Boiler Operation Engineer Objectives Questions And Answers Set - 27
b) water tube boiler
c) both can produce steam at same pressure for the same capacity
d) none of the mentioned
Ans. b
2. What is the purpose of using economizer in the boiler?
a) to heat feed water by utilizing heat from exhaust gases
b) to heat feed water by utilizing some heat from superheated steam
c) to superheat steam
d) none of the mentioned
Ans. a
3. How is the natural draught produced for exhaust gases?
a) by using fan
b) by using chimney
c) by using gravity
d) none of the mentioned
Ans. b
4. What is the purpose of super heater in a boiler?
a) to increase the temperature of saturated steam with increase in its pressure
b) to increase the temperature of saturated steam without increase in its pressure
c) to increase the temperature of feedwater for better efficiency
d) none of the mentioned
Ans. b
5. The natural draught in the steam generator depends upon _________
a) the air condition outside the chimney
b) the temperature of exhaust gases
c) the air condition outside the chimney & the temperature of exhaust gases
d) none of the mentioned
Ans. c
6. What is the disadvantage of natural draught?
a) it has less life
b) it has more maintenance cost of cleaning and more capital cost to build the chimney
c) the available draught decreases with increasing outside air temperature
d) all of the mentioned
Ans. c
7. Which device used to separate condensate from the steam without letting steam escape?
a) condenser
b) steam valve
c) steam trap
d) none of the mentioned
Ans. c
8. What is the pH value of water permissible for boiler?
a) 0
b) 7
c) slightly less than 7
d) slightly more than 7
Ans. d
9. The formation of scale boiler leads to _________
a) decrease in efficiency of boiler
b) increase in efficiency of boiler
c) increase in heat transfer
d) decrease in maintenance of boiler
Ans. a
10. Which of the following auxiliaries are not used in steam Generators?
a) economiser
b) burner
c) fan
d) stoker
Ans. a
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