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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Latent heat of dry steam at atmospheric pressure is equal to

427 kcal/ kg
100 kcal/ kg
539 kcal/ kg
539 BTU/ lb

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Steam Boilers, Engines, Nozzles and Turbines
The high steam and low water safety valve is used to blow off steam when the

Steam pressure exceeds the working pressure
Both (A) and (B)
None of these
Water level in the boiler becomes too low

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Steam Boilers, Engines, Nozzles and Turbines
The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop

Increases
Is unpredictable
Remains the same
Decreases

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called

Condenser efficiency
Vacuum efficiency
Boiler efficiency
Nozzle efficiency

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Steam Boilers, Engines, Nozzles and Turbines
Lancashire boiler is a

Mobile fire tube boiler
Stationary water tube boiler
Water tube boiler with natural/forced circulation
Stationary fire tube boiler

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Steam Boilers, Engines, Nozzles and Turbines
In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be

0.63
0.74
0.56
0.78

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