test1

First Year Apprentice Practice exam

1. Which of the following is a computer peripheral device.

a) Mouse
b) Sound Card
c) Cpu
d) Hard Drive

2. What is the maximum size for a "Plug" Fuse

a) 15 Amp
b) 20 Amp
c) 30 Amp
d) 50 Amp

3. What term describes the opposition to Magnetic Flux Lines

a) Henry
b) Farad
c) Reactance
d) Reluctance

4. Within what distance must NMD cable be supported from an outlet box

a) 450mm
b) 300mm
c) 600mm

5. What is the name given to a diode used to prevent switch arching in an inductive circuit

a) Freewheeling
b) Reverse Bias
c) Forward Bias
d) None of the above

6. What is the Secondary voltage of a transformer with an input of 120 volts with 100 turns if the secondary has 1000 turns?

a) 120 volts
b) 120 volt's
c) 1200 volts
d) 12,000 volts

7. What size EMT conduit is permitted for 25 #10 guage TWU Copper

a) 1 1/2 inch
b) 1 1/4 inch
c) 2"
d) None of the above

8. What is the efficiency of a motor which draws 4.5 kilowatts from the line and delivers 5 horsepower?

a) 92 percent
b) 83 percent
c) 89 percent

9. Digital meters compared to analog meters generally have everything except:

a) Battery for display
b) Better accuracy
c) D'Arsonval meter movement

10. You have 6 #4 wires in a conduit. The conductors are RW90 xlpe copper & ambient is 60 deg c. what is your allowable current in each conductor

a) 45 amps
b) 68 amps
c) 56.95 amps

11. You have 6 #8 wires in a conduit. The conductors are RW90 xlpe copper. What is your allowable current in each conductor

a) 30 amps
b) 34 amps
c) 36 amps

12. A 2 story single family dwelling has a 240 volt 18-kW range. What will be the Demand for this Range?.

a) 8.4 kw
b) 18 kw
c) 12 kw
d) 7.2 kw

13. Can a #10 guage 3 conductor NMWU cable be used for direct burial to feed a 40 amp garden shed?

a) Yes
b) No
c) Depends

14. What is the minimum Length for a "ufer" Ground?

a) 3 meters
b) 600 mm
c) 1 meter
d) 6 meters

15. Find the voltage across the 5 ampere load after the neutral is opened. Both loads are resistive.

a) 180 volts
b) 120 volts
c) 0 volts

16. Identify the following W.H.M.I.S symbol

a) Electrical Shock
b) Bio Hazard
c) Corrosive

17. What size is required for the following box? 6 #14 wires, 4 splice Caps and a standard duplex receptacle?

a) 3x2x3 device box
b) 3x2x2 device box
c) single gang FS box

18. A voltmeter generally reads?

a) Peak To Peak Voltage
b) Average Voltage
c) RMS Voltage

19. If a Voltmeter reads 120 volts on a 60hz A/C system, what is the peak voltage?

a) 170 volts
b) 277 volts
c) 240 volts

20. A Clamp on Ammeter reads 5 amps. What will the ammeter read if the conductor is looped around it 5 times?

a) 0 amps
b) 25 amps
c) 1 amp
d)5 amps

21. Generally the maximum number of outlets on a 15 amp circuit in a residence is?

a) 16
b) 12
c) 8

22. What is the total resistance in the circuit below?

a) 30 ohms
b) 0 ohms
c) 10 ohms

23. What size must the bare grounding conductor be for a 200 amp service to a house?

a) #6 copper
b) #2 aluminum
c) #3 copper

24. What is the minimum overhead clearance for service conductors over a home driveway?

a) 3.5 meters
b) 4 meters
c) 5.5 meters

25. What is the total resistance in the following circuit?

a) 30 ohms
b) 60 ohms
c) 15 ohms

26. What will the Voltmeter read in the following wheatstone bridge circuit?

a) 0 volts
b) 7.5 volts
c) 10 volts

27. What position does the ground in a 14-30R Dryer plug receptacle piont?

a) up
b) down
c) Left or Right
d) doesn’t Matter

28. A 120 volt cable has a total line resistance of 33 ohms. The load at the end is 50 ohms. What is the line loss in watts?

a) 83.0 watts
b) 69 watts
c) 17.0 watts

29. What comes next after the title in a lab report?

a) objective
b) conclusion
c) parts list

30. What computer program would you use to browse the internet?

a) excel
b) explorer
c) works

31. You have a house with the following: 90 sq meters upstairs living area, 90 sq meters on the 1st floor, 80 sq mtr basement…what is total sq ft according to code?

a) 240 mtr sq
b) 260 mtr sq
c) 280 mtr sq

32. Where would you find the acceptable use table for cable other than flexible cords and and portable power cables?

a) Table 19
b) Table 11
c) Table D16

33. How deep does a ground rod have to be buried if encountering rock bottom?

a) 600 mm
b) 3 meters
c) 1.5 meters

34.       5 resistors in parallel give a reading of 10 ohms. What is the reading if they were in series?

a) 50 ohms
b) 180 ohms
c) 250 ohms
d) 500 ohms

35. What is the maximum height for overhead service conductors above ground?

a) 1.5 meters
b) 15 meters
c) 9 meters

36. How much voltage is dropped when 3 amps flows through 500 feet of copper wire 0.064 inches in diameter? Copper K=10.4

a) 3.81 volts
b) 4.81 volts
c) 8.31 volts

37. What is considered a high power resistor? Film, ceramic, wire wound, transistor

a) Film
b) Ceramic
c) Wire Wound
d)Transistor

38. The _____is the workplace safety authority.

a) OSHA
b) WCB
c) CEC
d) WHMIS

39. Providing WHMIS sheets is the responsibility of ?

a) The Employee
b) The employer
c) Both A & B

40. What is the voltage in the following circuit?

a) 12 volts
b) 17 volts
c) 32 volts

41. What is the total resistance in the following circuit?

a) 1.4 ohms
b) 14 ohms
c) 1.29 ohms

42. Which of the following does not refer to an inductor

a) Impedence Coil
b) Reactor
c) Potentiometer
d) Choke

43. The lagging effect between Flux Density and magnetic field density is called?

a) Hysterisis
b) Permeability
c) Reluctance
c) Magnetomotive Force

44. What is the total resistance of the following circuit?

a) 798 ohms
b) 620 ohms
c) 33 ohms

45. What is the voltage across Resistor R8 in the above question?

a) 1.1 volts
b) 2.8 volts
c) 5.3 volts

46. Determine how long it takes a capacitor to reach full charge for R = 12000 ohms and , C = 150 mF.

a) 9 seconds
b) 18 seconds
c) 22 seconds

47. "Four" 0.15 F capacitors are in parallel. The total capacitance is?

a) 0.12uf
b) 1.2uf
c) 0.6uf

48. An ohmmeter is connected across a discharged capacitor and the needle stabilizes at approximately 100 k . The capacitor is?

a) Leaky
b) Shorted
c) Good

49. A capacitor blocks ac but passes dc.

a) True
b) False

50. Voltage leads current by ???° in a capacitor.

a) 60 Degrees
b) 90 Degrees
c) 180 Degrees

51. Inductance is the property of an inductor that produces an opposition to any change in current

a) True
b) False

52. In testing a coil with an analog ohmmeter, if the meter reads infinity, the coil is?

a) Charged
b) Discharged
c) Open

53. An arrow drawn through the schematic symbol of an inductor indicates that the inductor is?

a) D.C
b) A.C
c) Adjustable

54. What is the value of the hypotenuse of a right triangle whose sides are 12 and 18?

a) 4.24
b) 21.63
c) 3.46

55. A transformer has 120 primary turns and 20 secondary turns, and Ipri is 225 Amps. What is the value of Isec?

a) 1350 amps
b) 135 amps
c) 225 amps

56. If 25 W of power are applied to the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is

a) 25 Watts
b) 250 Watts
c) 2.5 Watts

57. When a 6 V battery is connected across the primary of a transformer with 10 turns in the primary and 10 turns in the secondary, the secondary voltage is

a) 0 Volts
b) 6 Volts
c) 60 Volts

58. What kVA rating is required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV?

a) 4 Kva
b) 8 Kva
c) 16 Kva

59. A transformer changes ac to dc.

a) True
b) False

60. In a transformer, energy is transformed entirely by?

a) Magic
b) Electrical Transfer
c) Magnetic Coupling

61. Find the resistance in a 800 foot #16 guage wire? (#16 is 2538 cm) (Copper is 10.4 ohms per mil foot)

a) 300 ohms
b) 3.22 ohms
c) 322 ohms

62. What is the voltage rating of nmsc cables?

a) 150 volts or less
b) 300 volts
c) 600 volts

63. What Maximum Leakage Current Must a GFCI Breaker trip at?

a) 2 ma
b) 4 ma
c) 5 ma

64. Which is labled incorrectly?

a)                 Counter Plug
b)                                Flourescent Light
c)                   Duplex Receptacle

65. What size neutral supported cable (Triplex) would you use to feed a shed with an 85 amp demand at 120/240 volts?

a) #3 AWG NS1
b) #4 AWG NS1
c) #6 AWG NS1

66. In Flemings Left hand rule, What direction does the first finger point?

a) North
b) The direction of the magnetic flux
c) South

67. What is the time constant of a coil that has an inductance of 750 mh and a resistance of 10 ohms?

a) 35 milliseconds
b) 55 milliseconds
c) 75 milliseconds

68. Adding an impurity material to a semiconductor to change its properties to either an n-type or a p-type is called?

a) Polarizing
b) Doping
c) Sanitizing

69. A wire has a diameter of 3/16". What is the diameter in mils?

a) 187.5 mils
b) 1472 mils
c) 2387 mils

70. The forward voltage drop across a silicon diode measures about?

a) 1.414 Volts
b) .637 Volts
c)   0.7 Volts

71. To emit light, LEDs are operated in ?

a) Forward Bias
b) Reverse Bias
c)   Parallel

72. Does a plug under the soffits on a house need to be a GFCI?

a) Yes it is outside!
b) No, It is protected by the roof, therefore always dry.
c) Only if its lower than 2.5 Meters

73. On 24 volt Class 2 low energy circuits, the current must be limited to ____ Amps?

a) 4.167 amps
b) less than 10 amps
c) 31 amps

74. A Zener diode normally operates with _______Bias as a voltage regulator, to keep voltage constant. this differs from a conventional diode which is intended to operate in _______ Bias only

a) Forward.   Reverse
b) Forward.   Forward
c) Reverse. Forward

75. What is a messenger when refering to ns cables

a) The frequency of the applied power source
b) The ability to transfer and conduct data
c) The bare conductor used as both neutral and support

76. What size wire is used to connect a 3 kw hot water tank?

a) #14
b) #12
c) #10

77. The CEC classifies low voltage as?

a) 0 - 750 volts
b) 0-30 volts
c) 31-750 volts

78. What demand factor is used on a swimming pool heater?

a) 100%
b) 40%
c) 25%

79. Which of the following is not a single line drawing?

a) Block Diagram
b) Riser Diagram
c) Wiring Diagram
d) One line Diagram

80. What is the maximum current a class"C" Accredited Rep can work with?

a) 200 amps
b) 400 amps
c) 600 amps

81. Who may remove a lockout tag on a disconnect switch?

a) The person who put it there
b) Any licensed Electrical Contractor
c)   Any other worker who works in the plant
d) All of the above

82. An atom with a positive charge has______electrons than protons

a) More
b) Less
c) Same

83. How many branch circuits must be supplied for three refrigerators in a kitchen?

a) 3
b) 2
c) 1 split receptacle

84. Most electricity is produced by:

a) Magnetism
b) Chemical Reaction
c) Pressure

85. A Charge of 6.24 x 10      electrons is referred to as a ?

a) Coulomb
b) Joule
c) Ampere

86. If the voltage to a circuit increases, the current ?

a) Increases
b) Stays the same
c) Decreases

87. What color is generally used for an insulated ground wire?

a) Neutral gray
b) Green
c) Black

88. If the supply authority charges 0.7 cents per kwh, what does it cost to run a 1200 watt heater for 20 minutes?

a) 28 cents
b) 56 cents
c) $2.80

89. A parallel path of low resistance is commonly refered to as ?

a) Resonance Circuit
b) Short Circuit
c) Open Citcuit

90. What happens when you connect a DC. voltmeter with wrong polarity

a) It will read correctly
b) It will read backwards
c) It will read current

91. In a transformer, the oil is primarily used for?

a) Insulating
b) Lubrication
c) Cooling

92. Transistors are primarily used for?

a) Switching and amplifing
b) Amplifing and rectifying
c) Rectifying and switching

93. A shunt is a device that has very _______ Resistance

a) High
b) Low
c) Different

94. A material with better conductivity than copper is?

a) Aluminum
b) Silver
c) Steel

95. In the following, What will the ammeter read?

a) .625 amps
b) 6.25 amps
c) 62.5 amps

96. What does an "infinity" reading on an ohm meter indicate?

a) Open Circuit
b) Short Circuit
c) DC Circuit

97. Which of the following is an oblique drawing?

a) Top Left
b) Top Right
c) Bottom Left
d) Bottom Right

98. How is triboelectric power produced?

a) Friction
b) Pressure
c) Solar

99. At 120/240 volts, what will the Ammeter Read with the open neutral?

a) 240 amps
b) .273 amps
c) .876 amps

100. All 3 Lights are 150 Watts. How much current flows in the Neutral wire?

a) 0 Amps
b) 1.2 amps
c) 2.4 amps