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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Which of the following are boiler accessories?

Both (A) and (B)
Superheater
Economizer
None of these

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Steam Boilers, Engines, Nozzles and Turbines
The maximum discharge of steam through a convergent-divergent nozzle depends upon

Area of nozzle at throat
Initial pressure and volume of steam
Both (A) and (B)
Final pressure of steam leaving the nozzle

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Steam Boilers, Engines, Nozzles and Turbines
On Millier chart, the constant pressure lines

Diverge from right to left
Are equally spaced throughout
Diverge from left to right
First rise up and then fall

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Steam Boilers, Engines, Nozzles and Turbines
The working pressure range for a LaMont boiler is

3.5 to 20 MN/m²
0.5 to 10 MN/m²
1 to 15 MN/m²
2.5 to 15 MN/m²

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Steam Boilers, Engines, Nozzles and Turbines
In a nozzle, the effect of super-saturation is to

Increase the heat drop
Decrease dryness fraction of steam
Increase the entropy
Decrease specific volume of steam

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Steam Boilers, Engines, Nozzles and Turbines
The economiser is used in boilers to

Increase thermal efficiency of boiler
Economize on fuel
Increase flue gas temperature
Extract heat from the exhaust flue gases

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