Question 41 : In a Francis turbine runner, the number of blades are generally between
1. 2 to 4
2. 4 to 8
3. 8 to 16
4. 16 to 24
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Question 42 : A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is
1. 0.36
2. 0.26
3. 0, 46
4. 0.56
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Question 43 : 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. 48, 8%
2. 88.40%
3. 39.20%
4. 88%
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Question 44 : By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power.The saving in case of a double acting reciprocating pump is
1. 88%
2. 48.80%
3. 39.20%
4. 88.40%
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Question 45 : If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.
1. kinematic similarity
2. geometric similarity
3. dynamic similarity
4. none of these
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Question 46 : A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit speed of the wheel is
1. 10 r.p.m.
2. 20 r.p.m.
3. 80 r.p.m.
4. 40 r.p.m.
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Question 47 : Which of the following pump is generally used to pump highly viscous fluid?
1. Air lift pump
2. Reciprocating pump
3. Screw pump
4. Centrifugal pump
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Question 48 : The flow ratio of Francis turbine is defined as the ratio of the
1. velocity of flow at inlet to the theoretical jet velocity
2. velocity of runner at inlet to the velocity of flow at inlet
3. theoretical velocity of jet to the velocity of flow at inlet
4. none of the above
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Question 49 : The hydraulic efficiency of a reaction turbine, is the ratio of
1. actual work available at the turbine to energy imparted to the wheel
2. none of the above
3. power produced by the turbine to the energy actually supplied by the turbine
4. workdone on the wheel to the energy (or head of water) actually supplied to the turbine
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Question 50 : In a reciprocating pump, air vessels are used to
1. smoothen the flow
2. increase delivery head
3. reduce acceleration head
4. reduce suction head
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