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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height of the chimney in meters, and T1 = Absolute temperature of air outside the chimney in K)

T1 /176.5H
176.5H/T1
T1 /88.25H
88.25H/T1

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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)

Decreases
Remains constant
None of these
Increases

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Steam Boilers, Engines, Nozzles and Turbines
The friction present between the steam and the nozzle surfaces reduces the heat drop by

10 to 15%
15 to 25%
25 to 40%
40 to 60%

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of heat utilized to produce steam and the heat liberated in furnace is known as

Boiler evaporative capacity
Boiler efficiency
Boiler effectiveness
Factor of evaporation

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Steam Boilers, Engines, Nozzles and Turbines
Caking coals are those which

Burn completely
Form lumps or masses of coke
Show little or no fusing action
Burn freely

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Steam Boilers, Engines, Nozzles and Turbines
The draught in locomotive boilers is produced by a

None of these
Centrifugal fan
Chimney
Steam jet

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