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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

Surface condenser
Barometric condenser
Evaporative condenser
Jet condenser

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio for initially dry saturated steam is

0.582
0.546
0.601
0.577

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Steam Boilers, Engines, Nozzles and Turbines
For the same length of stroke and speed of crankshaft, the piston speed for a double acting steam engine is _________ the piston speed of single acting steam engine.

Three times
Equal to
Four times
Twice

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Steam Boilers, Engines, Nozzles and Turbines
Latent heat of dry steam at atmospheric pressure is equal to

539 BTU/ lb
427 kcal/ kg
539 kcal/ kg
100 kcal/ kg

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the work-done on the blades per kg of steam to the total energy supplied per stage per kg of steam is called

Nozzle efficiency
Stage efficiency
Blading efficiency
Mechanical efficiency

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

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