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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
In locomotives, the draught is produced by

Chimney
Steam jet draught
Both combined (A) and (B)
Induced draft fan

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Steam Boilers, Engines, Nozzles and Turbines
Fusible plug for boilers is made of fusible metal containing tin, lead, and

Nickel
Copper
Bismuth
Aluminium

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Steam Boilers, Engines, Nozzles and Turbines
The difference of supersaturated temperature and saturation temperature at that pressure is called

Degree of superheat
Degree of under-cooling
None of the listed here
Degree of super-saturation

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Steam Boilers, Engines, Nozzles and Turbines
Thermal efficiency of well maintained boiler will be of the order

0.75
0.4
0.5
0.9

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Steam Boilers, Engines, Nozzles and Turbines
The diameters of fire tubes and superheater tubes in locomotive boiler are

65.5 mm, 210 mm
24.5 mm, 65 mm
47.5 mm, 130 mm
32.5 mm, 180 mm

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Steam Boilers, Engines, Nozzles and Turbines
A supercritical boiler is one that operates above the pressure and temperature of following values

218 kg/cm² abs and 373°C
1 kg/cm² and 100°C
100 kg/cm² and 540°C
218 kg/cm² abs and 540°C

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