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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
A single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be

79 m/s
188 m/s
900 m/s
450 m/s

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the workdone on the blades to the energy supplied to the blades, is called

Nozzle efficiency
Blading efficiency
Gross or stage efficiency
Mechanical efficiency

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Steam Boilers, Engines, Nozzles and Turbines
Orsat meter is used for

Mass flow of the flue gases
Volumetric analysis of the flue gases
Measuring smoke density of flue gases
Gravimetric analysis of the flue gases

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

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio for initially wet steam is

0.577
0.601
0.582
0.546

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MORE MCQ ON Steam Boilers, Engines, Nozzles and Turbines

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