Steam Boilers, Engines, Nozzles and Turbines
A compound steam engine in which piston rods of high pressure and low pressure cylinders are attached to two different cranks set at 90° to each other, is called

Woolf type compound engine
Receiver type compound engine
Both (A) and (B)
Tandem type compound engine

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Steam Boilers, Engines, Nozzles and Turbines
For water, at pressures below atmospheric;

Melting point drops slightly and boiling point drops slightly
Melting point drops slightly and boiling point drops markedly
Melting point rises slightly and boiling point drops markedly
Melting point rises markedly and boiling point drops markedly

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Steam Boilers, Engines, Nozzles and Turbines
Blow off cock in a boiler is used to

Increase the temperature of saturated steam without raising its pressure
Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
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

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