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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)

None of these
Remains constant
Decreases
Increases

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Steam Boilers, Engines, Nozzles and Turbines
Steam turbines are used for

Large marine propulsion
Electric power generation
Direct drive of fans, compressors, pumps
All of these

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Steam Boilers, Engines, Nozzles and Turbines
An economiser in a boiler

Increases steam pressure
Decreases fuel consumption
Increases steam flow
Decreases steam pressure

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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

Fusible plug
Superheater
Stop valve
Blow off cock

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

cos²α
sin²α
cot²α
tan²α

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Steam Boilers, Engines, Nozzles and Turbines
The maximum steam pressure in a Locomotive boiler is limited to

1.8 MN/m²
18 MN/m²
180 MN/m²
0.18 MN/m²

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