Hydraulic Machines

31. In axial flow fans and turbines, fluid enters and leaves as follows

1. radially, axially
2. axially, radially
3. axially, axially
4. radially, radially
5. combination of axial and radial.

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32. In centrifugal pumps, maximum efficiency is obtained when the blades are

1. straight
2. bent forward
3. bent backward
4. radial
5. given aerofoil section.

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33. In reaction turbine, draft tube is used

1. to transport water downstream without eddies
2. to convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section
3. for safety of turbine
4. to increase flow rate
5. none of the above.

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

1. flow vs swept volume
2. pressure in cylinder vs swept volume
3. flow vs speed
4. pressure vs speed
5. swept volume vs speed.

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35. Low specific speed of a pump implies it is

1. centrifugal pump
2. mixed flow pump
3. axial flow pump
4. any one of the above
5. none of the above.

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36. Low specific speed of turbine implies it is

1. propeller turbine
2. Francis turbine
3. impulse turbine
4. any one of the above
5. none of the above.

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37. Maximum impulse will be developed in hydraulic ram when

1. waste valve closes suddenly
2. supply pipe is long
3. supply pipe is short
4. ram chamber is large
5. supply pipe has critical diameter,

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38. Medium specific speea of turbine implies it is

1. propeller turbine
2. Francis turbine
3. impulse turbine
4. any one of the above
5. none of the above.

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39. Medium specific speed of a pump implies it is

1. centrifugal pump
2. mixed flow pump
3. axial flow pump
4. any one of the above
5. none of the above.

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

1. rotational flow
2. radial
3. forced spiral vortex flow
4. forced cylindrical vortex flow
5. spiral vortex flow.

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