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.

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Question No : 1
The discharge through a reaction turbine with increase in unit speed

Remain unaffected
First increases and then decreases

Question No : 2
Head developed by a centrifugal pump depends on

Impeller diameter
Fluid density
Both (A) and (B) above

Question No : 3
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

Manometric efficiency
Mechanical efficiency
Overall efficiency
Volumetric efficiency

Question No : 4
Any change in load is adjusted by adjusting following parameter on turbine

Net head
Absolute velocity
Blade velocity

Question No : 5
The force exerted by a jet of water (in a direction normal to flow) impinging on a fixed plate inclined at an angle θ with the jet is

waV/2g × sinθ
waV/g × sinθ
waV²/2g × sin2θ
waV²/g × sinθ

Question No : 6
The mechanical efficiency of an impulse turbine is

Ratio of the actual power produced by the turbine to the energy actually supplied by the turbine
Ratio of the actual work available at the turbine to the energy imparted to the wheel
Ratio of the Work done on the wheel to the energy of the jet
None of the above

Question No : 7
The water in a jet propelled boat is drawn through the openings facing the direction of motion of the boat. The efficiency of propulsion is given by

2V/(vr - v)
2V/(vr + v)
V/(vr - v)
V/(vr + v)