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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)

Increases
None of these
Decreases
Remains constant

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Steam Boilers, Engines, Nozzles and Turbines
In forced circulation steam boilers, the force is applied

To drain off the water
All of these
To draw water
To circulate water

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Steam Boilers, Engines, Nozzles and Turbines
The length of Cornish boiler varies from

2 to 4.5 m
3 to 5 m
7 to 9 m
5 to 7.5 m

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following is correct? (Where pa = Actual mean effective pressure, pm = Theoretical mean effective pressure, and K = Diagram factor)

pa = pm/K
pa = pm + K
pa = K/pm
pa = pm × K

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Steam Boilers, Engines, Nozzles and Turbines
Presence of moisture in fuel oil would

Because sputtering, possibly extinguishing flame
Clean the nozzles
Keep the burner tips cool
Aid in proper combustion

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Steam Boilers, Engines, Nozzles and Turbines
Stage efficiency is also known as

Diagram efficiency
Gross efficiency
None of these
Nozzle efficiency

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