Hydraulics & Fluid Machineries MCQ Question with Answer

Hydraulics & Fluid Machineries MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

Question No : 71
The cavitation in a hydraulic machine

Causes noise and vibration of various parts

Reduces the discharge of a turbine

Causes sudden drop in power output and efficiency

All of the above

Question No : 72
Discharge of a centrifugal pump is

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

Question No : 73
Maximum impulse will be developed in hydraulic ram when

Waste valve closes suddenly

Supply pipe is long

Supply pipe is short

Ram chamber is large

Question No : 74
The flow rate in gear pump

Increases with increase in pressure

Decreases with increase in pressure

More or less remains constant with increase in pressure

Unpredictable

Question No : 75
The maximum number of jets, generally, employed in an impulse turbine without jet interference are

Two

Four

Six

Eight

Question No : 76
Indicator diagram of a reciprocating pump is a graph between

Flow vs. swept volume

Pressure in cylinder vs. swept volume

Flow vs. speed

Pressure vs. speed

Question No : 77
The optimum value of vane exit angle for a centrifugal pump impeller is

10-15°

20-25°

30-40°

50-60°