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Exam (elaborations)

Absa 4B: Canadian Fourth Class Power Engineering Verified Exam Questions And Answers - Latest Version 2026

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ABSA 4B: CANADIAN FOURTH CLASS POWER ENGINEERING VERIFIED EXAM QUESTIONS AND ANSWERS - LATEST VERSION 2026

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# Question

1 What is the primary purpose of a safety valve on a boiler?

2 What does MAWP stand for?

3 The boiler horsepower is equivalent to:

4 What is the function of a steam trap?

5 Which type of boiler has water in the tubes?
6 The Bourdon tube pressure gauge measures:

7 What is the purpose of a blowdown valve?

8 A Hartford loop is used to:

9 What is feedwater?

10 The purpose of a deaerator is to:

11 What type of boiler is the Scotch marine boiler?
12 The steam drum in a water-tube boiler serves as:

13 What is superheat?

14 Which valve is used to prevent backflow in a feedwater line?

15 The purpose of a fusible plug is to:

16 What is scale in a boiler?

17 What is carryover in a boiler?

18 The purpose of a steam separator is to:

19 What is priming in a boiler?

20 What is the purpose of mud drums in a water-tube boiler?

21 What is the latent heat of vaporization?

22 One BTU is defined as:

23 What is absolute pressure?

24 What is the freezing point of water in Kelvin?

25 What does the first law of thermodynamics state?

26 Specific heat of water is approximately:

27 What is sensible heat?

28 Boyle's Law states that at constant temperature:

29 What is standard atmospheric pressure?

,30 Charles' Law states that at constant pressure:

31 What are the three elements required for combustion?

32 The stoichiometric air-fuel ratio means:

33 What is excess air in combustion?

34 Natural gas is primarily composed of:

35 What is the calorific value of a fuel?

36 Carbon dioxide in flue gases indicates:
37 What is the purpose of a burner register?
38 Incomplete combustion produces:
39 What does the Orsat apparatus measure?

40 The flash point of a fuel oil is:

41 A centrifugal pump increases fluid energy by:

42 What is cavitation in a pump?

43 NPSH stands for:

44 A positive displacement pump delivers:

45 What is pump efficiency?

46 The purpose of a mechanical seal in a pump is to:

47 What is the function of a volute casing in a centrifugal pump?

48 A gear pump is an example of:
What happens to centrifugal pump performance at shutoff (zero
49
flow)?

50 The purpose of pump priming is to:

51 What is the purpose of a heat exchanger?

52 In a counter-flow heat exchanger:

53 What is the LMTD method used for?

54 Fouling in a heat exchanger:

55 A shell-and-tube heat exchanger consists of:


56 What is the refrigeration cycle?


57 The purpose of the expansion valve in a refrigeration system is to:

58 What happens in the evaporator of a refrigeration system?

59 COP stands for:

,60 A ton of refrigeration equals:

61 What is the function of the condenser in a refrigeration system?

62 Ohm's Law states:
63 What is the unit of electrical resistance?
64 In a three-phase system, the phases are separated by:
65 What is the purpose of a transformer?

66 Power factor is:

67 A motor nameplate shows 460V, 3-phase. This motor operates on:

68 What is the purpose of a motor starter?


69 Ground fault in electrical equipment:


70 What is a fuse designed to do?

71 WHMIS stands for:

72 The purpose of a pressure relief valve is to:


73 Lockout/tagout procedures are used to:


74 A confined space requires:

75 MSDS stands for:


76 The purpose of PPE is to:


77 An IDLH atmosphere is:

78 What is the lower explosive limit (LEL)?

79 When should a safety valve be tested?


80 What action should be taken if a gas leak is detected?


81 A fire triangle consists of:


82 A thermocouple measures:


83 What is the purpose of a pressure transmitter?

84 PID control stands for:

85 A control valve in the fail-safe open position:

, 86 What does a level gauge glass show?

87 A solenoid valve is operated by:

88 What is the purpose of an interlock system?

89 A DP transmitter measures:

90 What is a positioner on a control valve?

A RTD (Resistance Temperature Detector) measures temperature
91
by:

92 ASME stands for:

93 The National Building Code of Canada covers:

94 In Alberta, operating engineers are certified under:


95 What does 'jurisdiction' mean in boiler regulation?


96 A certificate of inspection is required for:

97 The purpose of the TSSA (Ontario) or ABSA (Alberta) is to:

98 Hard water contains excessive amounts of:

99 What is the purpose of softening boiler feedwater?

100 pH of 7 indicates:
101 What does TDS stand for in water treatment?
102 Oxygen in boiler feedwater causes:

103 What chemical is commonly used to remove oxygen from feedwater?

104 The purpose of a zeolite softener is to:

105 Alkalinity in boiler water is maintained to:

106 What is a governor on a steam engine or turbine?

107 What is the purpose of a gland seal on a steam turbine?


108 A pressure reducing valve (PRV) is used to:



109 What is the function of a pressure regulator?


110 The purpose of pipe insulation is to:

111 What is water hammer?

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