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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Calorific value of coal is of the order of

2000-4000 kcal/ kg
200-400 kcal/ kg
800-1200 kcal/ kg
5000-8000 kcal/ kg

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Steam Boilers, Engines, Nozzles and Turbines
The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop

Is unpredictable
Remains the same
Decreases
Increases

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Steam Boilers, Engines, Nozzles and Turbines
The friction present between the steam and the nozzle surfaces reduces the heat drop by

10 to 15%
15 to 25%
25 to 40%
40 to 60%

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Steam Boilers, Engines, Nozzles and Turbines
The pressure of steam __________ while flowing through a nozzle.

None of these
Decreases
Increases
Remains constant

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Steam Boilers, Engines, Nozzles and Turbines
The impulse turbine rotor efficiency will have a maximum value of 0.5 cos 2α, where α is the nozzle exit flow angle, if the

Blade solidity is 0.65
Blades are equiangular
Blade velocity coefficient is unity
Blades are equiangular and frictionless

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the clearance volume to the swept volume is called

Cut-off ratio
Clearance ratio
Expansion ratio
None of these

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MORE MCQ ON Steam Boilers, Engines, Nozzles and Turbines

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