Question 21 : Head developed by a centrifugal pump is
1. proportional to diameter of impeller
2. proportional to diameter and speed of impeller
3. none of the above
4. proportional to speed of impeller
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Question 22 : Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft?
1. Hydraulic accumulator
2. Hydraulic torque converter
3. Hydraulic ram
4. Hydraulic intensifier
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Question 23 : A double overhung Pelton wheel has
1. four runners
2. two jets
3. four jets
4. two runners
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Question 24 : Braking jet in an impulse turbine is used
1. to break the jet of water
2. to bring the runner to rest in a short time
3. none of these
4. to change the direction of runner
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Question 25 : Which of the following statement is correct as regard to water wheels?
1. They are suitable even for low water heads.
2. They have slow speeds.
3. They give constant efficiency, even if the discharge is not constant
4. all of the above
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Question 26 : Which of the following statement is wrong ?
1. A Francis turbine is an impulse turbine.
2. The reaction turbines are used for low head and high discharge.
3. The angle of taper on draft tube is less than 8°.
4. An impulse turbine is generally fitted slightly above the tail race.
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Question 27 : The hydraulic efficiency of an impulse turbine is the
1. ratio of the actual power produced by the turbine to the energy actually supplied by the turbine
2. ratio of the actual work available at the turbine to the energy imparted to the wheel
3. ratio of the work done on the wheel to the energy of the jet
4. none of the above
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Question 28 : The overall efficiency for a Pelton wheel lies between
1. 0.65 to 0.75
2. 0.75 to 0.85
3. 0.50 to 0.65
4. 0.85 to 0.90
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Question 29 : Which of the following pump is successfully used for lifting water from deep wells?
1. Reciprocating pump
2. Air lift pump
3. Centrifugal pump
4. Jet pump
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Question 30 : Which of the following pump is sucessfully used for lifting water to the boilers?
1. Jet pump
2. Reciprocating pump
3. Centrifugal pump
4. Air-lift pump
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