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M

Mr. Dubey • 51.43K Points
Coach 

Q. 81) A centrifugal pump should be so installed above the water level in the sump such that

(A) The negative pressures are not allowed to develop in the impeller
(B) The negative pressures do not reach as low a value as the vapour pressure
(C) Its height is more than 10·28 m at ordinary temperature of liquid
(D) None of the above.
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M

Mr. Dubey • 51.43K Points
Coach 

Q. 82) The specific speed of a pump is defined as the speed of unit of such a size that it

(A) Produces unit power with unit head available
(B) Delivers unit discharge at unit head
(C) Requires unit power to develop unit head
(D) Delivers unit discharge at unit power.
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M

Mr. Dubey • 51.43K Points
Coach 

Q. 83) Which of the following statements pertaining to a given centrifugal pump is correct?

(A) Discharge varies as the square of speed
(B) Power varies as the square of speed
(C) Discharge varies directly as speed
(D) Head varies inversely as speed.
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M

Mr. Dubey • 51.43K Points
Coach 

Q. 84) The delivery valve, while starting centrifugal pump, is kept

(A) Fully closed
(B) Fully open
(C) Half open
(D) In any position.
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M

Mr. Dubey • 51.43K Points
Coach 

Q. 85) Which of the following is not a dimensionless parameter?

(A) Friction factor
(B) Specific speed
(C) Thoma’s cavitation parameter
(D) Pressure co-efficient.
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M

Mr. Dubey • 51.43K Points
Coach 

Q. 86) With reference to manometric head which of the following statements is correct?

(A) It is the head developed by the pump.
(B) It is the height to which water is lifted by the pump measured above the pump centreline.
(C) it is the difference in elevation between the water surface in the high level reservoir and the water level in the sump.
(D) It is the difference in the piezometric heads between the points on the delivery and suction pipes as close to the pump as possible.
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M

Mr. Dubey • 51.43K Points
Coach 

Q. 87) Higher specific speeds (160 to 500) of centrifugal pump indicate that the pump is of

(A) Radial flow type
(B) Axial flow type
(C) Mixed flow type
(D) Any of these types.
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M

Mr. Dubey • 51.43K Points
Coach 

Q. 88) What will happen if requirements of net positive suction head (NPSH) for a given pump are not satisfied?

(A) The pump will get cavitated.
(B) The pump will consume more power.
(C) ---
(D) ---
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M

Mr. Dubey • 51.43K Points
Coach 

Q. 89) In centrifugal pumps, cavitation is reduced by

(A) Increasing the flow velocity
(B) Reducing the discharge
(C) Throttling the discharge
(D) Reducing the suction head.
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M

Mr. Dubey • 51.43K Points
Coach 

Q. 90) Which of the following statements pertaining to a centrifugal pump is incorrect?

(A) The suction lift of a pump can be upto 10·3 m or even more.
(B) The impellers of a multi-stage pump are arranged in parallel to discharge a large quantity of liquid.
(C) ---
(D) ---
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