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Mechanical Engineering
Steam Boilers, Engines, Nozzles And Turbines
Quiz 17
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Q.1
The density of supersaturated steam is about __________ that of the ordinary saturated vapor at the corresponding pressure.
Same as
2 times
4 times
8 times
Q.2
A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is known as
Superheater
Air-preheater
Economizer
Injector
Q.3
The ratio of brake power to the indicated power is known as
Mechanical efficiency
Overall efficiency
Indicated thermal efficiency
Brake thermal efficiency
Q.4
The ratio of the isentropic heat drop to the heat supplied, is called
Reheat factor
Stage efficiency
Internal efficiency
Rankine efficiency
Q.5
The stage efficiency (ηS) is given by (where ηB = Blading efficiency, and ηN = Nozzle efficiency)
ηS = ηB × ηN
ηS = ηB / ηN
ηS = ηN / ηB
None of these
Q.6
The dry saturated steam at very low pressure, (510 kg/cm²) when throttled to atmosphere will become
Wet
Superheated
Remain dry saturated
Dry
Q.7
The dry saturated steam at very high pressure (150200 kg/cm²) when throttled to atmosphere will become
Wet
Superheated
Remain dry saturated
Dry
Q.8
Reheating of steam under ideal conditions takes place at constant
Entropy
Enthalpy
Pressure
Temperature
Q.9
A binary vapor plant consists of
Steam turbine
Steam condenser
Mercury boiler
All of these
0 h : 0 m : 1 s
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