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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
In a receiver type compound engine, the high pressure and low pressure cylinders

Have separate piston rods
Are set at 90°
Have common piston rod
Are set in V-arrangement

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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

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

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Steam Boilers, Engines, Nozzles and Turbines
Maximum energy loss in a boiler occurs due to

Unburnt carbon in ash
Flue gases
Incomplete combustion
Ash content

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Steam Boilers, Engines, Nozzles and Turbines
Steam engine operates on

Carnot cycle
Brayton cycle
Joule cycle
Stirling cycle

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Steam Boilers, Engines, Nozzles and Turbines
An economiser _________ the steam raising capacity of a boiler.

Decreases
Has no effect on
None of these
Increases

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Steam Boilers, Engines, Nozzles and Turbines
The overall efficiency of thermal power plant is

All the three above plus gas cycle efficiency
Boiler efficiency, turbine efficiency, generator efficiency
Regenerative cycle efficiency
Carnot cycle efficiency

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