# Mechanical Engineering - Hydraulic Machines

### Exercise :: Hydraulic Machines - Section 1

16.

Slip of a reciprocating pump is defined as the

 A. ratio of actual discharge to the theoretical discharge B. sum of actual discharge and the theoretical discharge C. difference of theoretical discharge and the actual discharge D. product of theoretical discharge and the actual discharge

Explanation:

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17.

The efficiency of a centrifugal pump will be maximum when the blades are bent backward.

 A. Yes B. No

Explanation:

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18.

Multi-stage centrifugal pumps are used to

 A. give high discharge B. produce high heads C. pump viscous fluids D. all of these

Explanation:

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19.

The specific speed of a centrifugal pump, delivering 750 litres of water per second against a head of 15 metres at 725 r.p.m., is

 A. 24.8 r.p.m. B. 48.2 r.p.m C. 82.4 r.p.m. D. 248 r.p.m

Explanation:

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20.

Theoretical power required (in watts) to drive a reciprocating pump is (where w = Specific weight of liquid to be pumped in N/m3, Q = Discharge of the pump in m3/s, Hs = Suction head in metres, and Hd = Delivery head in metres)

 A. wQHs B. wQHd C. wQ(Hs - Hd) D. wQ(Hs + Hd)