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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The clearance in the engine cylinder

Decreases the efficiency of the engine
All of these
Increases the workdone
Increases the mean effective pressure

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following are boiler accessories?

Superheater
None of these
Both (A) and (B)
Economizer

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Steam Boilers, Engines, Nozzles and Turbines
The pressure velocity compounded impulse turbine allows a bigger pressure drop and hence __________ numbers of stages are required.

More
Equal
Less
None of the listed here

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

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Steam Boilers, Engines, Nozzles and Turbines
The average operating pressure of Benson boiler is

200 bar
150 bar
100 bar
250 bar

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Steam Boilers, Engines, Nozzles and Turbines
Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value

1 – moisture content
1 + moisture content
(1- moisture content)
(1 + moisture content)

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