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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The diameter of a cylindrical shell of a Scotch marine boiler varies from

3.5 to 4.5 m
None of these
1.5 to 2 m
2.5 to 3.5 m

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure gives the velocity of steam at the throat

More than the velocity of sound
Less than the velocity of sound
None of these
Equal to the velocity of sound

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Steam Boilers, Engines, Nozzles and Turbines
The device attached to the steam chest for preventing explosions due to excessive internal pressure of steam is called

Fusible plug
Water level indicator
Safety valve
Pressure gauge

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Steam Boilers, Engines, Nozzles and Turbines
In case of condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is _________ the atmospheric pressure.

Equal to
Lower than
None of these
Higher than

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio for gases is

0.577
0.528
0.546
0.582

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Steam Boilers, Engines, Nozzles and Turbines
An economiser is installed in a boiler primarily to

Increase steam pressure
Reduce fuel consumption
All of the listed here
Superheat the steam

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