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Steam Boilers, Engines, Nozzles and Turbines

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

Joule cycle
Brayton cycle
Stirling cycle
Carnot cycle

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Steam Boilers, Engines, Nozzles and Turbines
An impulse turbine as compared to a reaction turbine, for a given power has _________ row of blades.

None of these
More
Less
Equal

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Steam Boilers, Engines, Nozzles and Turbines
The amount of water evaporated in kg per kg of fuel burnt is called

Equivalent evaporation from and at 100° C
Evaporative capacity of a boiler
None of these
Boiler efficiency

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Steam Boilers, Engines, Nozzles and Turbines
The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)

Vb = V² cosα
Vb = 0.5 V² cosα
Vb = 0.5 V cosα
Vb = V cosα

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

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Steam Boilers, Engines, Nozzles and Turbines
In order to obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will

Improve
Worsen
May improve/worsen depending on size
Remain unaffected

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