulic efficiency of a centrifugal pump
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Question 8 of 20
8. Question
1 pointsThe velocity profile for turbulent flow through a closed conduit is
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Question 9 of 20
9. Question
1 pointsWater hammer in a pipeline results from the
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Question 10 of 20
10. Question
1 pointsMolten soap mass is transported by a __________ pump.
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Question 11 of 20
11. Question
1 pointsWhich of the following denotes the effect of compressibility in fluid flow ?
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Question 12 of 20
12. Question
1 pointsNominal size of the discharge pipe of a pump is usually __________ the nominal size of the inlet pipe.
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Question 13 of 20
13. Question
1 pointsThe terminal velocity of a small sphere settling in a viscous fluid varies as the
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Question 14 of 20
14. Question
1 pointsIf the discharge of a centrifugal pump is throttled, then its suction lift
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Question 15 of 20
15. Question
1 pointsFoot valves provided in pumps are __________ valves.
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Question 16 of 20
16. Question
1 pointsAt high Reynolds number
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Question 17 of 20
17. Question
1 pointsPower loss in an orificemeter is __________ that in a venturimeter.
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Question 18 of 20
18. Question
1 pointsThe terminal velocity of a particle moving through a fluid varies as dpn. What is the value of n’ for Newton’s law regime ?
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Question 19 of 20
19. Question
1 pointsWhat is the normal range of exit cone angle of a venturimeter ?
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Question 20 of 20
20. Question
1 pointsThe fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a __________ fluid.
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Fluid Mechanics MCQ 2
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Question 1 of 20
1. Question
1 pointsThe ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is
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Question 2 of 20
2. Question
1 pointsThe maximum delivery pressure of compressors can be upto __________ atmospheres.
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Question 3 of 20
3. Question
1 pointsWhich of the following is not a dimension-less parameter ?
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Question 4 of 20
4. Question
1 pointsCo-efficient of velocity is __________ the coefficient of discharge.
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Question 5 of 20
5. Question
1 pointsAll pipes of a particular nominal size have the same
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Question 6 of 20
6. Question
1 pointsFor the transfer of solution of thick slurry, the pump used is a __________ pump.
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Question 7 of 20
7. Question
1 pointsWhich of the following is not concerned with the fluid-particle interaction ?
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Question 8 of 20
8. Question
1 pointsMaximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be __________ ft.
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Question 9 of 20
9. Question
1 points__________ pumps are axial flow pumps.
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Question 10 of 20
10. Question
1 pointsBrownian movement is prominent in the particle size range of __________ microns in case of settling of a particle in a fluid.
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Question 11 of 20
11. Question
1 pointsFor a particle settling in water at its terminal settling velocity, which of the following is true ?
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Question 12 of 20
12. Question
1 pointsPick out the correct statement.
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Question 13 of 20
13. Question
1 pointsShear stress in a fluid flowing in a round pipe
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Question 14 of 20
14. Question
1 pointsThe resistance wire used in a hot wire anemometer for conducting electrical current is made of
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Question 15 of 20
15. Question
1 pointsTwo dimensional stream function
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Question 16 of 20
16. Question
1 pointsWhat causes cavitation in centrifugal pump ?
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Question 17 of 20
17. Question
1 pointsDraining of shallow pits or sump is done by a sump pump, which is a __________ pump.
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Question 18 of 20
18. Question
1 pointsA hydraulic ram acts as a/an __________ pump.
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Question 19 of 20
19. Question
1 pointsThe ratio of average fluid velocity to the maximum velocity in case of laminar flow of a Newtonion fluid in a circular pipe is
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Question 20 of 20
20. Question
1 pointsThe line of action of the buoyant force passes through the centre of gravity of the
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Fluid Mechanics MCQ 3
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Question 1 of 20
1. Question
1 pointsMass velocity is independent of temperature & pressure, when the flow is
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Question 2 of 20
2. Question
1 pointsVery small pressure difference (< 5 mm water coloumn) can be most conveniently measured by a/an __________ manometer.
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Question 3 of 20
3. Question
1 pointsA differential pressure cell is used for
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Question 4 of 20
4. Question
1 pointsIf more than two branches of pipes are to be connected at the same point, then use a/an
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Question 5 of 20
5. Question
1 pointsIn case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the __________ efficiency.
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Question 6 of 20
6. Question
1 pointsAcceleration head in a reciprocating pump
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Question 7 of 20
7. Question
1 pointsThe ratio of inertial forces to elastic forces is called the __________ number.
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Question 8 of 20
8. Question
1 pointsFluid flow at increasing rate through a diverging pipe is an example of __________ flow.
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Question 9 of 20
9. Question
1 pointsThe temperature in isentropic flow
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Question 10 of 20
10. Question
1 pointsDrag force acting on a body does not depend upon the
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Question 11 of 20
11. Question
1 pointsCentrifugal pump is normally classified on the basis of the
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Question 12 of 20
12. Question
1 pointsWhere does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter ‘d’?
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Question 13 of 20
13. Question
1 pointsApplying a pressure drop across a capillary results in a volumetric flow rate ‘Q’ under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is
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Question 14 of 20
14. Question
1 pointsIn an incompressible fluid, the density is
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Question 15 of 20
15. Question
1 pointsCheck valves are used
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Question 16 of 20
16. Question
1 pointsVelocity distribution for flow between two fixed parallel plates
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Question 17 of 20
17. Question
1 pointsPriming is needed in a __________ pump.
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Question 18 of 20
18. Question
1 pointsWhich of the fluid forces are not considered in the Reynold’s equation of flow ?
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Question 19 of 20
19. Question
1 pointsFor ideally incompressible fluid, the Mach number will be
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Question 20 of 20
20. Question
1 pointsA mono pump is a __________ pump.
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Fluid Mechanics MCQ 4
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Question 1 of 20
1. Question
1 pointsHigher specific speed (200-500) of a centrifugal pump indicates that the pump is of __________ flow type.
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Question 2 of 20
2. Question
1 pointsThe variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost are P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet.
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Question 3 of 20
3. Question
1 pointsTheoretical head developed by a centrifugal pump does not depend upon the __________ the impeller.
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Question 4 of 20
4. Question
1 pointsBoundary layer separation is caused by the
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Question 5 of 20
5. Question
1 pointsWith increase in temperature, the vapor pressure of liquids
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Question 6 of 20
6. Question
1 pointsA mercury (specific gravity = 13.6) manometer connected across an orificemeter fitted in a pipe shows a manometer reading of 2 cms. If the manometer liquid is changed to carbon tetrachloride (specific gravity = 1.6), then for the same flow rate of water the new manometer reading will be __________ cms.
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Question 7 of 20
7. Question
1 pointsThe ratio of wall drag to total drag in the Stoke’s law range is
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Question 8 of 20
8. Question
1 pointsRotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg.
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Question 9 of 20
9. Question
1 pointsA pitched-blade turbine draws __________ a straight blade turbine.
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Question 10 of 20
10. Question
1 pointsThe most suitable flow measuring device for the fluid flow measurement in a very large diameter pipeline is a
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Question 11 of 20
11. Question
1 pointsA centrifugal pump is called a turbine pump, if it is having a
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Question 12 of 20
12. Question
1 pointsRemote control valve is a __________ valve.
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Question 13 of 20
13. Question
1 pointsWhich of the following quantities are computed by using the hydraulic radius for non-circular ducts ?
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Question 14 of 20
14. Question
1 pointsCentre of pressure in an immersed body is __________ the centre of gravity.
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Question 15 of 20
15. Question
1 pointsThe centre of pressure is
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Question 16 of 20
16. Question
1 pointsPascal law is not applicable for a/an __________ fluid.
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Question 17 of 20
17. Question
1 pointsIn a fluidised bed reactor
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Question 18 of 20
18. Question
1 pointsThe flow of a liquid through tapering pipe at a constant rate is an example of __________ flow.
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Question 19 of 20
19. Question
1 pointsA perfect gas
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Question 20 of 20
20. Question
1 pointsIn a/an __________ , the flow rate of fluids is obtained by measuring the difference between the impact and the static pressure.
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