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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The rate of discharge through the nozzle ___ when the exit pressure is gradually reduced.

Decreases
Increases
Remains same
None of the listed here

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Steam Boilers, Engines, Nozzles and Turbines
By compounding the expansion of steam in two or more cylinders, the length of stroke

Decreases
Does not change
None of these
Increases

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Steam Boilers, Engines, Nozzles and Turbines
The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity ‘V’ at inlet)

Vb = V² cos α
Vb = 0.5 V cosα
Vb = V cos α
Vb = 0.5 V² cosα

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Steam Boilers, Engines, Nozzles and Turbines
Secondary air is the air used to

Convert CO (formed in lower zone of furnace) into CO₂ at higher zone
Provide air around burners for obtaining optimum combustion
Air delivered by induced draft fan
Transport and dry the coal

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Steam Boilers, Engines, Nozzles and Turbines
The basic job of feed water treatment in boilers is to overcome the problem of

Corrosion
Carryover
All of these
Scale

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Steam Boilers, Engines, Nozzles and Turbines
In a receiver type compound engine, the high pressure and low pressure cylinders

Have common piston rod
Are set in V-arrangement
Are set at 90°
Have separate piston rods

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