Steam Nozzles and Turbines - Mechanical Engineering Questions and Answers

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Which of the following is a water tube boiler?

Locomotive boiler

Cochran boiler

Cornish boiler

Babcock and Wilcox boiler

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In water tube boilers

Water passes through the tubes which are surrounded by flames and hot gases

The flames and hot gases pass through the tubes which are surrounded by water

Forced circulation takes place

None of these

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A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are

Supplied by same manufacturer loose and assembled at site

Supplied mounted on a single base

Purchased from several parties and packed together at site

Packaged boiler does not exist

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The biggest size of thermal power unit operating in India is

30 MW

60 MW

100 MW

500 MW

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The critical pressure ratio for gases is

0.528

0.546

0.577

0.582

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By compounding the expansion of steam in two or more cylinders, the ratio of expansion

Does not change

Increases

Decreases

None of these

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When the total heat of steam is h kJ/kg and the sensible heat of feed water is hf1 kJ/kg, then the factor of evaporation is given by

(h - hf1)/2257

(h + hf1)/2257

(h × hf1)/2257

None of these

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The effect of super-saturation is that the

Mass of the steam discharged increases

Entropy and specific volume of the steam increases

Exit velocity of steam reduces

All of these

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The steam temperature with increase in load in case of a boiler fitted with radiation superheater

Increases

Decreases

Remain unaffected

First increases and then decreases