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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The maximum efficiency of a reaction turbine is

2 cos²α/(1 + cos²α)
(1 + cos²α)/2 cos²α
2 sin²α/(1 + sin²α)
(1 + sin²α)/2 sin²α

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Steam Boilers, Engines, Nozzles and Turbines
Caking coals are those which

Show little or no fusing action
Burn freely
Form lumps or masses of coke
Burn completely

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Steam Boilers, Engines, Nozzles and Turbines
In order to reduce the rotor speed of an impulse turbine, the method employed is

All of these
Pressure compounding
Pressure-velocity compounding
Velocity compounding

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Steam Boilers, Engines, Nozzles and Turbines
In reaction turbines, the axial thrust is due to

None of these
Pressure drop across the rotor
Both (A) and (B)
Change in axial velocity

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Steam Boilers, Engines, Nozzles and Turbines
Willian’s line follows the law (where b = A constant representing the shape of the Willian’s line, a = Another constant i.e. no load consumption per hour, I.P. = Indicated power, and m = Steam consumption per hour)

I.P. = a × m + b
m = a + b × I.P.
I.P. = b × m + a
m = (b/I.P.) - a

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following substance will have same percentage in both proximate and ultimate analysis?

Hydrogen
Volatile matter
Moisture
Ash

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