Steam Boilers, Engines, Nozzles and Turbines
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
Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
Increase the temperature of saturated steam without raising its pressure
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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Steam Boilers, Engines, Nozzles and Turbines
Which of the following statement is correct for a compound steam engine?

The temperature range per cylinder is increased, with corresponding increase in condensation
The ratio of expansion is reduced, thus reducing the length of stroke
The forces in the working parts are increased as the forces are distributed over more parts
The cost of the engine, for the same power and economy, is more than that of a simple steam engine

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Steam Boilers, Engines, Nozzles and Turbines
Stoichiometric quantity of air is the

Air required for optimum combustion so as to have reasonable excess air
Air required to convert CO into CO₂
Air present in atmosphere at NTP conditions
Air required for complete combustion of fuel with no excess air

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