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

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

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Steam Boilers, Engines, Nozzles and Turbines
The main object of a boiler trial is

To prepare heat balance sheet for the boiler
To determine the thermal efficiency of the boiler when working at a definite pressure
To determine the generating capacity of the boiler
All of these

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