# Practice Test: Question Set - 42

**1. Water flow rate in a pipe of 3.5 meters diameter can be most economically and conveniently measured by a/an**

- (A) Pitot tube

- (B) Venturimeter

- (C) Orificemeter

- (D) Rotameter

**2. Which of the following is the ‘Blasius equation’, relating friction factor to the Reynolds number?**

- (A)

*f*= 0.079.

*N*

_{Re}^{-0.25}

- (B)

*f*

^{-0.5}= 4.07 log

_{e}(

*N*)

_{Re}f^{-0.6}

- (C) Both ‘a’ and ‘b’

- (D) None of these

**3. Maintenance cost of a __________ pump for a particular duty is the least.**

- (A) Centrifugal

- (B) Reciprocating

- (C) Volute

- (D) Gear

**4. In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant?**

- (A) Rotational

- (B) Unsteady

- (C) Turbulent

- (D) Non-uniform

**5. With a constant diameter impeller of a centrifugal pump**

- (A) Its capacity varies directly as the square of speed

- (B) Head varies as the square of speed

- (C) Horsepower input varies as the square of speed

- (D) Head varies as the speed

**6. Draining of shallow pits or sump is done by a sump pump, which is a __________ pump.**

- (A) Single stage vertical

- (B) Centrifugal

- (C) Plunger

- (D) Diffuser

**7. Which of the following is an undesirable property of a manometric liquid?**

- (A) Non-sticky & non-corrosive nature

- (B) High vapor pressure

- (C) Low viscosity & surface tension

- (D) Low co-efficient of thermal expansion

**8. Each term of the Bernoulli's equation written in the form, (**

*p*/*ρ*) + (*g*/*g*)._{c}*Z*+ (*v*^{2}/2*g*) = constant, represents the total energy per unit_{c}- (A) Mass

- (B) Volume

- (C) Specific weight

- (D) None of these

**9. In Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the __________ of its diameter.**

- (A) Inverse

- (B) Square root

- (C) Second power

- (D) First power

**10. What causes convective acceleration in fluid flow?**

- (A) Steep slope in flow

- (B) Unsteady nature of flow

- (C) Non-uniformity of flow

- (D) Turbulence in flow

**11. The general relationship between speed N, head H, power P and discharge Q for a centrifugal pump is**

- (A) Q∝N : H∝N

^{2}: P∝N

^{3}

- (B) Q∝N

^{2}: H∝N

^{3}: P∝N

- (C) Q∝N : H∝N

^{3}: P∝N

^{2}

- (D) Q∝N

^{3}: H∝N : P∝N

^{2}

**12. A streamline is**

- (A) The line connecting the mid-points of flow cross-sections

- (B) Defined for uniform flow only

- (C) Drawn normal to the velocity vector at every point

- (D) Always the path of a particle

**13. A bed consists of particles of density 2000 kg/m**

^{3}. If the height of the bed is 1.5 meters and its porosity 0.6, the pressure drop required to fluidize the bed by air is- (A) 25.61 kPa

- (B) 11.77 kPa

- (C) 14.86 kPa

- (D) 21.13 kPa

**14. With diminishing cross-sectional area in case of subsonic flow in a converging nozzle, the**

- (A) Velocity increases

- (B) Pressure decreases

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

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

**15. Efficiency of power transmission (η) through a circular pipe is given by (h**

_{t}- h_{f})/h_{t}, which has a maximum value of __________ percent.- (A) 33:3

- (B) 50

- (C) 66.6

- (D) 88.8

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