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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Sulphur content of fuels is very important to the plant operators because it

Promotes complete combustion
Retards electric precipitation
Has highly corrosive effect
Has high heating value

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Steam Boilers, Engines, Nozzles and Turbines
The function of injector used in small capacity boilers is to

Inject chemical solution in feed pump
Pump water, similar to boiler feed pump
Create vacuum
Add make up water in the system

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Steam Boilers, Engines, Nozzles and Turbines
The steam temperature with increase in load in case of a boiler fitted with radiation superheater

Increases
Decreases
Remain unaffected
First increases and then decreases

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Steam Boilers, Engines, Nozzles and Turbines
The maximum efficiency of a De-Laval turbine is (where α = Nozzle angle)

sin²α
cos²α
cot²α
tan²α

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Steam Boilers, Engines, Nozzles and Turbines
Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value

(1 + moisture content)
1 – moisture content
1 + moisture content
(1- moisture content)

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Steam Boilers, Engines, Nozzles and Turbines
For the same length of stroke and speed of crankshaft, the piston speed for a double acting steam engine is _________ the piston speed of single acting steam engine.

Three times
Equal to
Four times
Twice

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