Boiler Operation Engineer Previous year Questions With Answer Set - 40
1. 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
Ans. a
2. 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
Ans. d
3. 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
Ans. c
4. Which of the following is the correct formula for factor of evaporation?
a) f = h−hf1/2257
b) f = hf1−h/2257
c) f = h−hf1/1257
d) f = hf1−h/1257
Ans. a
5. Which of the correct formula for calculating equivalent evaporation?
a) me=ma(h−hf1)/2257
b) me=ma(h−hf1)/1257
c) me=ma(hf1−h)/2257
d) me=(h−hf1)/ 2257
Ans. a
6. Boiler efficiency doesn’t depend on _____
a) calorific value of fuel fired
b) specific heat of steam generated
c) boiler design
d) operation time
Ans. d
7. In a boiler, some part of heat is lost to flue gases.
a) True
b) False
Ans. a
8. Which of the following is not a heat recovery equipment?
a) Economizer
b) Air preheater
c) Feed water heater
d) Steam separator
Ans. d
9. Boiler efficiency is the ratio of heat actually absorbed by water during generation of steam to the heat supplied in by the fuel in the same time period.
a) True
b) False
Ans. a
10. The following listed are some factors on which boiler efficiency depends. Which of the following is a variable factor?
a) Excess air fluctuations
b) Rated rate of firing
c) Boiler design
d) Heat recovery equipment
Ans. a
11. Which of the following is a fixed factor on which boiler efficiency depends?
a) Actual firing rate
b) Humidity of combustion air
c) Condition of heat absorbing surfaces
d) Properties of the fuel burnt
Ans. d
12. Which of the following is the correct formula for calculating boiler efficiency?
a) η = (h−hf1)/C
b) η = ma(h−hf1)/C
c) η = ma(hf1−H)/C
d) η = ma(h−hf1)/2257
Ans. b
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