NCCER Electrical Level 3 Certification Practice Mock Exam Latest Update Fast Reviewed From Actual Test 150 Most Examined Questions And 100% Verified Answers| A+ Grade Q&A | Instant Download Pdf

NCCER Electrical Level 3 Certification
Practice Mock Exam Latest 2025-2026
Update Fast Reviewed From Actual Test
150 Most Examined Questions And
100% Verified Answers| A+ Grade Q&A
| Instant Download Pdf
1. A 3-phase motor is drawing unbalanced current. Which instrument is most
appropriate for diagnosing the issue?
A. Voltmeter
B. Ammeter
C. Clamp-on ammeter
D. Ohmmeter
✔ Correct Answer: C (Clamp-on ammeter)
A clamp-on ammeter allows measurement of current in each phase
conductor individually without disconnecting the circuit, making it ideal for
identifying imbalance.
2. What is the primary function of a motor control center (MCC)?
A. Step up voltage
B. Distribute and control motors
C. Convert AC to DC
D. Protect lighting circuits
✔ Correct Answer: B (Distribute and control motors)
An MCC houses motor starters, control units, and protective devices to
centrally manage multiple motors.

,3. Which NEC article covers grounding and bonding requirements?
A. Article 110
B. Article 250
C. Article 300
D. Article 430
✔ Correct Answer: B (Article 250)
Article 250 specifically addresses grounding and bonding to ensure safety
and fault current paths.
4. What type of transformer is used to increase voltage?
A. Isolation transformer
B. Step-down transformer
C. Step-up transformer
D. Autotransformer
✔ Correct Answer: C (Step-up transformer)
A step-up transformer increases voltage from primary to secondary
windings.
5. A conductor with insulation rated THHN is suitable for which condition?
A. Wet only
B. Dry and damp locations
C. Underground only
D. Hazardous only
✔ Correct Answer: B (Dry and damp locations)
THHN insulation is thermoplastic, heat-resistant, and suitable for dry and
damp environments.
6. What is the purpose of a VFD (Variable Frequency Drive)?
A. Increase current
B. Control motor speed
C. Convert DC to AC only
D. Provide grounding
✔ Correct Answer: B (Control motor speed)

, VFDs adjust frequency and voltage supplied to motors to regulate speed
and torque.
7. What happens to current in a series circuit when resistance increases?
A. Increases
B. Decreases
C. Remains constant
D. Doubles
✔ Correct Answer: B (Decreases)
According to Ohm’s Law, current decreases when resistance increases if
voltage is constant.
8. Which device protects against overload conditions in motors?
A. Fuse
B. Circuit breaker
C. Overload relay
D. Contactor
✔ Correct Answer: C (Overload relay)
Overload relays protect motors from overheating due to prolonged
excessive current.
9. What is the typical voltage of a control circuit in industrial systems?
A. 480V
B. 240V
C. 120V
D. 24V
✔ Correct Answer: D (24V)
Low-voltage control circuits, often 24V, are used for safety and reliability.
10.Which component is used to open or close a circuit remotely?
A. Transformer
B. Contactor
C. Resistor
D. Capacitor

, ✔ Correct Answer: B (Contactor)
Contactors are electrically controlled switches used for remote operation.
11.What is the unit of electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
✔ Correct Answer: C (Ohm)
Resistance is measured in ohms, representing opposition to current flow.
12.In a delta connection, line voltage is equal to:
A. Phase voltage
B. Twice phase voltage
C. Half phase voltage
D. Zero
✔ Correct Answer: A (Phase voltage)
In delta systems, line voltage equals phase voltage.
13.What is the purpose of bonding?
A. Increase voltage
B. Ensure continuity
C. Reduce resistance
D. Prevent grounding
✔ Correct Answer: B (Ensure continuity)
Bonding ensures electrical continuity and safe fault current paths.
14.What is power factor?
A. Voltage ratio
B. Resistance ratio
C. Ratio of real power to apparent power
D. Current ratio
✔ Correct Answer: C (Ratio of real power to apparent power)
Power factor indicates efficiency of power usage in AC circuits.