Question 31 : Power required to drive a centrifugal pump is directly proportional to __________ of its impeller.
1. cube of diameter
2. fourth power of diameter
3. diameter
4. square of diameter
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Question 32 : 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. overall efficiency
2. volumetric efficiency
3. manometric efficiency
4. mechanical efficiency
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Question 33 : What is the head of water available at turbine inlet in hydro-electric power plant called?
1. head race
2. tail race
3. gross head
4. net head
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Question 34 : The overall efficiency of a reaction turbine is the ratio of
1. actual work available at the turbine to the energy imparted to the wheel
2. power produced by the turbine to the energy actually supplied by the turbine
3. workdone on the wheel to the energy (or head of water) actually supplied to the turbine
4. none of the mentioned
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Question 35 : The runner of __________ turbine always be under pressure of above atmospheric pressure
1. Turgo
2. Girand
3. Kaplan
4. None of the mentioned
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Question 36 : Slip of a reciprocating pump is defined as the
1. sum of actual discharge and the theoretical discharge
2. ratio of actual discharge to the theoretical discharge
3. difference of theoretical discharge and the actual discharge
4. product of theoretical discharge and the actual discharge
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Question 37 : Gross head is the difference between __________
1. head race and tail race
2. head race and net head
3. head race and friction losses
4. net head and friction losses
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Question 38 : Manometric head, in case of a centrifugal pump, is equal to
1. Suction lift + Loss of head in suction pipe due to friction + Delivery lift + Loss of head in delivery pipe due to friction + Velocity head in the delivery pipe
2. Energy per kN at outlet of impeller – Energy per kN at inlet of impeller
3. Workdone per kN of water – Losses within the impeller
4. All of the mentioned
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Question 39 : The working of which of the following hydraulic units is based on Pascal's law?
1. Hydraulic coupling
2. Air lift pump
3. Jet pump
4. Hydraulic press
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Question 40 : What is runaway speed of the runner of Pelton wheel?
1. maximum unsafe speed of the runner due to sudden increase in load on turbine
2. minimum safe speed of the runner due to sudden increase in load on turbine
3. maximum unsafe speed of the runner due to sudden decrease in load on turbine
4. minimum safe speed of the runner due to sudden decrease in load on turbine
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