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 : 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.

Decreases

Increases

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(V_r - v) v]/ V_r²

2(V_r + v) v]/ V_r²

[(V_r - v) v]/ V_r

[(V_r + v) v]/ V_r