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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
On Mollier chart, flow through turbine is represented by

Vertical straight line
Curved line
Horizontal straight line
Straight inclined line

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Steam Boilers, Engines, Nozzles and Turbines
In order to reduce the rotor speed of an impulse turbine, the method employed is

Pressure-velocity compounding
All of these
Pressure compounding
Velocity compounding

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Steam Boilers, Engines, Nozzles and Turbines
The pressure of reheat steam after passing through reheater compared to inlet condition is

More
May be more or less depending on capacity of reheater
Equal
Less

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Steam Boilers, Engines, Nozzles and Turbines
The fire tubes in a Cochran boiler usually have _________ diameter.

92.5 mm
62.5 mm
72.5 mm
6.25 mm

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

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

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Steam Boilers, Engines, Nozzles and Turbines
The isentropic enthalpy drop in moving blade is two-third of the isentropic enthalpy drop in fixed blades of a turbine. The degree of reaction will be

1.67
0.56
0.67
0.4

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