## Steam Boilers, Engines, Nozzles and Turbines At critical point, i.e. p=225.65 kg/cm², the latent enthalpy of vaporisation is

Depends on temperature also
Maximum
Zero
Minimum

421 kg.m
102 kg.m
421 kg.m
539 kg.m

## Steam Boilers, Engines, Nozzles and Turbines For a Parson's reaction turbine, if α₁ and α₂ are fixed blade angles at inlet and exit respectively and β₁ and β₂ are the moving blade angles at entrance and exit respectively, then

α₁ = β₁ and α₂= β₂
α₁ = α₂ and β₁ = β₂
α₁ < β₁ and α₂ > β₂
α₁ = β₂ and β₁ = α₂

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

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

## Steam Boilers, Engines, Nozzles and Turbines When the circulation of water, in a boiler, is by a centrifugal pump, then the boiler is known as

Externally fired boiler
Natural circulation boiler
Internally fired boiler
Forced circulation boiler

## Steam Boilers, Engines, Nozzles and Turbines The difference of supersaturated temperature and saturation temperature at that pressure is called

Degree of superheat
Degree of under-cooling
None of the listed here
Degree of super-saturation