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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Fire tube boilers are limited to a maximum design working pressure of

1 kg/cm
100 kg/cm²
17 kg/cm²
6 kg/cm

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the workdone on the blades to the energy supplied to the blades, is called

Gross or stage efficiency
Blading efficiency
Mechanical efficiency
Nozzle efficiency

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Steam Boilers, Engines, Nozzles and Turbines
The latent heat of steam with increase of pressure

Increases
Decreases
Remain same
Behaves unpredictably

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

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

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Steam Boilers, Engines, Nozzles and Turbines
Lancashire boiler is

All of these
Stationary fire tube boiler
Horizontal boiler
Internally fired boiler

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Steam Boilers, Engines, Nozzles and Turbines
The artificial draught is produced by

Centrifugal fan
Steam jet
Chimney
Both (A) and (B)

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