# Practice Test: Question Set - 39

**1. In the Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is __________ the fluid viscosity.**

- (A) Directly proportional to

- (B) Inversely proportional to

- (C) Inversely proportional to the square root of

- (D) Independent of

**2. Pick out the wrong statement pertaining to fluid flow.**

- (A) The ratio of average velocity to the maximum velocity for turbulent
flow of Newtonian fluid in circular pipes is 0.5

- (B) The Newtonian fluid velocity in a circular pipe flow is maximum at
the centre of the pipe

- (C) Navier-Stokes equation is applicable to the analysis of viscous
flows

- (D) Hagen-Poiseuille equation is applicable to the laminar flow of
Newtonian fluids

**3. The capacity of an accumulator is the maximum**

- (A) Energy which it can store

- (B) Discharge which it can deliver

- (C) Liquid which it can store

- (D) None of these

**4.**

**For the manometer set up shown in the figure, the pressure difference**

*P*-_{A}*P*is given by_{B}- (A) (

*ρH*-

*ρ*

_{air})

*gH*

- (B) (

*ρH*-

*ρL*)

*gH*

- (C) (

*ρH*-

*ρL*)

*gH*+ (

*ρL*-

*ρ*

_{air}) .

*g*(

*L*-

*H*)

- (D) (

*ρH*-

*ρL*)

*gL*+ (

*ρL*-

*ρ*

_{air})

*gH*

**5. Priming of a centrifugal pump is done to**

- (A) Increase the mass flow rate of fluid

- (B) Develop effective pressure rise by the pump

- (C) Avoid chances of separation inside the impeller

- (D) None of these

**6. In case of a Rotameter, the density of the float material is __________ that of the liquid it replaces.**

- (A) More than

- (B) Less than

- (C) Equal to

- (D) Either (a) or (b)

**7. The fluid property which matters for falling rain drops to acquire spherical shape is its**

- (A) Pressure

- (B) Height of descend

- (C) Viscosity

- (D) Surface tension

**8. For turbulent flow in smooth circular pipe, the velocity distribution is a function of the distance '**

*d*' measured from the wall of the pipe and the friction velocity 'v', and it follows a __________ relationship.- (A) Logarithmic

- (B) Linear

- (C) Hyperbolic

- (D) Parabolic

**9. Venturimeters, orificemeters and nozzles are used to measure the fluid discharge from a pipeline. The average fluid velocity in a pipeline can be measured by a/an**

- (A) Weir

- (B) Hot wire anemometer

- (C) Cup and vane anemometer

- (D) None of these

**10. Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation?**

- (A) Decrease in effect

- (B) Increase in thrust

- (C) Develops noise

- (D) Develops high pressure

**11. A centrifugal pump loses prime after starting. The reason of this trouble may be**

- (A) Incomplete priming

- (B) Too high a suction lift

- (C) Low available NPSH and air leaks in the suction pipe

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

**12.**

*C*is always ___________{d}*C*._{c}- (A) Greater than

- (B) Less than

- (C) Equal to

- (D) Either more or less than

**13. The kinetic energy correction factor for velocity distribution of laminar flow is**

- (A) 0.5

- (B) 1.66

- (C) 1

- (D) 2

**14. A gas (density = 1.5 kg/m**

^{3}, viscosity = 2 × 10^{‒5}kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5 kg/m^{3}and viscosity of 3 × 10^{‒5}kg/m.s flowing at 3 m/s will be- (A) 8400 Pa/m

- (B) 12600 Pa/m

- (C) 18900 Pa/m

- (D) 16800 Pa/m

**15. The co-efficient of drag and lift for an incompressible fluid depends on the**

- (A) Reynolds number

- (B) Froude number

- (C) Mach number

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

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