Louisiana Industrial Electrical Technician Exam
Questions And Correct Answer with Rational
(100% verified answer) Q & A 2026 /
Instant download PDF
1. What is the primary function of a transformer in an electrical system?
A. Store electrical energy
B. Convert AC to DC
C. Change voltage levels
D. Increase resistance
Answer: C. Change voltage levels
Rationale: A transformer transfers electrical energy between circuits and changes
voltage levels through electromagnetic induction.
2. Which instrument is used to measure electrical current?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Wattmeter
Answer: B. Ammeter
Rationale: An ammeter is connected in series and measures current flow in
amperes.
3. According to Ohm's Law, current equals:
,A. Voltage × Resistance
B. Voltage ÷ Resistance
C. Resistance ÷ Voltage
D. Voltage + Resistance
Answer: B. Voltage ÷ Resistance
Rationale: Ohm's Law states I = V/R.
4. What is the standard frequency of power supplied in the United States?
A. 25 Hz
B. 50 Hz
C. 60 Hz
D. 100 Hz
Answer: C. 60 Hz
Rationale: Most industrial and residential electrical systems in the U.S. operate at
60 Hz.
5. Which color is commonly used for equipment grounding conductors?
A. Red
B. Black
C. White
D. Green
Answer: D. Green
Rationale: NEC standards identify grounding conductors using green insulation or
bare copper.
6. What is the purpose of a circuit breaker?
,A. Increase voltage
B. Reduce resistance
C. Protect against overcurrent
D. Improve power factor
Answer: C. Protect against overcurrent
Rationale: Circuit breakers automatically interrupt current during overloads and
short circuits.
7. A conductor with lower resistance will generally:
A. Carry more current
B. Carry less current
C. Produce less voltage
D. Stop current flow
Answer: A. Carry more current
Rationale: Lower resistance allows greater current flow when voltage remains
constant.
8. What type of motor is most commonly used in industrial facilities?
A. Universal motor
B. Stepper motor
C. AC induction motor
D. Servo motor
Answer: C. AC induction motor
Rationale: AC induction motors are durable, efficient, and widely used in industry.
9. What is electrical power measured in?
, A. Volts
B. Ohms
C. Watts
D. Amperes
Answer: C. Watts
Rationale: Electrical power is measured in watts according to P = V × I.
10. Which device converts AC power to DC power?
A. Capacitor
B. Transformer
C. Rectifier
D. Reactor
Answer: C. Rectifier
Rationale: Rectifiers use diodes to convert alternating current into direct current.
11. What does NEC stand for?
A. National Electrical Code
B. National Energy Council
C. North Electric Code
D. National Engineering Commission
Answer: A. National Electrical Code
Rationale: The NEC provides standards for safe electrical installations.
12. What is the unit of electrical resistance?
A. Volt
B. Ohm
Questions And Correct Answer with Rational
(100% verified answer) Q & A 2026 /
Instant download PDF
1. What is the primary function of a transformer in an electrical system?
A. Store electrical energy
B. Convert AC to DC
C. Change voltage levels
D. Increase resistance
Answer: C. Change voltage levels
Rationale: A transformer transfers electrical energy between circuits and changes
voltage levels through electromagnetic induction.
2. Which instrument is used to measure electrical current?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Wattmeter
Answer: B. Ammeter
Rationale: An ammeter is connected in series and measures current flow in
amperes.
3. According to Ohm's Law, current equals:
,A. Voltage × Resistance
B. Voltage ÷ Resistance
C. Resistance ÷ Voltage
D. Voltage + Resistance
Answer: B. Voltage ÷ Resistance
Rationale: Ohm's Law states I = V/R.
4. What is the standard frequency of power supplied in the United States?
A. 25 Hz
B. 50 Hz
C. 60 Hz
D. 100 Hz
Answer: C. 60 Hz
Rationale: Most industrial and residential electrical systems in the U.S. operate at
60 Hz.
5. Which color is commonly used for equipment grounding conductors?
A. Red
B. Black
C. White
D. Green
Answer: D. Green
Rationale: NEC standards identify grounding conductors using green insulation or
bare copper.
6. What is the purpose of a circuit breaker?
,A. Increase voltage
B. Reduce resistance
C. Protect against overcurrent
D. Improve power factor
Answer: C. Protect against overcurrent
Rationale: Circuit breakers automatically interrupt current during overloads and
short circuits.
7. A conductor with lower resistance will generally:
A. Carry more current
B. Carry less current
C. Produce less voltage
D. Stop current flow
Answer: A. Carry more current
Rationale: Lower resistance allows greater current flow when voltage remains
constant.
8. What type of motor is most commonly used in industrial facilities?
A. Universal motor
B. Stepper motor
C. AC induction motor
D. Servo motor
Answer: C. AC induction motor
Rationale: AC induction motors are durable, efficient, and widely used in industry.
9. What is electrical power measured in?
, A. Volts
B. Ohms
C. Watts
D. Amperes
Answer: C. Watts
Rationale: Electrical power is measured in watts according to P = V × I.
10. Which device converts AC power to DC power?
A. Capacitor
B. Transformer
C. Rectifier
D. Reactor
Answer: C. Rectifier
Rationale: Rectifiers use diodes to convert alternating current into direct current.
11. What does NEC stand for?
A. National Electrical Code
B. National Energy Council
C. North Electric Code
D. National Engineering Commission
Answer: A. National Electrical Code
Rationale: The NEC provides standards for safe electrical installations.
12. What is the unit of electrical resistance?
A. Volt
B. Ohm
