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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
A turbine is said to have an axial discharge when the steam leaves the blade tip at _________ to the direction of the blade motion.

90°
180°
270°
60°

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Steam Boilers, Engines, Nozzles and Turbines
The fittings mounted on the boiler for its proper and safe functioning is a

Water level indicator
Safety valve
All of these
Pressure gauge

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Steam Boilers, Engines, Nozzles and Turbines
Water boils when its vapor pressure

Equals the pressure of water in the container
Equals that of the surroundings
Equals to atmospheric pressure
Equals 760 mm of mercury

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the energy required to produce the artificial draught (expressed in meters head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as

Efficiency of the fan
Efficiency of the chimney
Power of the boiler
Efficiency of the boiler

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Steam Boilers, Engines, Nozzles and Turbines
A condenser in a steam power plant

Reduces back pressure of steam
Increases expansion ratio of steam
Reduces temperature of exhaust steam
All of these

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

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

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