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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The discharge is __________ at critical pressure.

None of these
Zero
Maximum
Minimum

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Steam Boilers, Engines, Nozzles and Turbines
In a boiler, the heat is lost

In moisture present in the fuel
To dry flue gases
All of these
To steam formed by combustion of hydrogen per kg of fuel

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Steam Boilers, Engines, Nozzles and Turbines
For the same length of stroke and speed of crankshaft, the piston speed for a double acting steam engine is _________ the piston speed of single acting steam engine.

Three times
Four times
Equal to
Twice

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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, pā‚‚) will be

9.9 bar
8.2 bar
5.46 bar
3.3 bar

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

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

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Steam Boilers, Engines, Nozzles and Turbines
Film boiling occurs at

Very low pressure
Medium pressures
Atmospheric pressures
Very high pressures

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