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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The numbers of fire tubes in a Cochran boiler are

225
75
115
165

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Steam Boilers, Engines, Nozzles and Turbines
The high steam and low water safety valve is not used in

Cornish boiler
Locomotive boiler
Cochran boiler
Lancashire boiler

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Steam Boilers, Engines, Nozzles and Turbines
For maximum discharge through a chimney, the condition is that height of hot gas column producing the draught should be

Two times the height of chimney
One-half the height of chimney
Four times the height of chimney
Equal to the height of chimney

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Steam Boilers, Engines, Nozzles and Turbines
In a glass tube type water indicator for a boiler, one end of the tube is connected to water space and the other end is connected to

Water space also
Superheater
Chimney
Steam space

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

sin²α
cot²α
tan²α
cos²α

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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
Increases
Decreases

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