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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The maximum efficiency of a reaction turbine is

2 sin²α/(1 + sin²α)
(1 + sin²α)/2 sin²α
(1 + cos²α)/2 cos²α
2 cos²α/(1 + cos²α)

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Steam Boilers, Engines, Nozzles and Turbines
An ideal regenerative cycle is

More than Carnot cycle
Equal to Carnot cycle
Less than Carnot cycle
Could be anything

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio (p₂/p₁) is given by

(p₂/p₁) = [(n - 1)/2] n + (1/n)
(p₂/p₁) = [2/(n - 1)] n/(n + 1)
(p₂/p₁) = [2/(n + 1)] n/(n-1)
(p₂/p₁) = [(n + 1)/2] n - (1/n)

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Steam Boilers, Engines, Nozzles and Turbines
Gradually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of

Higher effectiveness of boiler
Fouling of heat transfer surfaces
Raising of steam temperature
High calorific value coal being burnt

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

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Steam Boilers, Engines, Nozzles and Turbines
The flow of steam is supersonic

In the convergent portion of the nozzle
At the throat of the nozzle
At the entrance to the nozzle
In the divergent portion of the nozzle

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MORE MCQ ON Steam Boilers, Engines, Nozzles and Turbines

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