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

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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.

131) In a receiver type compound engine, the high pressure and low pressure cylinders

Answer is:

have separate piston rods

132) The damper in a steam boiler is provided to control the draught (i.e. rate of flow of air) and thus regulate the rate of generation of steam.

Answer is:

Correct

133) The clearance in the engine cylinder

Answer is:

all of these

Explanation:

The clearance in the engine cylinder
* increases the mean effective pressure
* increases the workdone
* decreases the efficiency of the engine

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