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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
Safety valve
Water level indicator
Fusible plug

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Steam Boilers, Engines, Nozzles and Turbines
A device used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit, is called

Blow off cock
Superheater
None of these
Stop valve

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Steam Boilers, Engines, Nozzles and Turbines
The fire tubes in a Cochran boiler usually have _________ diameter.

72.5 mm
92.5 mm
62.5 mm
6.25 mm

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Steam Boilers, Engines, Nozzles and Turbines
The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)

Vb = V² cosα
Vb = 0.5 V² cosα
Vb = 0.5 V cosα
Vb = V cosα

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Steam Boilers, Engines, Nozzles and Turbines
The relative heat absorption for successively added equal areas of boiler convection heating surfaces

First increases and then decreases
Remain unaffected
Decreases
Increases

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Steam Boilers, Engines, Nozzles and Turbines
A wet vapor can be completely specified by

Temperature only
Pressure only
Pressure and dryness fraction
Dryness fraction only

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