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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
A device used to heat feed water by utilizing the heat in me exhaust flue gases before leaving through the chimney, is known as

Superheater
Stop valve
Fusible plug
Economizer

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Steam Boilers, Engines, Nozzles and Turbines
Reheating of steam under ideal conditions takes place at constant

Pressure
Enthalpy
Entropy
Temperature

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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

0.78
0.56
0.74
0.63

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Steam Boilers, Engines, Nozzles and Turbines
Superheating of steam is done at

Constant entropy
Constant temperature
Constant volume
Constant pressure

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Steam Boilers, Engines, Nozzles and Turbines
The fire tubes in a Cochran boiler are

None of these
Vertical
Horizontal
Inclined

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Steam Boilers, Engines, Nozzles and Turbines
The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height of the chimney in meters, and T1 = Absolute temperature of air outside the chimney in K)

T1 /88.25H
176.5H/T1
88.25H/T1
T1 /176.5H

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