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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Fire tube boilers are limited to a maximum working pressure of

0.17 MN/m²
17 MN/m²
170 MN/m²
1.7 MN/m²

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Steam Boilers, Engines, Nozzles and Turbines
For combustion of a fuel, following is essential

Proper ignition temperature
All the three above
O₂ to support combustion
Correct fuel air ratio

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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.

Four times
Twice
Equal to
Three times

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Steam Boilers, Engines, Nozzles and Turbines
An economiser in a boiler

Increases steam pressure
Decreases fuel consumption
Decreases steam pressure
Increases steam flow

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Steam Boilers, Engines, Nozzles and Turbines
In order to obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will

Remain unaffected
Worsen
Improve
May improve/worsen depending on size

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Steam Boilers, Engines, Nozzles and Turbines
The maximum discharge of steam through a convergent-divergent nozzle depends upon

Final pressure of steam leaving the nozzle
Area of nozzle at throat
Both (A) and (B)
Initial pressure and volume of steam

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