Steam Nozzles and Turbines - Mechanical Engineering Questions and Answers

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Benson boiler requires

No drum

One drum

Two drums

Three drums

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Sulphur in coal results in

Corroding air heaters

Spontaneous combustion during coal storage

Facilitating ash precipitation

All of the above

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In an impulse turbine

The steam is expanded in nozzles only and there is a pressure drop and heat drop

The steam is expanded both in fixed and moving blades continuously

The steam is expanded in moving blades only

The pressure and temperature of steam remains constant

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The state of vapor under saturation condition is described by

Pressure alone

Temperature alone

Pressure and temperature

Pressure and dryness fraction

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With increase in load, convection superheater has

Drooping characteristic

Linear characteristic

Rising characteristic

Flat characteristic

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O₂ content in atmospheric air on volume basis is

21 %

23 %

30 %

40 %

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O₂ content in atmospheric air on weight basis is

21 %

23 %

30 %

40 %

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The balanced draft furnace is one using

Induced draft fan and chimney

Induced draft fan and forced draft fan

Forced draft fan and chimney

Any one of the above

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The ratio of heat actually used in producing the steam to the heat liberated in the furnace, is known as

Equivalent evaporation

Factor of evaporation

Boiler efficiency

Power of a boiler