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

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Steam Boilers, Engines, Nozzles and Turbines
The expansion of steam in a nozzle follows

Stirling cycle
Joule cycle
Rankine cycle
Carnot cycle

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Steam Boilers, Engines, Nozzles and Turbines
The velocity of steam at throat of the nozzle is __________ the velocity of sound.

Equal to
Less than
More than
None of these

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the volume at cut-off to the swept volume is called

Expansion ratio
Cut-off ratio
Clearance ratio
None of these

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Steam Boilers, Engines, Nozzles and Turbines
Thermal efficiency of well maintained boiler will be of the order

0.9
0.4
0.5
0.75

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Steam Boilers, Engines, Nozzles and Turbines
Sublimation region is the region where

Solid, liquid and vapor phases are in equilibrium
Liquid and vapor phases are in equilibrium
Solid and liquid phases are in equilibrium
Solid and vapor phases are in equilibrium

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