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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
If the critical pressure ratio for steam is 0.546, then the steam is initially

Wet steam
None of these
Dry saturated steam
Superheated steam

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Steam Boilers, Engines, Nozzles and Turbines
In order to compare the capacity of boilers, the feed water temperature and working pressure are taken as

50°C and normal atmospheric pressure
50°C and 1.1 bar pressure
100°C and normal atmospheric pressure
100°C and 1.1 bar pressure

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Steam Boilers, Engines, Nozzles and Turbines
In a steam condenser, the partial pressure of steam and air are 0.06 bar and 0.007 bar respectively. The condenser pressure is

0.067 bar
0.06 bar
0.007 bar
0.053 bar

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Steam Boilers, Engines, Nozzles and Turbines
Water boils when its vapor pressure

Equals 760 mm of mercury
Equals that of the surroundings
Equals to atmospheric pressure
Equals the pressure of water in the container

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Steam Boilers, Engines, Nozzles and Turbines
Film boiling occurs at

Atmospheric pressures
Medium pressures
Very high pressures
Very low pressure

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Steam Boilers, Engines, Nozzles and Turbines
A supercritical boiler is one that operates above the pressure and temperature of following values

218 kg/cm² abs and 540°C
218 kg/cm² abs and 373°C
1 kg/cm² and 100°C
100 kg/cm² and 540°C

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