Mechanical Engineering Objective Questions { Hydraulic Machines }

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29. Motion of a liquid in a volute casing of a centrifugal pump is an example of

A. Rotational flow

B. Spiral vortex flow

C. Forced spiral vortex flow

D. Forced cylindrical vortex flow

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30. For very high discharge at low pressure such as for flood control and irrigation applications, following type of pump is preferred

C. Reciprocating

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31. Medium specific speed of a pump implies it is

A. Centrifugal pump

B. Mixed flow pump

C. Axial flow pump

D. Any one of the above

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32. High specific speed of a pump implies it is

A. Centrifugal pump

B. Mixed flow pump

C. Axial flow pump

D. Any one of the above

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33. Indicator diagram of a reciprocating pump is a graph between

A. Flow vs swept volume

B. Pressure in cylinder vs swept volume

C. Flow vs speed

D. Pressure vs speed

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34. Low specific speed of turbine implies it is

A. Propeller turbine

B. Francis turbine

C. Impulse turbine

D. Any one of the above

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35. Runaway speed of a hydraulic turbine is

A. Full load speed

B. The speed at which turbine runner will be damaged

C. The speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open

D. The speed corresponding to maximum overload permissible

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