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 : 15
The impeller of a centrifugal pump may have

Volute casing
Volute casing with guide blades
Vortex casing
Any one of these

Question No : 16
The discharge through a reaction turbine ________ with the increase in unit speed.

Remain same
None of these

Question No : 17
In a reciprocating pump, air vessels are used to

Smoothen the flow
Reduce suction head
Increase delivery head
Reduce acceleration head

Question No : 18
In a centrifugal pump casing, the flow of water leaving the impeller, is

Rectilinear flow
Radial flow
Free vortex motion
Forced vortex

Question No : 19
A hydraulic ram is a device used to

Store the energy of water
Increase the pressure of water
To lift water from deep wells
To lift small quantity of water to a greater height when a large quantity of water is available at a smaller height

Question No : 20
Puck up the wrong statement about centrifugal pump

Discharge a diameter
Head a speed²
Head a diameter
Power a speed⁴

Question No : 21
The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by

[2(Vr - v) v]/ Vr²
2(Vr + v) v]/ Vr²
[(Vr - v) v]/ Vr
[(Vr + v) v]/ Vr