WorksheetsEquivalent Evaporation Quiz
Total questions: 10
Worksheet time: 8mins
Equivalent evaporation is defined as the amount of water evaporated from:
Water at 0°C to steam at 100°C
Water at 100°C to steam at 100°C
Water at 25°C to superheated steam
Water at 0°C to dry steam at working pressure
What is the latent heat of vaporization used in equivalent evaporation calculations?
540 kcal/kg
2257 kJ/kg
4190 kJ/kg
1000 kJ/kg
The formula to calculate equivalent evaporation (EE) per kg of fuel is:
What does the Factor of Evaporation represent?
The ratio of steam to water flow
The ratio of actual heat added to latent heat at 100°C
The total feedwater flow
The amount of superheat added
A boiler produces steam with 2750 kJ/kg enthalpy from feedwater at 200 kJ/kg. What is the equivalent evaporation?
1.2 kg/kg fuel
2.3 kg/kg fuel
1.13 kg/kg fuel
0.85 kg/kg fuel
Which of the following affects equivalent evaporation?
Steam pressure only
Feedwater temperature only
Both steam condition and feedwater temperature
Only fuel calorific value
In the formula , what does x represent?
Steam pressure
Dryness fraction
Steam quality factor
Steam generation rate
A boiler receives feedwater at 45°C. It produces dry saturated steam at 10 bar. What will happen to Factor of Evaporation if feedwater temperature increases?
Increases
Decreases
Remains constant
First increases then decreases
The unit of equivalent evaporation is:
kJ/kg
kcal/kg
kg of steam/kg of fuel
kg of fuel/kg of steam
If factor of evaporation = 1.15, it means:
Steam is produced at 115°C
Feedwater is superheated
Heat added is 15% more than at standard condition
Steam is wet
