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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The ratio of the workdone on the blades to the energy supplied to the blades, is called

Mechanical efficiency
Gross or stage efficiency
Blading efficiency
Nozzle efficiency

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Steam Boilers, Engines, Nozzles and Turbines
The function of a cross-head is to guide motion of the _________ and to prevent it from bending.

Piston rod
Eccentric rod
Connecting rod
Valve rod

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Steam Boilers, Engines, Nozzles and Turbines
The number of drums in Benson steam generator is

One
One steam drum and one water drum
Two
No drum

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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
The diameter of flue tube in a Cornish boiler is _________ that of the shell.

One-fourth
Two-fifth
One-third
Three-fifth

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Steam Boilers, Engines, Nozzles and Turbines
Incomplete combustion can be best judged by

Measuring carbon monoxide in flue gases
Smoky chimney exit
Excess air in flue gases
Measuring temperature of flue gases at exit of furnace

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