Electrician

1. What is the unit of electrical current?

A) Volt
B) Ampere
C) Ohm
D) Watt

2. Which device is used to measure electrical current?

A) Voltmeter
B) Ammeter
C) Ohmmeter
D) Thermometer

3. What is the purpose of a fuse in an electrical circuit?

A) To increase voltage
B) To protect the circuit from overload.
C) To measure current
D) To store energy

4. What does AC stand for in electrical terms?

A) Alternating Current
B) Active Circuit
C) Absolute Charge
D) Applied Current

5. What is the unit of electrical resistance?

A) Ampere
B) Volt
C) Ohm
D) Watt

6. Which tool is used to strip insulation from wires?

A) Screwdriver
B) Pliers
 C) Wire stripper
D) Hammer

7. In electrical wiring, what color is typically used for ground wires?

A) Red
B) Green
C) Blue
D) Black

8. A circuit is considered "open" when:

A) The switch is closed

B) There is a complete path for current
C) The path is broken
D) Current is flowing freely

9. What is the symbol for resistance in a circuit diagram?

A) Ω
B) V
C) I
D) W

10. Which tool is used to tighten screws in electrical outlets?

A) Pliers
B) Wire stripper
C) Screwdriver
D) Hammer

11. What type of current is supplied to homes and businesses?

A) Alternating Current (AC)

B) Direct Current (DC)
C) Static Current
D) Pulsating Current

12. The "hot" wire in electrical systems is typically what color?

A) Black or red
B) White
 C) Green
D) Blue

13. What happens when a circuit breaker trips?

A) The circuit opens, stopping the flow of electricity

B) The circuit closes, allowing more current to flow
C) It increases the voltage
D) It decreases the resistance

14. What is the function of a circuit breaker?

A) To step down voltage

B) To store electrical energy
C) To protect a circuit from overloading
D) To increase resistance

15. A "short circuit" occurs when:

A) Two live wires touch each other

B) The ground wire is broken
C) A circuit is properly connected
D) The switch is turned off

16. What is the purpose of grounding in electrical systems?

A) To reduce voltage
B) To create a backup circuit
C) To provide a safe path for electricity to return to the ground
D) To increase current

17. Which of the following is a non-conductor (insulator)?

A) Copper
B) Aluminum
C) Plastic
D) Steel

18. What is the function of a neutral wire

A) To carry current back to the power source

B) To supply voltage to devices
 C) To ground the system
D) To measure resistance

19. Which of the following materials is commonly used for electrical wiring?

A) Steel
B) Plastic
C) Copper
D) Wood

20. What does DC stand for in electrical terms?

A) Direct Current
B) Double Circuit
C) Digital Circuit
D) Dual Current

21. A GFCI (Ground Fault Circuit Interrupter) outlet is used to:

A) Prevent overheating
B) Protect against electric shock
C) Increase current
D) Reduce voltage

22. The symbol "V" in an electrical circuit represents:

A) Current
B) Voltage
C) Power
D) Resistance

23. What is the main purpose of insulation on electrical wires?

A) To increase current flow

B) To prevent electrical shock and short circuits
C) To reduce the size of the wire
D) To increase voltage

24. What tool is used to check if an electrical outlet is live?

A) Hammer
B) Voltage tester
 C) Wire stripper
D) Pliers

25. The power rating of electrical devices is measured in:

A) Volts
B) Amperes
C) Watts
D) Ohms

26. In a standard electrical circuit, what color is the neutral wire typically?

A) Black
B) Green
C) White
D) Red

27. Which component stores electrical energy in a circuit?

A) Resistor
B) Capacitor
C) Inductor
D) Fuse

28. A three-way switch is typically used to:

A) Control one light from two locations

B) Increase the current in the circuit
C) Reduce voltage
D) Ground the circuit

29. Electrical power is calculated by multiplying:

A) Current and resistance

B) Voltage and current
C) Voltage and resistance
D) Current and capacitance

30. Which of the following is a common voltage used in residential wiring?

A) 110/120 volts
B) 440 volts
 C) 12 volts
D) 240/250 volts

31. The device that converts AC to DC is called a:

A) Transformer
B) Rectifier
C) Capacitor
D) Inductor

32. Which device is used to change the voltage level in an electrical circuit?

A) Transformer
B) Resistor
C) Capacitor
D) Diode

33. The resistance of a conductor increases when:

A) Its length decreases

B) Its cross-sectional area increases
C) Its temperature increases
D) The voltage is doubled

34. Which part of the electrical system connects all the metal parts of devices to prevent electrical
shock?

A) Neutral wire
B) Ground wire
C) Hot wire
D) Circuit breaker

35. What is the symbol for current in an electrical equation?

A) I
B) V
C) R
D) P

36. What is the role of an electrician’s multimeter?

A) To measure light intensity

B) To measure voltage, current, and resistance
 C) To connect circuits
D) To tighten wires

37. Which of the following materials is a good conductor of electricity?

A) Rubber
B) Copper
C) Wood
D) Glass

38. What does a circuit tester do?

A) Opens circuits
B) Detects electrical current
C) Strips wires
D) Increases voltage

39. What happens when a wire is overloaded with too much current?

A) The wire cools down

B) The wire may overheat and cause a fire
C) The wire’s resistance decreases
D) Nothing happens

40. What does a step-down transformer do?

A) Increases voltage
B) Decreases voltage
C) Converts AC to DC
D) Converts DC to AC

41. What is Ohm's Law?

A) V = I × R
B) P = I × V
C) R = V × P
D) V = P × I

42. A switch in the "ON" position means the circuit is:

A) Closed
B) Open
 C) Grounded
D) Shorted

43. The amount of electric energy used by a device is measured in:

A) Amps
B) Volts
C) Watts
D) Ohms

44. What is the purpose of an electrical conduit?

A) To connect two circuits

B) To protect electrical wires
C) To increase current flow
D) To decrease voltage

45. A parallel circuit has:

A) One path for current

B) Multiple paths for current
C) No path for current
D) Only resistors

46. In a typical residential outlet, how many prongs are there?

A) 2
B) 3
C) 4
D) 1

47. The process of connecting electrical devices and systems safely is known as:

A) Grounding
B) Bonding
C) Resisting
D) Charging

48. What does a diode do in a circuit?

A) Allows current to flow in only one direction

B) Increases voltage
 C) Stores electrical energy
D) Reduces resistance

49. What is the purpose of a light switch?

A) To increase voltage
B) To open or close a circuit
C) To decrease resistance
D) To convert AC to DC

50. Which of the following is a safety device used in home electrical systems?

A) Capacitor
B) Fuse
C) Diode
D) Transformer

51. Electrical wiring in a home is typically made of which material?

A) Steel
B) Copper
C) Plastic
D) Iron

52. What does a load in a circuit do?

A) Consumes electrical energy

B) Generates electricity
C) Increases voltage
D) Reduces resistance

53. Which of the following is a basic rule of electrical safety?

A) Always use the ground wire

B) Never touch live wires with bare hands
C) Always use a higher-rated fuse
D) Use plastic wiring

54. Which of the following is NOT a type of circuit?

A) Series
B) Parallel
 C) Closed
D) Resistance

55. Which of these tools is most commonly used to cut wires?

A) Screwdriver
B) Hammer
C) Wire cutters
D) Pliers

56. The primary function of a resistor in a circuit is to:

A) Store energy
B) Allow current to flow
C) Restrict the flow of current
D) Convert AC to DC

57. What is the symbol for voltage in a circuit diagram?

A) I
B) V
C) R
D) P

58. What happens if the neutral wire is disconnected in a live circuit?

A) Nothing
B) The circuit will operate normally
C) The circuit will not work properly
D) The voltage will increase

59. What is the first step in troubleshooting an electrical circuit?

A) Replace the circuit breaker

B) Check for voltage
C) Tighten all screws
D) Turn off the power

60. What is the function of an electrical panel in a home?

A) To connect devices
B) To distribute electrical power to different circuits
 C) To increase voltage
D) To decrease current

Answer Sheet

1. B - Ampere
2. B - Ammeter
3. B - To protect the circuit from overload
4. A - Alternating Current
5. C - Ohm
6. C - Wire stripper
7. B - Green
8. C - The path is broken
9. A-Ω
10. C - Screwdriver
11. A - Alternating Current (AC)
12. A - Black or red
13. A - The circuit opens, stopping the flow of electricity
14. C - To protect a circuit from overloading
15. A - Two live wires touch each other
16. C - To provide a safe path for electricity to return to the ground
17. C - Plastic
18. A - To carry current back to the power source
19. C - Copper
20. A - Direct Current
21. B - Protect against electric shock
22. B - Voltage
23. B - To prevent electrical shock and short circuits
24. B - Voltage tester
25. C - Watts
26. C - White
27. B - Capacitor
28. A - Control one light from two locations
29. B - Voltage and current
30. A - 110/120 volts
31. B - Rectifier
32. A - Transformer
33. C - Its temperature increases
34. B - Ground wire
35. A-I
36. B - To measure voltage, current, and resistance
37. B - Copper
 38. B - Detects electrical current
39. B - The wire may overheat and cause a fire
40. B - Decreases voltage
41. A-V=I×R
42. A - Closed
43. C - Watts
44. B - To protect electrical wires
45. B - Multiple paths for current
46. B-3
47. B - Bonding
48. A - Allows current to flow in only one direction
49. B - To open or close a circuit
50. B - Fuse
51. B - Copper
52. A - Consumes electrical energy
53. B - Never touch live wires with bare hands
54. D - Resistance
55. C - Wire cutters
56. C - Restrict the flow of current
57. B-V
58. C - The circuit will not work properly
59. D - Turn off the power
60. B - To distribute electrical power to different circuits

61. What is the primary function of a circuit breaker?

a) To provide electrical power
b) To protect circuits from overload or short circuits
c) To measure voltage
d) To convert AC to DC
Answer: b) To protect circuits from overload or short circuits
62. Which of the following is the most common electrical wire used in residential wiring?
a) Aluminum wire
b) Copper wire
c) Steel wire
d) Brass wire
Answer: b) Copper wire
63. What does the color red generally indicate in electrical wiring?
a) Neutral wire
b) Ground wire
c) Live or phase wire
d) Both neutral and live wire
Answer: c) Live or phase wire
64. Which of the following tools is primarily used for measuring electrical current?
a) Voltmeter
b) Ammeter
c) Ohmmeter
d) Insulation tester
Answer: b) Ammeter
65. What is the standard voltage for a residential circuit in most countries?
a) 110V
b) 120V
c) 220V
d) 240V
Answer: b) 120V
66. Which of these is a key part of the National Electrical Code (NEC)?
a) Guidelines for construction materials
b) Safety regulations for electrical systems
c) Specifications for HVAC systems
d) Rules for plumbing systems
Answer: b) Safety regulations for electrical systems
67. What is the purpose of a ground wire in an electrical circuit?
a) To provide a return path for current
b) To reduce resistance
c) To prevent electrical shock by directing fault currents safely to the ground
d) To increase voltage
Answer: c) To prevent electrical shock by directing fault currents safely to the ground
68. Which type of circuit is most commonly used in residential buildings?
a) Series circuit
b) Parallel circuit
c) Series-parallel circuit
d) Open circuit
Answer: b) Parallel circuit
69. Which of these is a sign of an overloaded circuit?
a) Lights flickering
b) Electrical shock when touching outlets
c) Circuit breakers frequently trip
d) All of the above
Answer: c) Circuit breakers frequently trip

70. What is the function of a fuse in an electrical circuit?

a) To regulate voltage
b) To prevent excessive current by breaking the circuit when overloaded
c) To measure resistance
d) To convert AC to DC
Answer: b) To prevent excessive current by breaking the circuit when overloaded
71. What type of wire is commonly used for grounding in residential electrical systems?
a) Insulated copper wire
b) Bare copper wire
c) PVC insulated wire
d) Steel wire
Answer: b) Bare copper wire
72. What does the term "short circuit" refer to?
a) An open circuit
b) A fault where electricity bypasses the load and flows through an unintended path
c) A type of circuit that is used for lighting
d) A circuit designed to handle high current loads
Answer: b) A fault where electricity bypasses the load and flows through an unintended path
73. What is the recommended method for securing electrical cables to a building structure?
a) Using staples to secure the cables loosely
b) Securing cables with cable ties directly to the surface
c) Using approved cable clips or straps at regular intervals
d) Leaving cables unsupported to allow for air circulation
Answer: c) Using approved cable clips or straps at regular intervals
74. What is the main purpose of an electrical panel?
a) To house switches
b) To house electrical meters
c) To distribute electrical power to different circuits in a building
d) To regulate voltage levels
Answer: c) To distribute electrical power to different circuits in a building
75. What is the maximum safe current for a 14 AWG copper wire in residential wiring according to the
NEC?
a) 10 Amps
b) 15 Amps
c) 20 Amps
d) 30 Amps
Answer: b) 15 Amps
76. What safety device should be installed in a wet location to prevent electrical hazards?
a) GFCI (Ground Fault Circuit Interrupter)
b) Circuit breaker
c) Fuse
d) Surge protector
Answer: a) GFCI (Ground Fault Circuit Interrupter)
77. Which of the following is the most common cause of electrical fires in homes?
a) Incorrect wiring or overloading circuits
b) Poor insulation
c) High humidity
 d) Light bulb failure
Answer: a) Incorrect wiring or overloading circuits
78. In a three-phase electrical system, how many wires are required to carry the three-phase current?
a) 1
b) 2
c) 3
d) 4
Answer: c) 3
79. Which of the following is NOT a characteristic of a properly installed electrical outlet?
a) Ground pin securely connected
b) Outlet box grounded
c) Polarity is reversed
d) Outlet securely fastened to the wall
Answer: c) Polarity is reversed
80. What is the purpose of a grounding electrode in an electrical system?
a) To connect all live wires together
b) To provide a safe path for fault currents to flow into the earth
c) To increase the voltage in the system
d) To act as a backup power source
Answer: b) To provide a safe path for fault currents to flow into the earth
81. What is the function of a junction box?
a) To store excess wire
b) To provide a safe place to connect wires and prevent short circuits
c) To house electrical switches
d) To store electrical appliances
Answer: b) To provide a safe place to connect wires and prevent short circuits
82. What is the main purpose of using conduit in electrical installations?
a) To protect electrical wiring from physical damage
b) To increase the efficiency of the circuit
c) To add aesthetic appeal
d) To reduce the cost of the installation
Answer: a) To protect electrical wiring from physical damage
83. What is the required clearance for electrical wiring near a chimney or flue?
a) 1 inch
b) 3 inches
c) 6 inches
d) 12 inches
Answer: b) 3 inches
84. What does the acronym "NEC" stand for?
a) National Electric Code
b) National Electrical Circuit
c) Non-Electrical Code
 d) National Engineering Code
Answer: a) National Electric Code
85. Which of the following is an appropriate response if you find a frayed or exposed electrical wire?
a) Tape it and leave it in place
b) Replace the damaged section or use a junction box to cover the exposed wire
c) Ignore it, as it does not pose a risk
d) Reconnect the wire and continue use
Answer: b) Replace the damaged section or use a junction box to cover the exposed wire
86. What is the purpose of an isolation transformer?
a) To increase voltage
b) To isolate electrical equipment from the power supply for safety
c) To decrease current
d) To filter electrical noise
Answer: b) To isolate electrical equipment from the power supply for safety
87. Which of the following is an advantage of using a circuit breaker over a fuse?
a) It cannot be reset once it trips
b) It can be reused after it trips
c) It provides better protection
d) It is cheaper than a fuse
Answer: b) It can be reused after it trips
88. Which type of wire insulation is commonly used in areas exposed to sunlight?
a) PVC
b) Rubber
c) THHN
d) XLPE
Answer: c) THHN
89. What type of outlet is required in kitchens, bathrooms, and outdoor areas?
a) Standard outlet
b) GFCI outlet
c) Two-prong outlet
d) Three-way outlet
Answer: b