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Mechanical Engineering Objective Questions { Hydraulic Machines }

22. The percentage slip for a reciprocating pump is defmed as the percentage of
A.Actual discharge/theoretical discharge
B.Actual speed/theoretical speed
C.Swept voliune/cylinder volume
D.(Theoretical discharge – actual discharge)/ theoretical discharge
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23. If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge
A.Same quantity of liquid
B.0.75 Q
D.1.5 Q
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24. Power required to drive a centrifugal pump is proportional to
A.Impeller diameter (D)
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25. The optimum value of vane exit angle for a centrifugal pump impeller is
A.10- 15°
B.20 - 25°
C.30- 40°
D.50 - 60°
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26. In a centrifugal pump, the liquid enters the pump
A.At the top
B.At the bottom
C.At the centre
D.From sides
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27. For small discharge at high pressure, following pump is preferred
C.Mixed flow
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28. In centrifugal pumps, maximum efficiency is obtained when the blades are
B.Bent forward
C.Bent backward
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