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
- (B) More
head
- (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