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Steam Boilers, Engines, Nozzles and Turbines

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

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

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

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Steam Boilers, Engines, Nozzles and Turbines
By compounding the expansion of steam in two or more cylinders, the ratio of expansion

Increases
None of these
Does not change
Decreases

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of brake power to the indicated power is known as

Indicated thermal efficiency
Mechanical efficiency
Overall efficiency
Brake thermal efficiency

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Steam Boilers, Engines, Nozzles and Turbines
Steam in water tube boiler as compared to fire tube boiler

Can be raised rapidly
Is raised at same rate
Is raised at slower rate
Could be raised at fast/slow rate depending on design

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Steam Boilers, Engines, Nozzles and Turbines
Multi-stage steam turbines are of the

Reaction type
Pressure compounded type
Velocity compounded type
All of these

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MORE MCQ ON Steam Boilers, Engines, Nozzles and Turbines

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