# Practice Test: Question Set - 29

**1. In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where**

*M*= molecular weight of the gas).- (A) 1/√

*M*

- (B) √

*M*

- (C) 1/

*M*

- (D)

*M*

**2. For the same terminal conditions and valve size, the pressure drop in a fully opened globe valve as compared to that in a gate valve is**

- (A) More

- (B) Less

- (C) Equal

- (D) Either (a) or (b); depends on the viscosity of the fluid

**3. The bulk modulus of elasticity of a liquid**

- (A) Is zero for incompressible liquid

- (B) Decreases with pressure

- (C) Is independent of temperature & pressure

- (D) Increases with pressure

**4. Maximum 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.**

- (A) 40

- (B) 34

- (C) 8

- (D) 37

**5. The most suitable flow measuring device for the fluid flow measurement in a very large diameter pipeline is a**

- (A) Weir

- (B) Pitot tube

- (C) Kennison nozzle

- (D) V-notch

**6. The terminal velocity of a particle moving through a fluid varies as d**

_{p}^{n}. The value of n is equal to __________ in Stoke's law regime.- (A) 1

- (B) 0.5

- (C) 2

- (D) 1.5

**7. The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stoke's law range is proportional to the**

- (A) Inverse of fluid viscosity

- (B) Square of particle size

- (C) Difference in the densities of the particle & fluid

- (D) All (a), (b) and (c)

**8. Which is the correct relationship for a centrifugal pump? (Where,**

*D*= Impeller diameter, inches*H*= Head developed, ft of liquid pumped*N*= Speed of pump, rpm)- (A)

*D*= 1840 H

^{0.5}/N

- (B)

*D*= 1840 N/H

^{0.5}

- (C)

*H*= 1840 D

^{0.5}/N

- (D)

*D*= 1840 H/N

**9. The resistance wire used in a hot wire anemometer for conducting electrical current is made of**

- (A) Copper

- (B) Tungsten

- (C) Chromium

- (D) Aluminium

**10. Pump used for the transportation of molten sodium in a fast breader reactor is a/an __________ pump.**

- (A) Reciprocating

- (B) Plunger

- (C) Electromagnetic

- (D) Gear

**11. As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re << 1**

- (A) Increases linearly with V

- (B) Decreases linearly with V

- (C) Decreases as V

^{2}

- (D) None of these

**12. Head developed by a centrifugal pump depends on its**

- (A) Speed

- (B) Impeller diameter

- (C) Both (a) and (b)

- (D) Neither (a) nor (b)

**13. The centre of pressure is**

- (A) Always below the centroid of the area

- (B) Always above the centroid of the area

- (C) A point on the line of action of the resultant force

- (D) At the centroid of the submerged area

**14. Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the**

- (A) Back flow of fluid in the event of stoppage of pump

- (B) Discharge pressure

- (C) Flow of liquid during operation of the pump

- (D) All (a), (b) and (c)

**15. The rate of shear versus the shear stress curves are time dependent for __________ fluid.**

- (A) Thixotropic

- (B) Rheopectic

- (C) Both (a) & (b)

- (D) Neither (a) nor (b)

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