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

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Steam Boilers, Engines, Nozzles and Turbines
The cylindrical shell of a Lancashire boiler has diameter from

1.5 to 2.5 m
1.75 to 2.75 m
1.25 to 2.25 m
1 to 2 m

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Steam Boilers, Engines, Nozzles and Turbines
The shell of the Cochran boiler is made hemispherical

To give maximum space and strength
Both (A) and (B)
None of these
To withstand the pressure of steam inside the boiler

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Steam Boilers, Engines, Nozzles and Turbines
A compound steam engine in which piston rods of high pressure and low pressure cylinders are attached to two different cranks set at 90° to each other, is called

Receiver type compound engine
Woolf type compound engine
Both (A) and (B)
Tandem type compound engine

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Steam Boilers, Engines, Nozzles and Turbines
In a compound steam engine, the first stage of expansion is carried out in a high pressure cylinder whereas the last expansion is completed in low pressure cylinder. The diameter of high pressure cylinder is _________ the low pressure cylinder.

More than
Equal to
Less than
None of the listed here

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Steam Boilers, Engines, Nozzles and Turbines
The temperature of flue gases at air heater outlet should be

100°C
Less than wet bulb temperature of flue gases
Below dew point temperature of flue gases
Above dew point temperature of flue gases

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