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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler

First increases and then decreases
Increases
Remain unaffected
Decreases

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Steam Boilers, Engines, Nozzles and Turbines
The pressure of steam __________ while flowing through a nozzle.

Increases
Decreases
Remains constant
None of these

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Steam Boilers, Engines, Nozzles and Turbines
A safety valve usually employed with stationary boilers is

Dead weight safety valve
All of the listed here
High steam and low water safety valve
Lever safety valve

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Steam Boilers, Engines, Nozzles and Turbines
The size of a boiler drum in pulverized fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase

Decreases
Increases/decreases depending on steam temperature requirements
Remains unchanged
Increases

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Steam Boilers, Engines, Nozzles and Turbines
The maximum efficiency of a De-Laval turbine is (where α = Nozzle angle)

sin²α
cos²α
tan²α
cot²α

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

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

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