Steam Boilers Engines Nozzles and Turbines Mcqs

This set of Mechanical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Steam Boilers, Engines, Nozzles and Turbines ”. 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 Steam Boilers, Engines, Nozzles and Turbines comprehensively.

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1.
For water, at pressures below atmospheric___________________?

Melting point rises slightly and boiling point drops markedly

Melting point rises markedly and boiling point drops markedly

Melting point drops slightly and boiling point drops markedly

Melting point drops slightly and boiling point drops slightly

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2.
The critical pressure at which latent heat of vaporisation is zero is________________?

225.65 kgf/cm2

273 kgf/cm2

100 kgf/cm2

1 kgf/cm2

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3.
Coke is produced by__________________?

Pulverising coal in inert atmosphere

Heating wood in a limited supply of air at temperatures below 300GC

Strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel

Binding the pulverised coal into brick-etts

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5.
Equivalent evaporation is the amount of water evaporated in a boiler from and at ____________________?

0°C

100°C

Saturation temperature at given pressure

Room temperature

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6.
The equivalent evaporation of a boiler is a measure to compare _________________?

The given boiler with the model

The two different boilers of the same make

Two different makes of boilers operat¬ing under the same operating conditions

Two boilers of same make but operaing under different conditions

Any type of boilers operating under any conditions

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7.
Sublimation region is the region where__________________?

Solid and vapour phases are in equi-librium

Solid and liquid phases are in equilibrium

Liquid and vapour phases are in equilibrium

Solid, liquid and vapour phases are in equilibrium

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8.
One kg of steam sample contains 0.8 kg dry steam; it’s dryness fraction is__________________?

0.2

0.8

1.0

0.6

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9.
The specific heat of superheated steam in kcal/kg is generally of the order of___________________?

0.1

0.3

0.5

0.8

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10.
A wet vapour can be completely specified by__________________?

Pressure only

Temperature only

Dryness fraction only

Specific volume only

Pressure and dryness fraction

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11.
On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by_______________?

Horizontal straight line

Vertical straight line

Straight inclined line

Curved line

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12.
The dry saturated steam at very low pressure, (5-10 kg/cm2) when throttled to atmosphere will become________________?

Wet

Superheated

Remain dry satruated

Dry

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13.
The dry saturated steam at very high pressure (150-200 kg/cm2) when throttled to atmosphere will become_______________?

Wet

Superheated

Remain dry saturated

Dry

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14.
In a throttling process_________________?

Heat transfer takes place

Work is done by the expanding steam

Internal energy of steam changes

All of the above

None of the above

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15.
Latent heat of dry steam at atmospneric pressure is equal to____________________?

539 kcal/kg

539 BTU/lb

427 kcal/kg

100 kcal/kg

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