Steam Boilers, Engines, Nozzles and Turbines
Clearance ratio is the ratio of

Volume at cut-off to the swept volume
Clearance volume to the volume at cut-off
Clearance volume to the swept volume
Swept volume to the clearance volume

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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
All of these
To determine the generating capacity of the boiler

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