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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The ratio of total useful heat drop to the total isentropic heat drop, is called

Stage efficiency
Rankine efficiency
None of these
Internal efficiency

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Steam Boilers, Engines, Nozzles and Turbines
During polytropic process

Steam may be wet, dry or superheated after expansion
Work is done
All of these
Heat transfer takes place across cylinder walls

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Steam Boilers, Engines, Nozzles and Turbines
In water wall furnace, the heat is transferred to the water walls by

Convection
Conduction
Radiation and conduction
Radiation

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

Increases
Decreases
None of these
Remains constant

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Steam Boilers, Engines, Nozzles and Turbines
The change in internal energy in steam engines equals to

Work done during compression
Work done during the Rankine cycle
Work done during adiabatic expansion
Change in enthalpy

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Steam Boilers, Engines, Nozzles and Turbines
Which is not correct statement about pulverized fuel firing?

Fuel burns economically
Heat release can be easily controlled
It is the best technique for burning high ash content fuel having low fusion ash
High burning rate is possible

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