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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The performance of a boiler is measured by the

Steam produced in kg/h
Amount of water evaporated per hour
All of the listed here
Steam produced in kg/kg of fuel burnt

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Steam Boilers, Engines, Nozzles and Turbines
There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called

Cushion steam
Wet steam
Superheated steam
Saturated steam

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Steam Boilers, Engines, Nozzles and Turbines
The efficiency of the plant __________ with the mechanical draught.

Increases
Decreases
Remains constant
None of these

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Steam Boilers, Engines, Nozzles and Turbines
If partial pressure of air and steam be ‘pa’ and ‘ps’ respectively in a condenser, then according to Dalton's law, the pressure in condenser is equal to

None of these
pa - ps
ps - pa
pa + ps

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Steam Boilers, Engines, Nozzles and Turbines
Primary air is the air used to

Transport and dry the coal
Air delivered by forced draft fan
Convert CO (formed in lower zone of furnace) into CO₂ at higher zone
Provide air around burners for obtaining optimum combustion

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Steam Boilers, Engines, Nozzles and Turbines
At critical point, i.e. p=225.65 kg/cm², the latent enthalpy of vaporisation is

Depends on temperature also
Minimum
Zero
Maximum

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