Question 51 : Overall efficiency of a centrifugal pump is the ratio of
1. actual workdone by the pump to the energy supplied to the pump by the prime mover
2. energy supplied to the pump to the energy available at the impeller
3. manometric head to the energy supplied by the impeller per kN of water
4. energy available at the impeller to the energy supplied to the pump by the prime mover
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Question 52 : In order to avoid cavitation in centrifugal pumps
1. the delivery pressure should be high
2. the suction pressure should be low
3. the suction pressure should be high
4. the delivery pressure should be low
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Question 53 : The working of which of the following hydraulic units is based on Pascal's law?
1. Hydraulic coupling
2. Jet pump
3. Hydraulic press
4. Air lift pump
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Question 54 : In an inward flow reaction turbine
1. the flow of water is partly radial and partly axial
2. the water enters at the centre of the wheel and then flows towards the outer periphery of the wheel
3. the water flows parallel to the axis of the wheel
4. the water enters the wheel at the outer periphery and then flows towards the centre of the wheel
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Question 55 : A hydraulic ram is a device used to
1. store the energy of water
2. to lift small quantity of water to a greater height when a large quantity of water is available at a smaller height
3. to lift water from deep wells
4. increase the pressure of water
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Question 56 : Dynamic similarity is said to exist between the model and the prototype, if both of them
1. are identical in shape, but differ only in size
2. have identical velocities
3. are equal in size and shape
4. none of the above
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Question 57 : Kinematic similarity is said to exist between the model and the prototype, if both of them
1. have identical forces
2. are equal in size and shape
3. have identical velocities
4. are identical in shape, but differ only in size
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Question 58 : The impeller of a centrifugal pump may have
1. vortex casing
2. volute casing
3. volute casing with guide blades
4. any one of these
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Question 59 : The ratio of quantity of liquid discharged per second from the pump to the quantity of liquid passing per second through the impeller is known as
1. mechanical efficiency
2. manometric efficiency
3. volumetric efficiency
4. overall efficiency
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Question 60 : The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is
1. 60%
2. 50%
3. 80%
4. 40%
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