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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
A valve installed between the boiler and the feed pump is

Blow off cock
Feed check valve
Steam stop valve
None of these

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the energy required to produce the artificial draught (expressed in meters head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as

Efficiency of the chimney
Efficiency of the boiler
Efficiency of the fan
Power of the boiler

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio is given by (where p₁ = Initial pressure of steam, and p₂ = Pressure of steam at throat or critical pressure)

p₁. p₂
p₁/p₂
p₁ + p₂
p₂/p₁

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Steam Boilers, Engines, Nozzles and Turbines
A condenser in a steam power plant

Reduces temperature of exhaust steam
All of these
Reduces back pressure of steam
Increases expansion ratio of steam

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Steam Boilers, Engines, Nozzles and Turbines
The amount of water evaporated from feed water at _________ into dry and saturated steam at 100° C at normal atmospheric pressure is called equivalent evaporation from and at 100° C.

60°C
0°C
40°C
100°C

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

Inclined
Horizontal
Vertical
None of the listed here

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