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 : 36
Multistage centrifugal pumps are used to

Give high discharge

Produce high heads

Pump viscous fluids

All of these

Question No : 37
The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is

Slow speed pump with radial flow at outlet

Medium speed pump with radial flow at outlet

High speed pump with radial flow at outlet

High speed pump with axial flow at outlet

Question No : 38
Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of

39.2 %

49.2 %

68.8 %

84.8 %

Question No : 39
Specific speed for reaction turbines ranges from

0 to 4.5

10 to 100

80 to 200

250 to 300

Question No : 40
Which of the following statement is wrong?

The reaction turbines are used for low head and high discharge.

The angle of taper on draft tube is less than 8°.

An impulse turbine is generally fitted slightly above the tail race.

A Francis turbine is an impulse turbine.

Question No : 41
Which place in hydraulic turbine is most susceptible for cavitations?

Inlet of draft rube

Blade inlet

Guide blade

Penstock

Question No : 42
The specific speed (Ns) of a centrifugal pump is given by

(N√Q)/H^2/3

(N√Q)/H^3/4

(N√Q)/H

(N√Q)/H^5/4