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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The stage efficiency (ηS) is given by (where ηB = Blading efficiency, and ηN = Nozzle efficiency)

None of the listed here
ηS = ηB / ηN
ηS = ηN / ηB
ηS = ηB × ηN

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Steam Boilers, Engines, Nozzles and Turbines
The temperature of flue gases at air heater outlet should be

Above dew point temperature of flue gases
100°C
Below dew point temperature of flue gases
Less than wet bulb temperature of flue gases

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Steam Boilers, Engines, Nozzles and Turbines
A stage, in reaction turbine, is represented by

Each row of blades
Number of entries of steam
Number of exits of steam
Number of casing

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Steam Boilers, Engines, Nozzles and Turbines
In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p₂) will be

3.3 bar
8.2 bar
9.9 bar
5.46 bar

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Steam Boilers, Engines, Nozzles and Turbines
The high pressure and low pressure cylinders in a Tandem type compound engine are regarded as having cranks

0° to each other
90° to each other
180° to each other
None of these

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Steam Boilers, Engines, Nozzles and Turbines
Stage efficiency is also known as

Gross efficiency
Diagram efficiency
None of these
Nozzle efficiency

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