Electrician Exam Practice Test: Top 100 Questions

ByAbdul Wassay Posted on09/12/202504/01/2026 Updated on04/01/2026 Certifications

Preparing for an electrician certification can be challenging. One of the most effective ways to succeed is by taking an electrician exam practice test. Practice tests help you understand the format, identify weak areas, and boost your confidence. This guide provides a comprehensive 100-question test with answers and tips to excel.

Electrician Exam Practice Test Top 100 Questions

Table of Contents

Why Take an Electrician Exam Practice Test?

An electrician exam practice test offers several advantages:

Familiarity with exam format: You’ll know what types of questions appear.
Time management: Practice tests help you complete the exam within the allotted time.
Self-assessment: Identify topics where you need improvement.
Confidence boost: Reduces anxiety on the actual exam day.

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Using practice tests regularly is one of the most reliable ways to prepare effectively.

Key Topics Covered in Electrician Exams

Before diving into the electrician exam practice test, it’s important to know the common topics:

Electrical circuits and wiring
Motors and transformers
Conduit and raceways
Grounding and bonding
Electrical code regulations
Safety standards and procedures
Troubleshooting and maintenance

By practicing questions in these areas, you ensure a well-rounded preparation.

Electrician Exam Practice Test

The following test includes 100 questions covering multiple areas of electrical knowledge. Attempt the test under timed conditions for best results.

General Electrical Knowledge

#	Question	Options
1	What is the unit of electrical resistance?	a) Ohm b) Volt c) Ampere d) Watt
2	Which device protects electrical circuits from overcurrent?	a) Fuse b) Transformer c) Capacitor d) Inductor
3	What color is the ground wire in residential wiring?	a) Black b) White c) Green d) Red
4	Voltage is measured in?	a) Ampere b) Volt c) Ohm d) Watt
5	What is the function of a transformer?	a) Convert AC to DC b) Change voltage levels c) Increase current d) Store energy

Electrician Exam Practice Test

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Circuit and Wiring

#	Question	Options
6	Series circuits have:	a) One path b) Multiple paths c) No path d) Infinite paths
7	Parallel circuits have:	a) One path b) Multiple paths c) No path d) Infinite paths
8	The main purpose of a circuit breaker is?	a) Store energy b) Disconnect power during fault c) Increase voltage d) Reduce resistance
9	Wire gauge is used to measure:	a) Voltage b) Current c) Conductor size d) Resistance
10	The voltage drop in a wire depends on?	a) Length b) Cross-sectional area c) Current d) All of the above

Electrical Codes and Safety

#	Question	Options
11	Which organization issues the National Electrical Code (NEC)?	a) OSHA b) NFPA c) IEEE d) IEC
12	Ground fault circuit interrupters (GFCIs) protect against?	a) Short circuits b) Overloads c) Electric shock d) Low voltage
13	Minimum clearance of electrical panels from floor is?	a) 2 feet b) 4 feet c) 6 feet d) 1 foot
14	Personal protective equipment (PPE) includes?	a) Gloves b) Safety glasses c) Insulated boots d) All of the above
15	Lockout/tagout procedures are used to?	a) Save energy b) Prevent accidental equipment startup c) Measure voltage d) Test circuits

Electrician Exam Practice Test

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Motors and Transformers

#	Question	Options
16	Three-phase motors are preferred because?	a) Less efficient b) More efficient c) Expensive d) Slow speed
17	The primary winding of a transformer receives?	a) Low voltage b) High voltage c) AC supply d) DC supply
18	Synchronous motors operate at?	a) Constant speed b) Variable speed c) No speed d) Any speed
19	An induction motor works on?	a) Magnetic induction b) Electrolysis c) Thermal effect d) Capacitance
20	Step-down transformers reduce?	a) Voltage b) Current c) Resistance d) Power

Troubleshooting and Maintenance

#	Question	Options
21	Multimeter is used to measure?	a) Voltage b) Current c) Resistance d) All of the above
22	If a motor fails to start, the first step is?	a) Replace winding b) Check power supply c) Lubricate bearings d) Replace rotor
23	A blown fuse indicates?	a) Low voltage b) Open circuit c) Overcurrent d) Short resistance
24	Continuity test checks for?	a) Voltage b) Current flow c) Open or closed circuit d) Frequency
25	Insulation resistance testers are also called?	a) Megger b) Voltmeter c) Ammeter d) Wattmeter

Electrician Exam Practice Test

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Wiring Diagrams and Load Calculations

#	Question	Options
26	Which diagram shows the actual physical connection of devices?	a) Schematic diagram b) Wiring diagram c) Ladder diagram d) Block diagram
27	Total load in a circuit is measured in?	a) Volts b) Amperes c) Watts d) Ohms
28	If a circuit has 120V and draws 10A, the power is?	a) 100W b) 1200W c) 1100W d) 12W
29	Single-phase load balancing ensures?	a) Safety b) Efficiency c) Reduced voltage drop d) All of the above
30	Load factor is calculated by dividing?	a) Maximum demand by connected load b) Average load by maximum demand c) Connected load by demand d) None of the above
31	A ladder diagram is mainly used for?	a) Lighting circuits b) Motor control circuits c) Power calculation d) Grounding
32	Voltage drop in a conductor should not exceed?	a) 1% b) 3% c) 5% d) 10%
33	Short-circuit current depends on?	a) Voltage b) Source impedance c) Load d) Both a and b
34	In a three-phase system, line voltage is higher than phase voltage by?	a) √2 b) √3 c) 2 d) 3
35	Demand factor is?	a) Ratio of maximum demand to total connected load b) Ratio of load to voltage c) Ratio of current to resistance d) None of the above

Motor Controls and Electrical Machines

#	Question	Options
36	A star-delta starter reduces?	a) Starting voltage b) Running voltage c) Resistance d) Current
37	Reversing a three-phase motor is done by swapping?	a) Two phases b) All phases c) Neutral d) Ground
38	A contactor is used for?	a) Circuit protection b) Switching motors c) Measuring current d) Reducing voltage
39	Overload relay protects motors from?	a) Short circuit b) Thermal overload c) Voltage fluctuation d) Low frequency
40	Single-phase induction motors are commonly used in?	a) Heavy industry b) Domestic appliances c) Substations d) Power plants
41	Synchronous motors maintain constant speed by?	a) Load b) Supply voltage c) Frequency d) Current
42	Motor nameplate provides information about?	a) Voltage and current b) Power rating c) Speed and phase d) All of the above
43	Capacitor start motors are used for?	a) High starting torque b) Constant speed c) Low power applications d) Energy saving
44	The function of a soft starter is to?	a) Reduce inrush current b) Increase voltage c) Decrease speed d) Reverse rotation
45	DC motors are mostly used where?	a) Constant speed is required b) Variable speed is required c) High torque at start d) Both b and c

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Lighting Circuits and Renewable Energy Systems

#	Question	Options
46	LED lamps are preferred over incandescent because?	a) Less efficiency b) Longer lifespan c) Higher heat d) Higher current
47	Fluorescent lights require?	a) Ballast b) Contactor c) Resistor d) Inductor
48	A lighting load of 2000W at 220V draws current of?	a) 9.1A b) 10A c) 8.5A d) 12A
49	Solar PV modules convert?	a) Heat to electricity b) Light to electricity c) Magnetic field to energy d) Chemical to electricity
50	Battery storage in renewable systems stores?	a) AC power b) DC power c) Both AC and DC d) Heat energy
51	Inverters convert?	a) AC to DC b) DC to AC c) AC to AC d) DC to DC
52	Solar charge controllers prevent?	a) Overcharge b) Overvoltage c) Short circuit d) All of the above
53	Wind turbines generate electricity by?	a) Magnetic induction b) Solar conversion c) Thermal energy d) Chemical reaction
54	Maximum power point tracking (MPPT) is used to?	a) Increase battery life b) Optimize solar output c) Reduce inverter size d) Reduce voltage drop
55	LED lighting circuits are preferred because they?	a) Consume less power b) Generate heat c) Require high voltage d) Flicker often

Grounding, Bonding, and Safety

#	Question	Options
56	The main purpose of grounding is?	a) Reduce voltage b) Safety from electric shock c) Increase current d) Increase power
57	Bonding connects?	a) Neutral to ground b) Conductive parts c) Load to supply d) None of the above
58	Earth resistance should be less than?	a) 1Ω b) 5Ω c) 10Ω d) 20Ω
59	Touch voltage is?	a) Voltage across equipment b) Voltage a person can contact c) Supply voltage d) None of the above
60	Protective earth conductor is usually colored?	a) Red b) Yellow c) Green/Yellow d) Blue
61	Residual current devices (RCDs) trip at?	a) 10mA b) 30mA c) 50mA d) 100mA
62	Step potential is dangerous during?	a) Lightning b) Ground faults c) Short circuits d) All of the above
63	Electrical PPE includes?	a) Gloves b) Safety glasses c) Insulated boots d) All of the above
64	Arc flash protection is essential for?	a) Low voltage systems b) High voltage systems c) Solar circuits d) DC motors
65	Safe working distance from live conductor depends on?	a) Voltage level b) Current c) Frequency d) Wire size

Electrician Exam Practice Test

NEC Codes and Regulations

#	Question	Options
66	NEC code is updated every?	a) 1 year b) 3 years c) 5 years d) 10 years
67	Residential branch circuits are usually rated at?	a) 10A b) 15-20A c) 30A d) 50A
68	Maximum number of outlets on a 15A circuit?	a) 8 b) 10 c) 12 d) 15
69	Conduit fill should not exceed?	a) 25% b) 40% c) 50% d) 60%
70	AFCI breakers protect against?	a) Short circuits b) Arc faults c) Overload d) Ground faults
71	Minimum depth for underground conduit?	a) 12 inches b) 18 inches c) 24 inches d) 30 inches
72	GFCI protection is required in?	a) Kitchens b) Bathrooms c) Outdoor outlets d) All of the above
73	Flexible cords are not allowed as?	a) Extension cords b) Permanent wiring c) Appliances d) Lighting
74	Maximum voltage drop recommended in branch circuits?	a) 2% b) 3% c) 5% d) 10%
75	NEC defines conductor ampacity based on?	a) Temperature rating b) Wire material c) Installation method d) All of the above

Motor Overload, Energy Efficiency, and Troubleshooting

#	Question	Options
76	Motor overload protection is required to prevent?	a) Short circuits b) Excessive heat c) Voltage drop d) Arc flash
77	Variable frequency drives (VFDs) are used to?	a) Control motor speed b) Increase voltage c) Decrease current d) Reduce wiring
78	High-efficiency motors reduce?	a) Power factor b) Energy consumption c) Voltage drop d) All of the above
79	Electrical troubleshooting starts with?	a) Replacing parts b) Checking power supply c) Measuring load d) Checking insulation
80	A motor humming but not starting indicates?	a) Open winding b) Low voltage c) Capacitor failure d) Both b and c
81	Thermal protection in motors is usually done by?	a) Fuse b) Overload relay c) Circuit breaker d) RCD
82	Power factor correction improves?	a) Efficiency b) Voltage c) Load d) Wiring size
83	Harmonics in electrical systems can cause?	a) Overheating b) Voltage distortion c) Equipment damage d) All of the above
84	Continuity tests help identify?	a) Open circuits b) Short circuits c) Resistance d) Current flow
85	Insulation resistance testing is important for?	a) Safety b) Motor longevity c) Preventing leakage d) All of the above

Electrician Exam Practice Test

Advanced NEC Applications and Renewable Systems

#	Question	Options
86	NEC requires surge protection devices in?	a) Residential panels b) Commercial panels c) Critical loads d) All of the above
87	Electrical metering accuracy is essential for?	a) Load calculation b) Energy billing c) System monitoring d) All of the above
88	Solar PV systems must have?	a) DC disconnect b) AC disconnect c) Proper grounding d) All of the above
89	Inverter output frequency is usually?	a) 50Hz b) 60Hz c) Both a and b d) 100Hz
90	NEC requires labeling of?	a) Panels b) Circuits c) Disconnects d) All of the above
91	Renewable energy systems should comply with?	a) IEEE standards b) NEC c) Local codes d) All of the above
92	Lightning protection for solar arrays includes?	a) Grounding b) Surge arrestors c) Bonding d) All of the above
93	Energy-efficient lighting must comply with?	a) NEC b) Energy star standards c) Local codes d) All of the above
94	Electrical junction boxes must have?	a) Covers b) Proper grounding c) Correct sizing d) All of the above
95	Arc flash labels must indicate?	a) Voltage b) Incident energy c) PPE required d) All of the above

General Knowledge and Final Review

#	Question	Options
96	Multimeter fuse blows while measuring current, what is the cause?	a) High current b) Incorrect range c) Short circuit d) All of the above
97	A circuit breaker trips immediately on turning on load, likely reason?	a) Overload b) Short circuit c) Faulty breaker d) All of the above
98	NEC requires receptacles within 6 feet of?	a) Doors b) Windows c) Sinks d) Outlets
99	Electrical service disconnect must be?	a) Easily accessible b) Locked c) Hidden d) None of the above
100	When testing GFCI outlets, trip button simulates?	a) Open circuit b) Fault to ground c) Overload d) High voltage

Electrician Exam Practice Test

Answer Key for Electrician Exam Practice Test

#	Answer
1	a
2	a
3	c
4	b
5	b
6	a
7	b
8	b
9	c
10	d
11	b
12	c
13	a
14	d
15	b
16	b
17	c
18	a
19	a
20	a
21	d
22	b
23	c
24	c
25	a

26	b
27	c
28	b
29	d
30	b
31	b
32	b
33	d
34	b
35	a
36	a
37	a
38	b
39	b
40	b
41	c
42	d
43	a
44	a
45	d
46	b
47	a
48	a
49	b
50	b
51	b
52	a
53	a
54	b
55	a
56	b
57	b
58	c
59	b
60	c
61	b
62	d
63	d
64	b
65	a
66	b
67	b
68	c
69	b
70	b
71	b
72	d
73	b
74	b
75	d

76	b
77	a
78	b
79	b
80	d
81	b
82	a
83	d
84	a
85	d
86	d
87	d
88	d
89	c
90	d
91	d
92	d
93	d
94	d
95	d
96	d
97	d
98	c
99	a
100	b

Answer Key for Electrician Exam Practice Test

Tips to Ace Your Electrician Exam

Take multiple electrician exam practice tests.
Focus on weak areas identified from the tests.
Revise electrical formulas and wiring standards regularly.
Use visual aids like wiring diagrams to memorize connections.
Keep up-to-date with the latest NEC codes and safety regulations.

Final Thoughts

Consistent practice using an electrician exam practice test is the key to success. By completing this 100-question test and reviewing the answers, you gain confidence and improve your chances of passing the certification exam on your first attempt. Start practicing today, and make your electrician career goals a reality.

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Abdul Wassay

Abdul Wassay is an Electrical Engineer with 15 years of experience in PLC, SCADA, automation, electrical troubleshooting, and renewable energy systems. He publishes practical, experience based engineering guides. View full author profile

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