Steam Boilers, Engines, Nozzles and Turbines
The actual vacuum in a condenser is equal to

Barometric pressure + actual pressure
Gauge pressure + atmospheric pressure
Barometric pressure - actual pressure
Gauge pressure - atmospheric pressure

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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 cost of the engine, for the same power and economy, is more than that of a simple steam engine
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

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Steam Boilers, Engines, Nozzles and Turbines
In forced circulation type boiler

Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
Feed pump is employed to supplement natural circulation in water wall type furnace
Water is converted into steam in one pass without any recirculation

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