Boiler Operation Engineer Previous year Questions With Answer Set - 41
1. Assuming same efficiency for the same draught and neglecting leakage, power required by induced draught fan is greater than power required by forced draught fan.
a) True
b) False
Ans. a
2. Which of the following is FALSE about steam jet draught?
a) Low grade fuel can also be used
b) Requires low maintenance
c) Steam jet draught is a type of artificial draught
d) In case of forced steam jet draught, the jet is directed into smoke box
Ans. d
3. Which of the following statements is FALSE regarding artificial draught?
a) There is no need of water cooled bearing in forced draught fan
b) Fan size and power required by a forced draught fan are 1/5 to ½ of that required for an induced draught fan
c) Tendency for air leak into the boiler furnace is less in Induced draught fan as compared to forced draught fan
d) In forced draught the fan/blower is installed near the base of the boiler
Ans. c
4. Which of the following statement is TRUE about balanced draught?
a) No fan/blower is installed
b) A fan/blower is installed in the middle of the chimney
c) One fan/blower is installed at the base of the boiler and one near the base of the chimney
d) Two fans/blowers are installed both at the base of the boiler
Ans. c
5. Where is fan/blower located in case of forced draught?
a) Near the base of chimney
b) At the top of the chimney
c) At the grate
d) At the base of the boiler
Ans. d
6. In case of Induced draught, where is the fan/blower installed?
a) Near the base of chimney
b) At the top of the chimney
c) At the grate
d) At the base of the boiler
Ans. a
7. Mechanical draught is used in locomotives and small installations.
a) True
b) False
Ans. b
6. What is the ratio of draught in terms of column of hot gases to the chimney height when the discharge though chimney is maximum?
a) 2.0
b) 1.5
c) 1.0
d) 0.5
Ans. c
7. The draught produced by the chimney is due to the difference in densities between the column of hot gases inside the chimney and the cold air present outside.
a) True
b) False
Ans. a
8. The frictional resistance offered to the flow of flue gases by the grate and gas passages result in draught losses.
a) True
b) False
Ans. a
9. What is draught?
a) The condition of a dry boiler is called draught
b) It’s a small pressure difference which causes the flow of gases
c) It is a boiler mounting
d) It is a boiler accessory
Ans. b
10. Draught is classified into _____
a) Artificial and natural draught
b) Induced and forced draught
c) Steam jet and mechanical draught
d) Chimney draught and boiler draught
Ans. a
11. Natural draught is obtained using _____
a) Economizer
b) Induced fan
c) Chimney
d) Induced and forced fan
Ans. c
12. Artificial draught is classified into steam jet and mechanical draught.
a) True
b) False
Ans. a
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