Question 21 : In which turbine the pressure energy of water is first converted into kinetic energy by means of nozzle kept close to the runner?
1. Impulse turbine
2. Reaction turbine
3. Both a and b
4. None of the mentioned
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Question 22 : A hydraulic coupling belongs to the category of
1. power absorbing machines
2. energy transfer machines
3. power developing machines
4. energy generating machines
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Question 23 : Which of the following is an example of impulse turbine?
1. Propeller turbine
2. Francis turbine
3. Kaplan turbine
4. Pelton wheel
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Question 24 : Kinematic similarity is said to exist between the model and the prototype, if both of them
1. are equal in size and shape
2. have identical velocities
3. are identical in shape, but differ only in size
4. have identical forces
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Question 25 : By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is
1. 84.8%
2. 74.8%
3. 64.8%
4. 54.8%
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Question 26 : The mechanical efficiency of an impulse turbine is
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 mentioned
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Question 27 : The maximum number of jets, generally, employed in an impulse turbine without jet interference are
1. 2
2. 6
3. 7
4. 5
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Question 28 : The pressure of water is atmospheric and remains constant while passing over the runner in __________
1. Impulse turbine
2. Reaction turbine
3. Both a and b
4. None of the mentioned
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Question 29 : The speed of an imaginary turbine, identical with the given turbine, which will develop a unit power under a unit head, is known as
1. unit speed
2. terrific speed
3. specific velocity
4. specific speed
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Question 30 : The cups at the periphery of the Pelton wheel are?
1. equiangular
2. equidistant
3. equimolar
4. none of the mentioned
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