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BOE (BOILER OPERATION ENGINEER ) SHORT TYPE QUESTION ANSWER-4 FOR EXAMINATION
BOILER MULTIPLE TYPE QUESTION AND ANSWER
1
BOE (BOILER OPERATION ENGINEER ) SHORT TYPE QUESTION ANSWER-4 FOR EXAMINATION:-
1. Sorbent is used in FBC boilers to
a. Improve combustion
b. Remove sulphur
c. Maintain furnace temperature
d. All of the above
2. In an utility boiler, Pulverized fuel is dried by
a. Secondary air
b. Primary air
c. Flue gas
d. Any of the above
3. What is the stack emission norms for power plants in chhattisgarh state
a. Less than 50 mg/Nm3
b. Less than 150 mg/Nm3
c. Less than 400 mg/Nm3
d. No limit
4. While firing HFO guns at what temperature is the HFO header maintain
a. Less than 75 degree Celsius
b. Greater than 150 deg. C
c. Around 100 deg. C
d. Can be any temperature
5. The bed height in BFB combustor is
a. 2to 6ft.
b. 6 to 10 ft.
c. Less than one feet
d. None of the above
6. YGP index of coal indicate
a. Hardness
b. Abrasiveness
c. Moisture content
d. None of the above
7. Which of the following material can with stand higher temperature
a. SA 209 T1
b. SA 213 T22
c. SA 213 T11
d. SA210 Gr C
8. Air/fuel ratio maintained in typical Bowl mill is
a. Around 2
b. Less than 1
c. Greater than 3
d. Any of the above
9. What is typical ratio of bottom to fly ash in a tangential pulverized fuel fired boiler ?
a. 20:80
b. 30: 70
c. 40 :60
d. 50: 50
10. Air motors are provided as emergency drives for
a. P.A fans
b. Air preheater
c. Ignitor fans
d. Scanner fans
BOE (BOILER OPERATION ENGINEER ) SHORT TYPE QUESTION ANSWER-4 FOR EXAMINATION:-
11. Venturi in the primary air ducting is used for measurement of
a. Flow
b. Pressure
c. Temperature
d. All of the above
12. The increase in residence time of partical in the ESP will have the following effects on the efficiency of the ESP.
a. Increase
b. Remains the same
c. Decrease
d. First increase and then decrease
13. Seal air fans provided air for the purposes of sealing
a. Gear boxes of Bowls mills
b. Bearing houses of P.A fan assy
c. Prevent leakage in APH
d. All of the above
14. Economizer is used to heat
a. Air
b. Flue gases
c. Feed Water
d. Can be any of the above
15. Natural draught in a system power plant is produced by
a. Chimney
b. Fans
c. Ducting
d. Steam jets
16. Modern utility boilers are
a. Fire tube boilers
b. Water tube boilers
c. Depending upon pressure can be either water tube or fire tube
d. None of the above
17. High CO in the flue gas is an indication of
a. Incomplete combustion in the boiler
b. High air ingress in to the boiler
c. Low moisture content in the fuel fired
d. All of the above
18. Cyclone separators are effective in removing
a. Coarser particals
b. Fine particals
c. Particals of any size
d. None of the above.
19. During normal operation, induced draft fans operated at
a. Ambient temperature
b. Flue gas temperature
c. 250 deg. C
d. Any of the above
20. DPT ( Dye penetration Test ) is used to defect
a. Surface crack
b. Sub surface cracks
c. Large voids within the structure
d. Any of the above
STATE TRUE AND FALSE
1. Secondary Air Preheater have more seal leakage than a Primary Air Preheater in typical 500Mw boiler.(F)
2. Slagging occurs only in the first pass of Pluverized fuel boile . (T)
3. Recycle ratio is more in CFB than BFB combustor.(T)
4. The height of the chimney is same irrespective the size of the unit.(F)
5. Non Metallica expansion joints take more miss- alignment than metallic expansion joints in the ducting.(T)
6. The travel of wall de-slaggers is smae as that ofLRBS’s.(F)
7. ERV’s { Electronic relief valves ) automatically release transient pressure surges in the steam limes.(T)
8. Scavenging is the term associated with oil guns.(T)
9. Combustion in FBC units takes place at temperature below the ASB fusion temperature for most fuels.(T)
10. While carrying out high pressure joint, the baking of electrode is not recommend.(F)
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