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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Duplex feed pumps are used in small steam boilers. These operate on the principle of

Gear pump
Axial flow pump
Centrifugal pump
Reciprocating pump

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Steam Boilers, Engines, Nozzles and Turbines
During polytropic process

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

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the volume at cut-off to the swept volume is called

Expansion ratio
Clearance ratio
None of these
Cut-off ratio

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Steam Boilers, Engines, Nozzles and Turbines
The air pressure at the fuel bed is reduced below that of atmosphere by means of a fan placed at or near the bottom of the chimney to produce a draught. Such a draught is called

Natural draught
Induced draught
Forced draught
Balanced draught

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Steam Boilers, Engines, Nozzles and Turbines
When the total heat of steam is h kJ/kg and the sensible heat of feed water is hf1 kJ/kg, then the factor of evaporation is given by

(h + hf1)/2257
(h × hf1)/2257
(h - hf1)/2257
None of these

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Steam Boilers, Engines, Nozzles and Turbines
The difference of supersaturated temperature and saturation temperature at that pressure is called

Degree of under-cooling
Degree of superheat
None of the listed here
Degree of super-saturation

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