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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The maximum efficiency of a reaction turbine is

(1 + cos²α)/2 cos²α
2 cos²α/(1 + cos²α)
2 sin²α/(1 + sin²α)
(1 + sin²α)/2 sin²α

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Steam Boilers, Engines, Nozzles and Turbines
The saturation temperature of steam with increase in pressure increases

Slowly first and then rapidly
Inversely
Rapidly first and then slowly
Linearly

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Steam Boilers, Engines, Nozzles and Turbines
The process of maintaining the speed of the turbine constant for various load conditions, is known as

None of these
Bleeding
Governing
Reheating

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Steam Boilers, Engines, Nozzles and Turbines
The clearance in the engine cylinder

All of these
Increases the workdone
Decreases the efficiency of the engine
Increases the mean effective pressure

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Steam Boilers, Engines, Nozzles and Turbines
A safety valve mainly used with locomotive and marine boilers is

Dead weight safety valve
High steam and low water safety valve
Lever safety valve
Spring loaded safety valve

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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

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

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