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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The safety valve on boiler drum compared to safety valve on superheater is set at

Same value
Higher value
Lower value
Lower/higher depending on steam flow

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

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Steam Boilers, Engines, Nozzles and Turbines
In impulse turbines, when friction is neglected, the relative velocity of steam at outlet tip of the blade is _________ the relative velocity of steam at inlet tip of the blade.

None of these
Less than
Equal to
Greater than

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Steam Boilers, Engines, Nozzles and Turbines
Which is not correct statement about pulverized fuel firing?

It is the best technique for burning high ash content fuel having low fusion ash
High burning rate is possible
Fuel burns economically
Heat release can be easily controlled

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Steam Boilers, Engines, Nozzles and Turbines
The density of supersaturated steam is about __________ that of the ordinary saturated vapor at the corresponding pressure.

4 times
2 times
Same as
8 times

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Steam Boilers, Engines, Nozzles and Turbines
The diameter of cylindrical shell of the Lancashire boiler is of the order of

1 to 1.25 m
2 to 4 m
1 to 1.75 m
1.75 to 2.75 m

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