Hydraulic Machines MCQs

directly proportional to diameter of its impeller

inversely proportional to diameter of its impeller

directly proportional to (diameter)2 of its impeller

inversely proportional to (diameter)2 of its impeller

have identical velocities

are equal in size and shape

are identical in shape, but differ only in size

have identical forces

power produced by the turbine to the energy actually supplied by the turbine

actual work available at the turbine to the energy imparted to the wheel

workdone on the wheel to the energy (or head of water) actually supplied to the turbine

none of the above

manometric efficiency

mechanical efficiency

overall efficiency

volumetric efficiency

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

Workdone per kN of water – Losses within the impeller

Energy per kN at outlet of impeller – Energy per kN at inlet of impeller

all of the above

give high discharge

produce high heads

pump viscous fluids

all of these

to run the turbine full

to prevent air to enter the turbine

to increase the head of water by an amount equal to the height of the runner outlet above the tail race

to transport water to downstream

[A]. Agree

[B]. Disagree

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[A]. 10° to 15°

[B]. 15° to 20°

[C]. 20° to 25°

[D]. 25° to 30°

[A]. 0.25 kW

[B]. 0.75 kW

[C]. 1.75 kW

[D]. 3.75 kW