Hydraulic Machines Mcqs

This set of Mechanical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Hydraulic Machines ”. These questions are chosen from a collection of most authoritative and best reference books on Mechanical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Hydraulic Machines comprehensively.

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1.
The efficiency of a centrifugal pump is maximum when its blades are__________________?

Straight

Bent forward

Bent backward

Bent forward first and then backward

2.
When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be__________________?

Horizontal

Nearly horizontal

Steep

First rise and then fall

3.
If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge_____________________?

Same quantity of liquid

0.75 Q

Q/0.75

1.5 Q

4.
The optimum value of vane exit angle for a centrifugal pump impeller is_________________?

10-15°

20-25°

30-40°

50-60°

5.
In centrifugal pumps, maximum efficiency is obtained when the blades are_________________?

Straight

Bent forward

Bent backward

Radial

6.
In a centrifugal pump, the liquid enters the pump__________________?

At the top

At the bottom

At the center

From sides

7.
Low specific speed of a pump implies it is____________________?

Centrifugal pump

Mixed flow pump

Axial flow pump

Any one of the above

8.
For small discharge at high pressure, following pump is preferred_____________________?

Centrifugal

Axial flow

Mixed flow

Propeller

Reciprocating

9.
The horse power required in above case will be___________________?

Same

0.75 B.H.P.

B.H.P./0.75

1.5 B.H.P.

10.
Motion of a liquid in a volute casing of a centrifugal pump is an example of____________________?

Rotational flow

Radial

Forced spiral vortex flow

Forced cylindrical vortex flow

Spiral vortex flow

11.
Medium specific speed of a pump implies it is_________________?

Centrifugal pump

Mixed flow pump

Axial flow pump

Any one of the above

12.
Indicator diagram of a reciprocating pump is a graph between________________?

Flow vs swept volume

Pressure in cylinder vs swept volume

Flow vs speed

Pressure vs speed

13.
Any change in load is adjusted by adjusting following parameter on turbine______________?

Net head

Absolute velocity

Blade velocity

Flow

14.
The maximum number of jets generally employed in impulse turbine without jet interference is________________?

4

6

8

12

15.
High specific speed of turbine implies it is__________________?

Propeller turbine

Francis turbine

Impulse turbine

Any one of the above

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