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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
A condenser where circulating water flows through tubes which are surrounded by steam, in known as

Barometric condenser
Jet condenser
Evaporative condenser
Surface condenser

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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

0.74
0.56
0.63
0.78

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Steam Boilers, Engines, Nozzles and Turbines
De-Laval turbines are mostly used

Where low speeds are required
For large power purposes
For small power purposes and low speeds
For small power purposes and high speeds

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Steam Boilers, Engines, Nozzles and Turbines
The maximum heat loss is a boiler occurs due to

Dry flue gases
Unburnt carbon
Moisture in fuel
Steam formation

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Steam Boilers, Engines, Nozzles and Turbines
The amount of water evaporated from feed water at _________ into dry and saturated steam at 100° C at normal atmospheric pressure is called equivalent evaporation from and at 100° C.

0°C
40°C
100°C
60°C

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Steam Boilers, Engines, Nozzles and Turbines
The diameter of fire tubes in Cochran boiler is of the order of

6 cm
12 cm
8 cm
2 cm

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