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 : 8
The flow ratio of Francis turbine is defined as the ratio of the

Velocity of flow at inlet to the theoretical jet velocity

Theoretical velocity of jet to the velocity of flow at inlet

Velocity of runner at inlet to the velocity of flow at inlet

None of the above

Question No : 9
A ship with jet propulsion draws water through inlet orifices at right angles to the direction of its motion. The propelling force of the jet is (where a = Area of the jet, Vr = Relative velocity of the jet and ship = V + v, v = Velocity of the ship, and V = Velocity of the jet issuing from the ship)

waVr /g × (Vr + v)

waVr /g × (Vr - v)

waVr /g × (Vr + v)²

waVr /g × (Vr - v)²

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Question No : 10
Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of

39.2 %

49.2 %

68.8 %

84.8 %

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Question No : 11
Manometric head, in case of a centrifugal pump, is equal to

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

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