Steam Boilers and Engines - Mechanical Engineering Questions and Answers

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The draught is the __________ of pressures above and below the fire grate.

sum

difference

The function of an eccentric is to provide __________ motion to the slide valve.

reciprocating

rotary

The water tubes in a Babcock and Wilcox boiler are

vertical

horizontal

inclined

In case of condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is __________ the atmospheric pressure.

equal to

lower than

higher than

Blow off cock in a boiler is used to

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

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

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

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