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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
At very low temperature, the melting and boiling temperatures become equal. This temperature is

373°K
0°K
273.16°K
303°K

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio (p₂/p₁) is given by

(p₂/p₁) = [(n - 1)/2] n + (1/n)
(p₂/p₁) = [2/(n + 1)] n/(n-1)
(p₂/p₁) = [2/(n - 1)] n/(n + 1)
(p₂/p₁) = [(n + 1)/2] n - (1/n)

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Steam Boilers, Engines, Nozzles and Turbines
The average operating pressure of Benson boiler is

200 bar
100 bar
150 bar
250 bar

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Steam Boilers, Engines, Nozzles and Turbines
For burning 1 kg of carbon to CO as per chemically correct combustion, amount of air required is

2 kg
8/3 kg
4/3 kg
1 kg

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Steam Boilers, Engines, Nozzles and Turbines
Maximum energy loss in a boiler occurs due to

Unburnt carbon in ash
Flue gases
Ash content
Incomplete combustion

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Steam Boilers, Engines, Nozzles and Turbines
In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts. and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is

0.4
0.5
0.8
0.25

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