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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
One kilowatt-hour energy is equivalent to

1000 J
360 kJ
3600 kJ
3600 kW/sec

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

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Steam Boilers, Engines, Nozzles and Turbines
The fire tubes in, a Coarran and Scottish marine boiler are

Inclined
Vertical
Both horizontal and vertical
Horizontal

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

cos²α
tan²α
sin²α
cot²α

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Steam Boilers, Engines, Nozzles and Turbines
A safety valve mainly used with locomotive and marine boilers is

Dead weight safety valve
Spring loaded safety valve
Lever safety valve
High steam and low water safety valve

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Steam Boilers, Engines, Nozzles and Turbines
On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by

Curved line
Vertical straight line
Straight inclined line
Horizontal straight line

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MORE MCQ ON Steam Boilers, Engines, Nozzles and Turbines

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