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Thermal Engineering
Thermal Engineering Basic
Quiz 1
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Q.1
A boiler produces dry and saturated steam atbar pressure. Calculate the factor of evaporation if the feed water temperature is 45°C.
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 boiler generates steam at 12.5 bar pressure. Temperature of the feed water is 35°C. Determine the factor of evaporation if the dryness fraction of the steam is 0.85.
a) 1.32
b) 0.85
c) 1.56
d) 1.04
Q.10
Steam generated by a boiler is superheated to a temperature of 230°C. The feed water temperature is 30°C. Calculate the factor of evaporation if the pressure of the steam generated isbar. Specific heat of superheated steam is 2.kJ/kg-K
a) 1.22
b) 1.03
c) 1.52
d) 1.65
Q.11
A boiler generates dry and saturated steam atbar pressure. The evaporative capacity of the boiler iskg of steam per kg of fuel fired. The equivalent evaporation is 11.6 kg of steam per kg of fuel fired. Determine the temperature of feed water.
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
Determine the temperature of feed water of a boiler having factor of evaporation equal to 1.The enthalpy of 1 kg of steam iskJ/kg.
a) 30°C
b) 40°C
c) 35°C
d) 45°C
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