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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The discharge is __________ at critical pressure.

Maximum
Minimum
Zero
None of these

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Steam Boilers, Engines, Nozzles and Turbines
The draught in locomotive boilers is produced by a

Chimney
Steam jet
None of these
Centrifugal fan

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Steam Boilers, Engines, Nozzles and Turbines
Calorific value of coal is of the order of

200-400 kcal/ kg
5000-8000 kcal/ kg
2000-4000 kcal/ kg
800-1200 kcal/ kg

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Steam Boilers, Engines, Nozzles and Turbines
Relative percentage of heat absorbed through the heat transfer of (i) Furnace water wall (ii) Boiler tank (iii) Superheater (iv) Economizer (v) Air-heater of a typical boiler of 200 MW capacity would be of the order of

7 : 15 : 20 : 10 : 48
48 : 20 : 15 : 7 : 10
10 : 7 : 15 : 20 : 48
20 : 48 : 7 : 15 : 10

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Steam Boilers, Engines, Nozzles and Turbines
Incomplete combustion can be best judged by

Excess air in flue gases
Smoky chimney exit
Measuring temperature of flue gases at exit of furnace
Measuring carbon monoxide in flue gases

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Steam Boilers, Engines, Nozzles and Turbines
In a glass tube type water indicator for a boiler, one end of the tube is connected to water space and the other end is connected to

Chimney
Steam space
Superheater
Water space also

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