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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The diameter of fire tube of Cornish boiler compared to its shell is

One fifth
One fourth
One half
One third

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Steam Boilers, Engines, Nozzles and Turbines
Efficiency of a thermal cycle increases by

Cooling of steam
Both (A) and (B)
Reheating of steam
Regeneration

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Steam Boilers, Engines, Nozzles and Turbines
Desecration of feed water is carried out because it reduces

Corrosion caused by oxygen
pH value of water
Cavitation of boiler feed pumps
Heat transfer coefficient

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Steam Boilers, Engines, Nozzles and Turbines
Vacuum for reciprocating steam engines compared to steam turbines is

Equal
Less
More
Could be more or less depending on the size of plant

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following is correct? (Where pa = Actual mean effective pressure, pm = Theoretical mean effective pressure, and K = Diagram factor)

pa = K/pm
pa = pm/K
pa = pm × K
pa = pm + K

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Steam Boilers, Engines, Nozzles and Turbines
In a Parson's turbine stage, blade velocity is 320 m/s at the mean radius and rotor blade exit angle is 30°. For minimum kinetic energy of the steam leaving the stage, the steam velocity at the exit of the rotor will be

640/3 m/s
640 m/s
320/3 m/s
160/3 m/s

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