STEAM BOILERS, ENGINES, NOZZLES AND TURBINES QUIZ

The ratio of the useful heat drop to the isentropic heat drop is called

Nozzle efficiency

Boiler efficiency

Vacuum efficiency

Condenser efficiency

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All steam engines work on

First law of thermodynamics

None of the listed here

Second law of thermodynamics

Zeroth law of thermodynamics

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A device used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit, is called

Stop valve

Superheater

None of these

Blow off cock

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Which is not correct statement about the function of furnace?

Mix fuel with air and ignite

To provide proper conditions for continuous complete combustion

Maintain heat supply to prepare and ignite the incoming fuel

Separate ash from coal

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The numbers of fire tubes in a Cochran boiler are

115

165

75

225

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Pick up the wrong statement about water tube boiler in comparison to fire tube boilers

Former occupies less space for same power

Rate of steam flow is more in former case

Chances of explosion are less in former case

Former is used for high installed capacity

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The shell diameter and length of locomotive boiler are

1.5 m, 6 m

1 m, 4 m

1.5 m, 4 m

2 m, 4 m

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Gradually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of

Higher effectiveness of boiler

Fouling of heat transfer surfaces

Raising of steam temperature

High calorific value coal being burnt

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The efficiency of a boiler is defined as

None of these

Ratio of the mass of steam produced to the mass of total water supplied in a given time

Ratio of heat actually used in producing steam to the heat liberated in the furnace

Ratio of the heat liberated in the furnace to the heat actually used in producing steam

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Which of the following statement is correct for steam turbines as compared to reciprocating steam engines?

All of these

The steam consumption is less

A steam turbine develops higher speeds

The efficiency of steam turbine is higher

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