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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
In case of condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is _________ the atmospheric pressure.

Equal to
Lower than
None of these
Higher than

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Steam Boilers, Engines, Nozzles and Turbines
A condenser in a steam power plant

Increases expansion ratio of steam
All of these
Reduces temperature of exhaust steam
Reduces back pressure of steam

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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
Presence of moisture in fuel oil would

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

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following boiler is best suited to meet the fluctuating demand of steam?

Locomotive boiler
Lancashire boiler
Babcock and Wilcox boiler
Cornish boiler

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Steam Boilers, Engines, Nozzles and Turbines
The change in internal energy in steam engines equals to

Work done during compression
Work done during adiabatic expansion
Change in enthalpy
Work done during the Rankine cycle

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