ITI Boiler Operator Questions and Answers
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MCQ Objective Questions and Answers for Boiler Operator Jobs
1. In the fire tube boilers :
(A) The hot gases pass through tubes and water surrounds the tubes
(B) The water passes through the tubes and hot gases surround the tubes
(C) Fire surrounds the tubes and water passes in the tubes
(D) All of the above
2. Lancashire boiler is :
(A) Internally fired boiler
(B) Externally fired boiler
(C) Forced circulation boiler
(D) Water tube boiler
3. Which of the following is a fire tube boiler?
(A) Stirling boiler
(B) Babcox and Wilcox boiler
(C) Velox boiler
(D) Locomotive boiler
4. Natural circulation type boiler works on the principle of :
(A) Differential density of hot and cold water
(B) Differential density of hot and cold water at chimney
(C) Natural draught system with Chimney
(D) None
5. In locomotive boiler maximum pressure is the order of :
(A) 5 bar
(B) 10 bar
(C) 20 bar
(D) 100 bar
6. Which of the following are classified as high pressure steam boiler?
(A) Loeffler boiler
(B) Benson boiler
(C) La mont boiler
(D) All of the above
7. Stirling steam boiler has:
(A) One steam drum, two water drums
(B) Two steam drums, two water drums
(C) Three steam drums, two water drums
(D) No drums
8. Equivalent evaporation as referred to steam generators is :
(A) Quantity of steam produced per kg of fuel
(B) Quantity of steam produced from water at 100° C to dry saturated steam at 100°C
(C) Quantity of steam produced from water at ambient conditions to dry saturated steam at rated pressure of boiler
(D) None of the above
9. Which of the following boilers used LPG as fuel?
(A) Manning boiler
(B) Integral furnace boiler
(C) BENT tube boiler
(D) All of the above
10. Which of the these boilers works in the temperature range below 100°C :
(A) Integral furnace boiler
(B) Stirling boiler
(C) Waste heat boiler
(D) All of the above
11. The functions of the following fitting is to extinguish boiler furnace fire in case of water level falling below safe level :
(A) Feed check valve
(B) Blow off cock
(C) Safety valve
(D) Fusible plug
12. Which of these safety valves is used in locomotive and marine engines?
(A) Dead weight safety valve
(B) Spring loaded safety valve
(C) Lever safety valve
(D) All of the above
13. Which of these boiler fitting is used to control the supply of water to the boiler and to prevent the escaping of water from the boiler when the pump pressure is less?
(A) Feed check valve
(B) Stop valve
(C) Safety valve
(D) Blow off cock
14. The function of the following fitting in boiler is to regulate the flow of steam from one steam pipe to other :
(A) Feed check valve
(B) Safety valve
(C) Blow off cock
(D) Stop valve
15. The function of the following fitting in a boiler is to prevent the pressure exceeding the maximum limit :
(A) Feed check valve
(B) Blow off cock
(C) Safety valve
(D) Fusible plug
16. Which of this component on the boiler is used to recover the waste heat of the flue gases for heating feed water?
(A) Super heater
(B) Pre heater
(C) Economiser
(D) Fusible plug
17. Which of this component on the boiler is used to increase the temperature steam above saturation temperature?
(A) Air pre heater
(B) Super heater
(C) Economiser
(D) None
18. Function of a steam separator :
(A) To remove the entrained water particles from the steam conveyed to steam engine
(B) To increase the temperature of the steam above saturation point
(C) To increase the temperature of air before it enters the furnace
(D) All the above
19. Which of the following as referred to steam boiler are defined as mountings?
(A) Safety valve
(B) Water level indicator
(C) Economiser
(D) Stop valve
20. Which of these boiler fitting is used to inject feed water into the boiler?
(A) Injector
(B) Both of them
(C) Feed pump
(D) None of them
21. Draught produced by chimney is described as:
(A) Induced draught
(B) Forced draught
(C) Natural draught
(D) Balanced draught
22. Artificial draught is produced by :
(A) Induced fan
(B) Induced fan and forced fan
(C) Forced fan
(D) All of the above
23. For locomotive boilers the draught is produced by :
(A) Forced fan
(B) Steam jet
(C) Chimney
(D) Only motion of locomotive
24. For the same draught produced the power of induced draught fan as compared to forced draught fan is :
(A) More
(B) Same
(C) Less
(D) Not predictable
25. The artificial draught is normally designed to produce :
(A) More draught
(B) Less chimney gas temperature
(C) Less smoke
(D) All of the above
26. The location of fan for induced draught is :
(A) Near bottom of chimney
(B) At the top of the chimney
(C) Near bottom of furnace
(D) Anywhere permissible
27. For maximum discharge of hot gases through the chimney, the height of the hot gas column producing draught is :
(A) Twice the height of the chimney
(B) Half the height of the chimney
(C) Equal to the height of the chimney
(D) None of the above
28. The pressure at the furnace is minimum in case of :
(A) Forced draught system
(B) Balanced draught system
(C) Induced draught system
(D) Natural draught system
29. Chimney efficiency is approximately :
(A) 20%
(B) 30%
(C) 0.25%
(D) 90%
30. Artificial draught is produced by :
(A) Air fans
(B) Fan jet
(C) Steam jet
(D) All the above
31. Equivalent evaporation as referred to steam generator mean :
(A) Quantity of dry saturated steam generated per kg of fuel at rated pressure
(B) Quantity of steam generated per hour at rated pressure
(C) Quantity of dry saturated steam generated at 1 bar from water at 100°C
(D) Quantity of dry saturated steam generated from water at S.T.P
32. Boiler efficiency is defined as :
(A) Ratio of heat output to heat input
(B) Heat input
(C) Ratio of heat input to heat output
(D) Heat output
33. Factor of evaporation as referred to boiler
(A) Actual evaporation in kg/hr / Equivalent evaporation in kg/hr
(B) Equivalent evaporation in kg/hr / Actual evaporation in kg/hr
(C) Dryness fraction of steam produced
(D) (1-Dryness fraction) of steam produced
34. The main objectives of boiler trail is to :
(A) Determine its dryness fraction
(B) Determine its efficiency
(C) Determine its capacity
(D) Determine both efficiency and capacity
35. Evaporation ratio is defined as :
(A) Quantity of steam generation / Quantity of fuel consumption
(B) Quantity of fuel consumption / Quantity of steam generation
(C) 1 / Quantity of fuel consumption
(D) 1 / Quantity of steam generation
36. Boiler turn down is defined as
(A) Ratio between full boiler output and boiler output when operating at high fire
(B) Full boiler output
(C) Ratio between full boiler output and boiler output when operating at low fire
(D) None of the above
37. When was Indian boiler regulations created?
(A) 15th October 1931
(B) 15th September 1930
(C) 23rd February 1923
(D) None of the above
38. Which steam boiler is regulated by Indian boiler regulation?
(A) Any closed vessel exceeding 22.75 litres capacity which is used for generating steam
(B) Any closed vessel exceeding 10.75 litres capacity which is for generating steam
(C) Any closed vessel exceeding 15 litres capacity which is for generating steam
(D) None of the above
39. Define the boiler terminology MCR :
(A) Maximum concentration rating
(B) Maximum rating
(C) Maximum continuous rating
(D) None of the above
40. What is combustion space in a boiler?
(A) It is the furnace volume in cubic metres per kg of fuel
(B) It is the furnace volume in cubic metres
(C) It is the furnace volume in cubic metres per kg of fuel fired per hour
(D) It is the furnace volume in meter square per kg of fuel fired per hour
41. The transformation from solid to gas phase is called :
(A) Vapourisation
(B) Condensation
(C) Boiling
(D) Sublimation
42. Which increase in pressure the boiling point of water?
(A) Increases
(B) Decreases
(C) Do not change
(D) None of the above
43. Super heated steam is :
(A) Steam at a temperature below boiling point of water
(B) Steam at a temperature above boiling point of water
(C) Steam at boiling point of water
(D) None of the above
44. At triple point :
(A) Ice on heating becomes super heated vapour
(B) Solid, liquid and vapour co-sent
(C) Ice occupies maximum specific volume
(D) Liquid water, dry saturated steam co-sent
45. Dryness fraction is defined as :
(A) Mass of dry steam / Mass of water vapour is suspension
(B) Mass of water vapour in suspension / Mass of dry steam
(C) Mass of dry steam / Man of dry steam of mass of water vapour in suspension
(D) Mass of water vapour in suspension / Mass of water vapour in suspension + mass of dry steam
46. Saturated steam 100% dry contains :
(A) 0% latent heat
(B) 90% latent heat
(C) Sensible heat
(D) 100% latent heat
47. If a steam water content is 5%, its dryness fraction is :
(A) 95%
(B) 0%
(C) 5%
(D) None of the above
48. The energy content of steam is called :
(A) Entropy
(B) Density
(C) Specific volume
(D) Enthalpy
49. The end point of the pressure-temperature curve that designates condition under which a liquid and its vapour can co-sent?
(A) Triple point
(B) Ice point
(C) Critical point
(D) None of the above
50. Only throttling calorimeter is used for measuring :
(A) Very low dryness fraction up to 0.7
(B) Very high dryness fraction up to 0.98
(C) Dryness fraction of only low pressure steam
(D) Dryness fraction of only high pressure steam
51. Air at 20°C and 101.325 kpa is called:
(A) STP
(B) NTP
(C) ISA
(D) SATP
52. Which of these is a solid fuel?
(A) Anthroate
(B) Gasoline
(C) Paraffin
(D) Town gas
53. Calorific valve of Anthroate is approximately:
(A) 12000 KJ/kg
(B) 14000 KJ/kg
(C) 1000 KJ/kg
(D) 35600 KJ/kg
54. Calorific value of determined at constant volume :
(A) Is equal to calorific value of fuel at constant pressure
(B) Is more than the calorific value of fuel at constant pressure
(C) Is less than the calorific value of fuel at constant pressure
(D) May be more or may be less depending upon molecular contraction or expansion of the products of combustion
55. The calorific valve of hydrogen/kg when burnt at constant pressure in atmosphere of air as compared to that burnt at constant volume is :
(A) Less
(B) More
(C) Equal
(D) May be more or less
56. Bomb calorimeter is used to determine the calorific value of :
(A) Solid fuels only
(B) Liquid fuels only
(C) Both solid and liquid fuels
(D) Gaseous fuel
57. Junker’s calorimeter is used to determine the calorific value of :
(A) Gaseous fuels only
(B) Solid fuels only
(C) Liquid fuels only
(D) None of the above
58. Bomb calorimeter determines :
(A) Higher calorific value of fuels at constant pressure
(B) Lower calorific value of fuels at constant pressure
(C) Higher calorific value of fuels at constant volume
(D) Lower calorific value of fuels at constant volume
59. Ultimate analysis of fuel means determination of :
(A) Higher calorific value of fuel
(B) Lower calorific value of fuel
(C) Percentage of carbon, hydrogen, nitrogen, sulphur and phosphorus
(D) Percentage of fixed carbon, ash, volatile matter and moisture
60. The higher heating value of natural gas is:
(A) 9350 Kcal/Nm3
(B) 21300 Kcal./Nm3
(C) 3 1900 Kca]/Nm3
(D) 5000 Kcal/Nm3
61. The oxygen % by volume in air is :
(A) 21%
(B) 30%
(C) 23%
(D) 79%
62. The Nitrogen % by volume in air is:
(A) 79%
(B) 30%
(C) 21%
(D) 23%
63. The amount of air required for complete combustion of fuel is called :
(A) Excess air
(B) Free air
(C) Stoichiometric air
(D) None of the above
64. For ideal combustion process for burning 1kg of a typical fuel containing 86% carbon, 12% hydrogen and 2% sulphur, the theoretically required quantity of air :
(A) 15 kg
(B) 10 kg
(C) 12.5 kg
(D) 14.1 kg
65. Free oxygen in the products of combustion is an indication of :
(A) Stoichiometric air
(B) Minimum air
(C) Excess air
(D) None of the above
66. Orsat apparatus is used to determine :
(A) Products of all constituents of fuel combustion by weight
(B) Products of all constituents of combustion of fuel by volume
(C) Products of only dry constituents of combustion by weight
(D) Products of only dry constituents of combustion by volume
67. Which of these devices can be used to detect leaks in boilers :
(A) Ultrasonic transmitter
(B) Leak detector fluid
(C) Micromanometer
(D) None of the above
68. Volumetric analysis of sample of dry products of combustion are CO2 = 10% CO =1% O2 = 8% N2= 81%, The proportion by weight are given by :
(A) 10:1:8:81
(B) 44:28:256:2268
(C) 22:14:256:2268
(D) 22:14:128:2268
69. C + O2 —> CO2 Therefore 1kg of carbon requires how much kg of oxygen?
(A) 1.67
(B) 2.67
(C) 3.67
(D) 4.67
70. The S.I unit of length is :
(A) Millimeter
(B) Centimeter
(C) Meter
(D) Inch
71. Which of these is the unit of power?
(A) Watts
(B) Joules/sec
(C) Both (A) and (B)
(D) None of them
72. 1 Pascal is how much N / m2 ?
(A) 1 N/m2
(B) 1 bar
(C) 2N / m2
(D) None of them
73. Which of these is used to measure temperature?
(A) Micrometer
(B) Pyrometer
(C) Infrared thermometer
(D) Both (B) and (C)
74. Mechanical equivalent of heat is related to :
(A) Conservation of mass
(B) Conservation of energy
(C) Conservation of momentum
(D) None of the above
75. The localised corrosion caused by oxygen in boilers is called :
(A) Scaling
(B) Pitting
(C) Erosion
(D) None of the above
76. Which of this equipment is used for boiler water treatment?
(A) Pyrometer
(B) Micrometer
(C) Dearator
(D) None of the above
77. What is the recommended hardness of boiler feed water?
(A) Less than 5 ppm
(B) Greater than 5 ppm
(C) Greater than 1 ppm
(D) Less than 1 ppm
78. When the total amount of sludge under a boiler is high, which of these methods is employed for the removal of sludge?
(A) Coagulation
(B) Dispersion
(C) Both (A) and (B)
(D) None of them
79. Which of these treatments is used for boilers which operate at low or moderate pressures?
(A) Evaporation
(B) Dearation
(C) Membrane contractors
(D) Internal treatment
