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

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Steam Boilers, Engines, Nozzles and Turbines
A device used to increase the temperature of saturated steam without raising its pressure, is called

Superheater
Stop valve
Fusible plug
Blow off cock

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Steam Boilers, Engines, Nozzles and Turbines
In a throttling process

Steam enthalpy remains constant
Steam temperature remains constant
Steam entropy remains constant
Steam pressure remains constant

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Steam Boilers, Engines, Nozzles and Turbines
When the cross-section of a nozzle increases continuously from entrance to exit, it is called a

Convergent nozzle
Divergent nozzle
Convergent-divergent nozzle
None of these

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Steam Boilers, Engines, Nozzles and Turbines
In a Tandem type compound engine, the high pressure and low pressure cylinders

Are set at 90°
Have common piston rod
Have separate piston rods
Are set in V-arrangement

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Steam Boilers, Engines, Nozzles and Turbines
Primary air is the air used to

Provide air around burners for obtaining optimum combustion
Transport and dry the coal
Air delivered by forced draft fan
Convert CO (formed in lower zone of furnace) into CO₂ at higher zone

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