7/29/2019 BOE Oral Question Tag

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BOE PREVIOUS INTERVIEW QUESTIONS

1) Gcv,Ncv difference

2) Boiler tripping causes

3) Boiler interlocks and protections

4) Tripping of equipment when boiler trips

5) Hydra step principle

6) Indirect firing system (description)

7) Direct firing system (description)

8) Draft control (positive , Negative)

9) Drum internals, purpose

10) Procedure of steam separation

11) Boiler type (as per firing/construction/purpose/combustion)

12) DM plant

13) Pre boiler water treatment

14) ESPs (in detail)

15) Boiler parameters (observations/operations/parameters range/significance)

16) Boiler Losses

17) Boiler efficiency calculations (Direct ,Indirect method)

18) Speed control of Various fans

19) Oxygen importance and place of measure

20) Coal analysis (proximity, ultimate)

21) Boiler tube Welding procedure

22) BFPs (types, permissives, protections)

23) Mill temp control

24) Bottom ash hopper

25) Flue gas analysis

26) Flue gas additives (Emission control)

27) Deaeration principle

28) Boiler preservation

29) Carry over, scale formation, corrosion,Erosion,priming,foaming,fouling

30) Control offeedwater ,drum water (PH,Silica,conductivity,dissolvedOxy,phosphate)

31) Tube leak identification

32) Steps to be taken after One mill trip (in direct firing)

33) Ignition Energy

34) Mill performance Index

35) Precautions to be taken during one mill maintenance

36) Circulation ratio

37) Dissolved gases in feed water

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38) Excess air

39) Air heaters (Secondary Firing)

40) Insulation wool/material composition

41) Fire hazards (operator action)

42) Feed water temp gain

43) Purging

44) Boiler mountings, accessories

45) Safety valves pressure settings

46) Turbine vacuum

47) HP/LP dosing

48) Boiler zones

49) Pressure parts

50) Economizers

51) Types of boilers (classification)

52) Combustion procedures

53) Types of furnaces

54) Sensible heat, latent heat

55) Material Composition of various boiler parts

56) Feed water temp gain in feed water path

57) Draft drop across various pressure parts

58) Flue gas temp drop in flue gas path

59) Velocity of flue gas in flue gas path

60) Ash fusion temp of boiler (design value)

61) Heat rate of boiler (design value)

62) Furnace combustion temp(design value)

63) What is Dry bottom furnace

64) Drum level control (single element,3 element)

65) Causes off furnace explosions

66) Secondary air control

67) Rankine cycle, carnot cycle