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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Latent heat of dry steam at atmospheric pressure is equal to

427 kcal/ kg
100 kcal/ kg
539 BTU/ lb
539 kcal/ kg

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Steam Boilers, Engines, Nozzles and Turbines
The fire tubes in, a Coarran and Scottish marine boiler are

Inclined
Both horizontal and vertical
Horizontal
Vertical

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

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Steam Boilers, Engines, Nozzles and Turbines
The draught produced by a steam jet issuing from a nozzle placed in the chimney is called

Induced steam jet draught
Chimney draught
Forced steam jet draught
None of these

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

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Steam Boilers, Engines, Nozzles and Turbines
Adiabatic process is

Essentially an isentropic process
Constant temperature process
Non-heat transfer process
Reversible process

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