BOE (BOILER OPERATION ENGINEER ) SHORT TYPE QUESTION ANSWER-2 FOR EXAMINATION:-

1. The material commonly used in boiler drum is
a. SA299
b.SA213 TP 347H
c.SA213 T91
d. SA 213 T11

2. Frequency of soot blowing in a boiler is dedicated by
a. Boiler load
b. Temperature of feed water
c. Temperature of outgoing flue gases
d. Excess at preheater

3. To improve wear resistance which element is used in boiler metallurgy
a. Cr
b. Ni
c. Mo
d. V

4. Caustic embrittlement is caused by
a. Low PH
b. Increase in silica
c. Presence of TDS
d. High ph

5.The chemical is used in boiler drum for chemical treatment of boiler water
a. Na2Po4
b. NH
c. NH3
d. HCL

6. Indicate a permissive which is not among the necessary permissive to light up any boiler
a. All drum vent closed
b. Minimum drum level
c. Boiler purge ccomplete
d. Atomising air/steam is avilable

7. For every 38 degree Celsius of superheat above saturation temperature the heat gain in station heat rate is approximately
a. 3%
b. 5%
c. 8%
d. 10%

8. What is the location of radiant superheater in furnace
a. After re-heater
b. In second pass
c. In first pass
d. Before economizer

9. The overall efficiency of supercritical boiler is
a. 35%
b. 39%
c. 42%
d. 25%

10. From the energy efficiency point of view which flow regulating device is the most suitable for radial flow fan
a. Variable frequency drive
b. Hydraulic coupling
c. Multi stage gearbox
d. Inlet guide vane

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FILL IN THE BLANKS CHOOSING APPROPRIATE ANSWER

1. The RPM of LIUNGSTROM air preheater is ……….
a. 2 to 3 RPM
b. 5 to 10 RPM
c. 10 to 15 RPM
2. The material used in cold end heating elements of rotary air preheater is…. low carbon steel / Corten steel
3. The safety device used in rotary air heater is…Rotor stoppage sensor/ soot blower / hydraulic coupling
4. The ceramics used to manufacturer tiles of a coal dust pipe lines contains approximately 90% Alumina/ Silica / Calcium sulphate / Refractory
5. The speed range of bowl mill is …Less the 50 RPM / 50-100 RMP
6. The positive displacement fuel oil pressure pumps should not run for prolonged periods with the relives valves open because this causes ……. Cavitation / Loss of pressure / Loss of power
7. A Bourbon tube is a device used to measured……. Flow velocity / Pressure / Both
8. The maximum temperature limit of SA 213 TP 347H for boiler operation is ….. 750 / 705 degree Celsius
9. An impurities in water requires critical attention in high pressure boiler is ……Suspended salts / Silica
10. In DM plant the degasser is used to remove …Co2/ Ammonia/ Hydrogen

INDICATE TRUE AND FALSE

1. the purposes of oil burner register is to stabilize the oil flame adjacent to the sprayer tip.(T)
2. Economizer re-circulation system is provided for increasing the output of boiler.(F)
3. Incomplete combustion can be best judge by measuring CO in flue gas.(T)
4. Ball and tube mill crusher the coal on the principal of impact.(T)
5. Reheating of system in turbine increase the work done through turbine and it’s efficiency.(T)
6. Wet steam shall be more effective for cleaning boiler wall surface using wall/ soot blower in furnace.(F)
7. Stress assisted corrosion is related to weld joint failure.(T)
8. Hydra step is a device mostly used to monitor Deaerator level(F)
9. Classifier installed in a mill is primarily used for varying mill output.(T)
10. LRSB or Wall blower are operated to increase the heat transfer in the boiler.(T)

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