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Steam Boilers, Engines, Nozzles and Turbines

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

Pressure gauge
Water level indicator
Safety valve
Fusible plug

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Steam Boilers, Engines, Nozzles and Turbines
Multi-stage steam turbines are of the

Reaction type
Pressure compounded type
Velocity compounded type
All of these

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Steam Boilers, Engines, Nozzles and Turbines
In a velocity compounded impulse turbine, when steam flows through the second row of moving blades,

Velocity increases
Velocity decreases
Pressure remains constant
Velocity remains constant

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called

Boiler efficiency
Nozzle efficiency
Condenser efficiency
Vacuum efficiency

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Steam Boilers, Engines, Nozzles and Turbines
When the circulation of water, in a boiler, is by convection currents which are set up during the heating of water, then the boiler is known as

Forced circulation boiler
Internally fired boiler
Externally fired boiler
Natural circulation boiler

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio is given by (where p₁ = Initial pressure of steam, and p₂ = Pressure of steam at throat or critical pressure)

p₁. p₂
p₁ + p₂
p₁/p₂
p₂/p₁

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