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Steam Boilers, Engines, Nozzles and Turbines

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

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

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Steam Boilers, Engines, Nozzles and Turbines
100% efficiency of a thermal cycle cannot be achieved because of

Non availability of ideal substance
It is not possible to achieve 0°K temperature
Leakage
Frictional losses

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Steam Boilers, Engines, Nozzles and Turbines
Hard coke is used in

Cement industry
Thermal power plant
Blast furnace
Domestic use

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Steam Boilers, Engines, Nozzles and Turbines
Expanding steam to a very low pressure (high vacuum) in steam engines is

Economical
Desirable
Essential
Uneconomical

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Steam Boilers, Engines, Nozzles and Turbines
The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)

V = 44.72 K hd
V = 44.72 K hd
V = 44.72 hd K
V = 44.72 K hd

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Steam Boilers, Engines, Nozzles and Turbines
For maximum discharge through a chimney, the condition is that height of hot gas column producing the draught should be

Equal to the height of chimney
Two times the height of chimney
One-half the height of chimney
Four times the height of chimney

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MORE MCQ ON Steam Boilers, Engines, Nozzles and Turbines

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