Q.1
• a) 0.95
• b) 1.15
• c) 1.10
• d) 0.85
Q.2
##### Which of the following CANNOT be the unit of ‘evaporative capacity’?
• a) kg of steam/h
• b) kg of steam/h/m2 of heating surface
• c) kg of steam/kg of air supplied
• d) kg of steam/kg of fuel fired
Q.3
##### kg of steam is produced atbar pressure having a dryness fraction of 0.The feed water temperature in the boiler is 39°C. Determine equivalent evaporation if mass of coal consumed is 8 kg.
• a) 5.05 kg of steam/kg of fuel
• b) 7.05 kg of steam/kg of fuel
• c) 8.05 kg of steam/kg of fuel
• d) 10.25 kg of steam/kg of fuel
Q.4
##### What is the unit of equivalent evaporation?
• a) kg of steam/kg of fuel fired
• b) kg of steam/h/m2 of heating surface
• c) kg of steam/h
• d) kg of steam/kg of air supplied
Q.5
##### A boiler generateskg of steam at 11.5 bar in 1 hour with the consumption of 3 kg of coal. Feed water temperature is 40°C. Calculate equivalent evaporation if the steam is dry and saturated.
• a) 10.78 kg of steam/kg of fuel
• b) 11.58 kg of steam/kg of fuel
• c) 6.32 kg of steam/kg of fuel
• d) 5.65 kg of steam/kg of fuel
Q.6
##### A boiler produceskg of steam per kg of coal burnt at a pressure ofbar. The steam generated is superheated to a temperature of 260°C. Determine the equivalent evaporation if the mean feed water temperature is 30°C.Take specific heat of superheated steam as 2.kJ/kg.
• a) 10 kg of steam/kg of fuel
• b) 12 kg of steam/kg of fuel
• c) 15 kg of steam/kg of fuel
• d) 17 kg of steam/kg of fuel
Q.7
##### What is the latent heat of vaporization of water at 100°C and 1 atm pressure?
• a) 2546 kJ/kg
• b) 1254 kJ/kg
• c) 1564 kJ/kg
• d) 2257 kJ/kg
Q.8
##### A boiler generateskg of steam, consumingkg of coal. Determine its evaporation capacity in kg of steam per hour if coal is fed to the furnace at the rate of 4 kg per hour.
• a) 60 kg of steam/hour
• b) 40 kg of steam/hour
• c) 50 kg of steam/hour
• d) 70 kg of steam/hour
Q.9
• a) 1.32
• b) 0.85
• c) 1.56
• d) 1.04
Q.10
• a) 1.22
• b) 1.03
• c) 1.52
• d) 1.65
Q.11
• a) 30°C
• b) 26°C
• c) 38°C
• d) 40°C
Q.12
##### The equivalent evaporation of a boiler iskg of steam per kg of fuel fired. The evaporation capacity of the same boiler iskg of steam per kg of fuel fired. Determine enthalpy of 1 kg of steam if the feed water temperature is 40°C.
• a) 2750 kJ/kg
• b) 2650 kJ/kg
• c) 2250 kJ/kg
• d) 2850 kJ/kg
Q.13
• a) 30°C
• b) 40°C
• c) 35°C
• d) 45°C