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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The velocity of flue gases (V) through the chimney under a static draught of (H') metres is given by

V = 2g H'
V = 2g/H'
V = 2gH'
V = H'/2g

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Steam Boilers, Engines, Nozzles and Turbines
In impulse turbines, when friction is neglected, the relative velocity of steam at outlet tip of the blade is _________ the relative velocity of steam at inlet tip of the blade.

Greater than
Equal to
None of these
Less than

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

Increases
Remains constant
None of these
Decreases

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Steam Boilers, Engines, Nozzles and Turbines
The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity ‘V’ at inlet)

Vb = V² cos α
Vb = V cos α
Vb = 0.5 V cosα
Vb = 0.5 V² cosα

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

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

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Steam Boilers, Engines, Nozzles and Turbines
The latent heat of steam with increase of pressure

Remain same
Increases
Behaves unpredictably
Decreases

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