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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
In an impulse turbine, steam expands

Wholly in nozzle
None of these
Partly in the nozzle and partly in blades
Wholly in blades

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Steam Boilers, Engines, Nozzles and Turbines
The maximum discharge through a chimney occurs when the height of chimney is

Equal to the height of the hot gas column producing draught
Infinitely long
Around 200 meters
Outside temperature is very low

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Steam Boilers, Engines, Nozzles and Turbines
Expansion ratio is the ratio of

Swept volume to the clearance volume
Clearance volume to the swept volume
Swept volume to the volume at cut-off
Volume at cut-off to the swept volume

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Steam Boilers, Engines, Nozzles and Turbines
The function of injector used in small capacity boilers is to

Inject chemical solution in feed pump
Pump water, similar to boiler feed pump
Create vacuum
Add make up water in the system

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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)

p₂/p₁
p₁ + p₂
p₁/p₂
p₁. p₂

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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
Increases
Remain unaffected
Decreases

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MORE MCQ ON Steam Boilers, Engines, Nozzles and Turbines

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