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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
In case of condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is _________ the atmospheric pressure.

Lower than
Higher than
None of these
Equal to

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Steam Boilers, Engines, Nozzles and Turbines
The blade friction in the impulse turbine reduces the velocity of steam by __________ while it passes over the blades.

15 to 20%
10 to 15%
30 to 40%
20 to 30%

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Steam Boilers, Engines, Nozzles and Turbines
During storage, the heating value of coal

Increases
May increase or decrease depending upon the method of storage
Decreases
Remain constant

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Steam Boilers, Engines, Nozzles and Turbines
Hard coke is produced by carburization of coal at

Atmospheric temperature
700-850°C
500-600°C
950-1100°C

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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

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

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Steam Boilers, Engines, Nozzles and Turbines
The effect of bleeding is that

Boiler is supplied with hot water
All of these
It decreases the power developed by the turbine
It increases the thermodynamic efficiency of the turbine

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