STEAM BOILERS, ENGINES, NOZZLES AND TURBINES QUIZ

The best suited coal for chain or traveling grate stoker boiler is

Non-coking or free burning coal

High sulphur coal

Coking coal

Pulverized coal

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For the same diameter and thickness of tube, a water tube boiler has ________ heating surface as compared to fire tube boiler.

Less

More

Equal

None of these

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Coke is produced by

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

Enriching carbon in the coal

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

Pulverizing coal in inert atmosphere

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The maximum heat loss is a boiler occurs due to

Dry flue gases

Unburnt carbon

Steam formation

Moisture in fuel

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The principal function of a stop valve is to

Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit

Increase the temperature of saturated steam without raising its pressure

Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler

Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required

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A device used to increase the temperature of saturated steam without raising its pressure, is called

Blow off cock

Superheater

Stop valve

Fusible plug

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On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by

Vertical straight line

Straight inclined line

Horizontal straight line

Curved line

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The high pressure and low pressure cylinders in a Woolf type compound engine are regarded as having cranks

None of these

0° to each other

90° to each other

180° to each other

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

Increases

Decreases

None of these

Does not change

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The pressure compounded impulse turbine as compared to velocity compounded turbine require __________ number of stages.

Less

None of these

More

Same

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