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

Answer is:

reciprocating

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127) The water tubes in a Babcock and Wilcox boiler are

Answer is:

inclined

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

Answer is:

higher than

129) 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

Answer is:

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

130) The cut-off ratio is the reciprocal of expansion ratio,

Answer is:

Correct

Explanation:

The ratio of clearance volume to the swept volume is called clearance ratio.

The ratio of swept volume to the volume at cut-off is called expansion ratio.

The ratio of volume at cut-off to the swept volume is known as cut-off ratio. It is the reciprocal of expansion ratio.

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