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Fluid Mechanics Online Exam Quiz

Important questions about Fluid Mechanics. Fluid Mechanics MCQ questions with answers. Fluid Mechanics exam questions and answers for students and interviews.

1. When the momentum of one fluid is used for moving another fluid, such a device is called a/an


A : jet pump

B : blower

C : acid egg

D : none of these

2. A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke's law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity


A : same as that of A.

B : one fourth as that of A.

C : twice as that of A.

D : four times as that of A.

3. The normal stress is the same in all directions at a point in a fluid, when the fluid is


A : non-viscous.

B : incompressible.

C : both (a) and (b).

D : having no motion of one fluid layer relative to the other.

4. The maximum delivery pressure of compressors can be upto __________ atmospheres.


A : 10

B : 100

C : 250

D : 1000

5. Molten soap mass is transported by a __________ pump.


A : diaphragm

B : reciprocating

C : gear

D : centrifugal

6. For the transfer of solution of thick slurry, the pump used is a __________ pump.


A : reciprocating

B : gear

C : diaphragm

D : centrifugal

7. The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the


A : discharge.

B : suction.

C : suction minus vapor pressure of the liquid at suction temperature.

D : discharge minus vapor pressure of the liquid at the discharge temperature.

8. __________ pumps are axial flow pumps.


A : Turbine

B : Propeller

C : Diffuser

D : none of these

9. A Bingham fluid of viscosity ? = 10 Pa.s and yield stress, ? 0 = 10 KPa, is shared between flat parallel plates separated by a distance of 10 -3 m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is


A : 10 KPa

B : 20 KPa

C : 30 KPa

D : 40 KPa

10. Nominal size of the discharge pipe of a pump is usually __________ the nominal size of the inlet pipe.


A : smaller than

B : larger than

C : same as

D : twice

1. The dimension of dynamic viscosity is


A : ML -1 T -1

B : L 2 T -1

C : LT -2

D : ML -1 T -2

2. Which of the following denotes the effect of compressibility in fluid flow?


A : Weber number

B : Mach number

C : Euler number

D : Reynolds number

3. Schedule number of a pipe, which is a measure of its wall thickness, is given by


A : 1000 P'/S

B : 100 P'/S

C : 1000 S/P'

D : 10000 P'/S

4. Which of the following is not a dimension-less parameter?


A : Euler number

B : Specific gravity

C : Fanning friction factor

D : None of these

5. Dimension of surface tension is(where, F = force, L = length)


A : FL -1

B : F -1 . L

C : F.L -2

D : F -2 . L

6. In fluid flow, cavitation is caused, if the


A : fluid velocity decreases to zero.

B : total energy decreases.

C : both (a) and (b).

D : flow pressure approaches its vapor pressure at the prevailing temperature.

7. Head developed by a centrifugal pump depends on its


A : speed

B : impeller diameter

C : both (a) and (b)

D : neither (a) nor (b)

8. All pipes of a particular nominal size have the same


A : inside diameter

B : outside diameter

C : thickness

D : none of these

9. At high Reynolds number


A : inertial forces control and viscous forces are unimportant.

B : viscous forces predominate.

C : inertial forces are unimportant and viscous forces control.

D : none of these.

10. Water hammer in a pipeline results from the


A : bursting of pipelines due to closure by a valve.

B : rapid pressure change due to a rapid change in the rate of flow.

C : pressure increase due to closure of a valve resulting in decrease in rate of flow.

D : none of these.

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