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Steam Boilers, Engines, Nozzles and Turbines

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

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

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Steam Boilers, Engines, Nozzles and Turbines
Water boils when its vapor pressure

Equals that of the surroundings
Equals the pressure of water in the container
Equals to atmospheric pressure
Equals 760 mm of mercury

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Steam Boilers, Engines, Nozzles and Turbines
A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as

Stop valve
Blow off cock
Superheater
Fusible plug

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Steam Boilers, Engines, Nozzles and Turbines
Expanding steam to a very low pressure (high vacuum) in steam engines is

Uneconomical
Economical
Desirable
Essential

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Steam Boilers, Engines, Nozzles and Turbines
An ideal regenerative cycle is

More than Carnot cycle
Equal to Carnot cycle
Could be anything
Less than Carnot cycle

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Steam Boilers, Engines, Nozzles and Turbines
A safety valve mainly used with locomotive and marine boilers is

Dead weight safety valve
Spring loaded safety valve
Lever safety valve
High steam and low water safety valve

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