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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31.
According to fan laws, for the fans having constant wheel diameters, the power demand varies_______________?

Directly as fan speed

Square of fan speed

Cube of fan speed

Square root of fan speed

Answer Discus (0)

32.
According to fan laws, at constant pressure, the speed capacity and power vary_________________?

Directly as the air or gas density

Inversely as square root of density

Inversely as density

As square of density

Answer Discus (0)

33.
Pressure intensifier increases the pressure in proportion to____________________?

Ratio of diameters

Square of ratio of diameters

Inverse ratio of diameters

Square of inverse ratio of diameters

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34.
According to fan laws, for fans having constant wheel diameter, the pressure varies________________?

Directly as fan speed

Square of fan speed

Cube of fan speed

Square root of fan speed

Answer Discus (0)

35.
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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36.
According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies______________________?

Directly as fan speed

Square of fan speed

Cube of fan speed

Square root of fan speed

Answer Discus (0)

37.
Which place in hydraulic turbine is most susceptible for cavitation __________________?

Inlet of draft rube

Blade inlet

Guide blade

Penstock

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38.
Specific speed for reaction turbines ranges from___________________?

0 to 4.5

10 to 100

80 to 200

250 to 300

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39.
The discharge through a reaction turbine with increase in unit speed____________________?

Increases

Decreases

Remains unaffected

First increases and then decreases

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40.
Francis, Kaplan and propeller turbines fall under the category of___________________?

Impulse turbines

Reaction turbines

Axial flow turbines

Mixed flow turbines

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41.
Francis turbine is best suited for_____________________?

Medium head application from 24 to 180 m

Low head installation up to 30 m

High head installation above 180 m

All types of heads

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42.
Impulse turbine is generally fitted______________________?

At the level of tail race

Little above the tail race

Slightly below the tail race

About 2.5 m above the tail race to avoid cavitation

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43.
In reaction turbine, draft tube is used_____________________?

To transport water downstream without eddies

To convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section

For safety of turbine

To increase flow rate

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44.
A turbine pump is basically a centrifugal pump equipped additionally with_________________?

Adjustable blades

Backward curved blades

Vaned diffusion casing

Inlet guide blades

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45.
The specific speed of turbine is defined as the speed of a unit___________________?

Of such a size that it delivers unit dis-charge at unit head

Of such a size that it delivers unit dis-charge at unit power

Of such a size that it requires unit power per unit head

Of such a size that it produces unit horse power with unit head

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