## Steam Boilers, Engines, Nozzles and Turbines A wet vapor can be completely specified by

Temperature only
Pressure only
Pressure and dryness fraction
Dryness fraction only

## Steam Boilers, Engines, Nozzles and Turbines The stage efficiency (ηS) is given by (where ηB = Blading efficiency, and ηN = Nozzle efficiency)

ηS = ηB × ηN
None of the listed here
ηS = ηN / ηB
ηS = ηB / ηN

## Steam Boilers, Engines, Nozzles and Turbines The pressure at which latent heat of vaporisation of water is zero, is

1 kg/cm²
100 kg/cm²
225.6 kg/cm²
Below atmospheric pressure

## Steam Boilers, Engines, Nozzles and Turbines The equivalent evaporation is defined as

The ratio of heat actually used in producing the steam to the heat liberated in the furnace
The evaporation of 15.653 kg of water per hour from and at 100°C
The amount of water evaporated from and at 100°C into dry and saturated steam
The amount of water evaporated or steam produced in kg per kg of fuel burnt

## Steam Boilers, Engines, Nozzles and Turbines The ultimate analysis of fuel lists

Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash
Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume
Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight
Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash

Vb = 0.5 V cosα
Vb = V² cosα
Vb = 0.5 V² cosα
Vb = V cosα