# Practice Test: Question Set - 01

1. A centrifugal pump designed for handling water (μ = 1 cp) will deliver __________ when pumping a thicker oil (μ = 30 cp).
(A) Less head & less capacity
(C) More capacity
(D) Less head & more capacity

2. Delivery of insufficient quantity of liquid by a pump may be caused by
(A) Air leak in the inlet
(B) Low rpm
(C) Too high a lift
(D) All (a), (b) and (c)

3. Two fluids are flowing through two similar pipes of the same diameter. The Reynold's number is same. For the same flow rate if the viscosity of a fluid is reduced to half the value of the first fluid, the pressure drop will
(A) Increase
(B) Decrease
(C) Remain unchanged
(D) Data insufficient to predict relative pressure drop

4. A conical tank with a bottom opening of cross-sectional area A is filled with water and is mounted on supports as shown in the figure. What is the force F with which plate X must be pushed up to prevent water from leaking? Assume that the density of air is negligible as compared to the density of water ρL.
(A) ρL . Vg
(B) ρL . A.Hg
(C) ρL . Vg/2
(D) ρL .Vg/3

5. In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow?
(A) Discharge of water by a centrifugal pump being run at a constant rpm
(B) Water flow in the suction and discharge pipe of a reciprocating pump
(C) Water discharge from a vertical vessel in which constant level is maintained
(D) Low velocity flow of a highly viscous liquid through a hydraulically smooth pipe

6. Stoke's equation is valid in the Reynolds number range
(A) 0.01 to 0.1
(B) 0.1 to 2
(C) 2 to 10
(D) 10 to 100

7. Which of the following is the most common pump for pumping either raw sewage or sludge?
(A) Electromagnetic pump
(B) Centrifugal pump
(C) Reciprocating pump
(D) Gear pump

8. Purpose of relief valve in a reciprocating pump is to
(A) Protect the pump against developing excessive pressure
(B) Facilitate unidirectional flow of liquid
(C) Reduce the discharge pressure
(D) Control the rate of discharge

9. In centrifugal pumps, cavitation occurs, when pressure of the impeller eye or vane becomes
(A) Less than atmospheric pressure
(B) More than liquid vapor pressure
(C) Less than liquid vapor pressure
(D) More than atmospheric pressure

10. In isotropic turbulence, the __________ are equal to each other.
(A) Temporal velocity components
(B) Mean square of velocity fluctuations in the three co-ordinate directions
(C) Root mean square of velocity fluctuations in the three co-ordinate directions
(D) None of these

11. When the water is warm, the height to which it can be lifted by a pump
(A) Decreases due to reduced viscosity
(B) Decreases due to reduced vapor pressure
(C) Increases due to increased vapor pressure
(D) Decreases due to increased frictional resistance

12. What is the maximum theoretical suction lift (meters) of a reciprocating pump?
(A) 5
(B) 10
(C) 50
(D) 100

13. Pressure drop in a fluidised bed reactor is __________ that in a similar packed bed reactor.
(A) Less than
(B) Greater than
(C) Same as
(D) None of these

14. Which of the following facilitates close control of flow of fluids?
(A) Gate valve
(B) Globe valve
(C) Butterfly valve
(D) Check valve

15. In which of the following body shapes, the pressure drag is large compared to the friction drag?
(A) Stream line body
(B) Two dimensional body
(C) Bluff body
(D) None of these

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