Page 1 of 80
DELMAR'S STANDARD TEXTBOOK OF ELECTRICITY PREP 2026
QUESTIONS WITH VERIFIED ANSWERS DETAILED RATIONALES GRADED
A+
Part I: Safety Overview and Electrical Occupations
1. Which of the following is the most important general safety rule for electrical
workers?
A. Work as quickly as possible to minimize exposure time.
B. Treat all electrical circuits as energized until proven otherwise.
C. Work alone to avoid distractions.
D. Avoid wearing protective clothing to maintain mobility.
Rationale: The fundamental safety principle is to assume every circuit is live until
de-energized and verified, preventing accidental contact with hazardous voltage.
2. The severity of electric shock to the human body is primarily determined by
which of the following?
A. The color of the conductor insulation
B. The amount of current flowing through the body and the path it takes
C. The length of the extension cord
D. The brand of the multimeter used
Rationale: Current magnitude and pathway through vital organs determine shock
severity; even small currents can be lethal depending on the path.
3. Which of the following is a recommended practice when working with
electricity?
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,Page 2 of 80
A. Working with both hands to improve dexterity
B. Working with one hand when possible to reduce the risk of current crossing
the heart
C. Wearing metal jewelry for grounding
D. Skipping lockout/tagout procedures to save time
Rationale: The one-hand rule reduces the likelihood that current will pass through
the chest and heart, lowering the risk of fatal shock.
4. Which class of fire extinguisher is appropriate for electrical fires?
A. Class A
B. Class B
C. Class C
D. Class D
Rationale: Class C extinguishers use non-conductive agents (e.g., CO₂, dry
chemical) suitable for energized electrical equipment.
5. Electrical occupations require which of the following fundamental
competencies?
A. Only physical strength
B. Knowledge of electrical theory, safety codes, and practical installation skills
C. Only the ability to read blueprints
D. Only customer service skills
Rationale: Electrical work demands a combination of theoretical understanding,
code compliance, and hands-on skill.
6. Which of the following is a primary purpose of the National Electrical Code
(NEC)?
A. To set the price of electrical materials
B. To provide minimum requirements for safe electrical installations
C. To regulate the number of electricians in each state
D. To establish utility company rates
2|Page
,Page 3 of 80
Rationale: The NEC (NFPA 70) sets minimum safety standards for electrical
installations to protect people and property.
7. Lockout/tagout procedures are designed to do which of the following?
A. Increase the speed of repairs
B. Prevent accidental energization of equipment during maintenance
C. Eliminate the need for PPE
D. Allow multiple workers to repair the same circuit simultaneously
Rationale: Lockout/tagout isolates energy sources and prevents unexpected
startup, protecting workers during service.
8. Which of the following personal protective equipment items is essential when
working near energized equipment?
A. Cotton gloves only
B. Insulated gloves rated for the voltage involved
C. Sunglasses
D. Steel-toed boots only
Rationale: Insulated gloves rated for the applicable voltage provide a barrier
against electrical contact and arc flash hazards.
9. The effects of electric current on the body can include which of the following?
A. Only minor tingling
B. Muscle contractions, burns, respiratory arrest, and cardiac fibrillation
C. Improved reflexes
D. Increased resistance to future shocks
Rationale: Current can cause a range of injuries from muscle tetany and burns to
fatal cardiac and respiratory effects.
10. Which of the following is a recommended first-aid practice for electric shock
victims?
A. Touching the victim directly to pull them away
B. De-energizing the source before touching the victim, then calling for
3|Page
, Page 4 of 80
emergency help
C. Pouring water on the victim
D. Applying ice directly to burns
Rationale: Rescuers must avoid becoming secondary victims by ensuring the
source is de-energized before contact.
11. Which of the following is a common cause of electrical accidents in the
workplace?
A. Following lockout/tagout procedures
B. Complacency and taking shortcuts with safety procedures
C. Using properly rated PPE
D. Inspecting tools before use
Rationale: Familiarity and time pressure often lead to skipped safety steps, which
are major contributors to accidents.
12. An arc flash is best described as which of the following?
A. A low-voltage static discharge
B. A sudden, high-energy electrical discharge that produces intense heat, light,
and pressure
C. A type of battery charging method
D. A harmless spark from a switch
Rationale: Arc flashes result from fault currents through air and can cause severe
burns and blast injuries.
13. Which of the following is a key element of an electrical safety program?
A. Discouraging workers from reporting near misses
B. Regular training, hazard assessment, and enforcement of safe work practices
C. Eliminating all PPE requirements
D. Allowing unqualified personnel to perform energized work
Rationale: Effective safety programs combine training, hazard identification, and
consistent enforcement of procedures.
4|Page
DELMAR'S STANDARD TEXTBOOK OF ELECTRICITY PREP 2026
QUESTIONS WITH VERIFIED ANSWERS DETAILED RATIONALES GRADED
A+
Part I: Safety Overview and Electrical Occupations
1. Which of the following is the most important general safety rule for electrical
workers?
A. Work as quickly as possible to minimize exposure time.
B. Treat all electrical circuits as energized until proven otherwise.
C. Work alone to avoid distractions.
D. Avoid wearing protective clothing to maintain mobility.
Rationale: The fundamental safety principle is to assume every circuit is live until
de-energized and verified, preventing accidental contact with hazardous voltage.
2. The severity of electric shock to the human body is primarily determined by
which of the following?
A. The color of the conductor insulation
B. The amount of current flowing through the body and the path it takes
C. The length of the extension cord
D. The brand of the multimeter used
Rationale: Current magnitude and pathway through vital organs determine shock
severity; even small currents can be lethal depending on the path.
3. Which of the following is a recommended practice when working with
electricity?
1|Page
,Page 2 of 80
A. Working with both hands to improve dexterity
B. Working with one hand when possible to reduce the risk of current crossing
the heart
C. Wearing metal jewelry for grounding
D. Skipping lockout/tagout procedures to save time
Rationale: The one-hand rule reduces the likelihood that current will pass through
the chest and heart, lowering the risk of fatal shock.
4. Which class of fire extinguisher is appropriate for electrical fires?
A. Class A
B. Class B
C. Class C
D. Class D
Rationale: Class C extinguishers use non-conductive agents (e.g., CO₂, dry
chemical) suitable for energized electrical equipment.
5. Electrical occupations require which of the following fundamental
competencies?
A. Only physical strength
B. Knowledge of electrical theory, safety codes, and practical installation skills
C. Only the ability to read blueprints
D. Only customer service skills
Rationale: Electrical work demands a combination of theoretical understanding,
code compliance, and hands-on skill.
6. Which of the following is a primary purpose of the National Electrical Code
(NEC)?
A. To set the price of electrical materials
B. To provide minimum requirements for safe electrical installations
C. To regulate the number of electricians in each state
D. To establish utility company rates
2|Page
,Page 3 of 80
Rationale: The NEC (NFPA 70) sets minimum safety standards for electrical
installations to protect people and property.
7. Lockout/tagout procedures are designed to do which of the following?
A. Increase the speed of repairs
B. Prevent accidental energization of equipment during maintenance
C. Eliminate the need for PPE
D. Allow multiple workers to repair the same circuit simultaneously
Rationale: Lockout/tagout isolates energy sources and prevents unexpected
startup, protecting workers during service.
8. Which of the following personal protective equipment items is essential when
working near energized equipment?
A. Cotton gloves only
B. Insulated gloves rated for the voltage involved
C. Sunglasses
D. Steel-toed boots only
Rationale: Insulated gloves rated for the applicable voltage provide a barrier
against electrical contact and arc flash hazards.
9. The effects of electric current on the body can include which of the following?
A. Only minor tingling
B. Muscle contractions, burns, respiratory arrest, and cardiac fibrillation
C. Improved reflexes
D. Increased resistance to future shocks
Rationale: Current can cause a range of injuries from muscle tetany and burns to
fatal cardiac and respiratory effects.
10. Which of the following is a recommended first-aid practice for electric shock
victims?
A. Touching the victim directly to pull them away
B. De-energizing the source before touching the victim, then calling for
3|Page
, Page 4 of 80
emergency help
C. Pouring water on the victim
D. Applying ice directly to burns
Rationale: Rescuers must avoid becoming secondary victims by ensuring the
source is de-energized before contact.
11. Which of the following is a common cause of electrical accidents in the
workplace?
A. Following lockout/tagout procedures
B. Complacency and taking shortcuts with safety procedures
C. Using properly rated PPE
D. Inspecting tools before use
Rationale: Familiarity and time pressure often lead to skipped safety steps, which
are major contributors to accidents.
12. An arc flash is best described as which of the following?
A. A low-voltage static discharge
B. A sudden, high-energy electrical discharge that produces intense heat, light,
and pressure
C. A type of battery charging method
D. A harmless spark from a switch
Rationale: Arc flashes result from fault currents through air and can cause severe
burns and blast injuries.
13. Which of the following is a key element of an electrical safety program?
A. Discouraging workers from reporting near misses
B. Regular training, hazard assessment, and enforcement of safe work practices
C. Eliminating all PPE requirements
D. Allowing unqualified personnel to perform energized work
Rationale: Effective safety programs combine training, hazard identification, and
consistent enforcement of procedures.
4|Page
