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Hydraulic Machines interview questions


Question 1:

If Hg is the gross or total head and hf is the head lost due to friction, then net or effective head (H) is given by

H = Hg - hf

Question 2: In a Kaplan turbine runner, the number of blades are generally between

4 to 8

Question 3:The overshot water wheels are those in which the wheel runs entirely by the __________ of water.

weight

Question 4: The mechanical efficiency of an impulse turbine is

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

Question 5:Power required to drive a centrifugal pump is directly proportional to __________ of its impeller.

fourth power of diameter

Question 6: Discharge of a centrifugal pump is

directly proportional to (diameter)2 of its impeller

Question 7: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 power of the wheel is

1.75 kW

Question 8:The static head of a centrifugal pump is equal to the __________ of suction head and delivery head.

Sum

Question 9:Geometric similarity is said to exist between the model and the prototype, if both of them

are identical in shape, but differ only in size

Question 10: The ratio of actual work available at the turbine to the energy imparted to the wheel is known as __________ efficiency.

mechanical

Question 11:The speed of a turbine runner is

directly proportional to H1/2

Question 12:Discharge of a centrifugal pump is (where N = Speed of the pump impeller)

directly proportional to N

Question 13:n a reaction turbine, the draft tube is used

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

Question 14: The power produced by the reaction turbine is __________ to the head of water.

directly proportional

Question 15:The specific speed of a centrifugal pump, delivering 750 litres of water per second against a head of 15 metres at 725 r.p.m., is

82.4 r.p.m.




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