Common Occupational Skills — Industrial Electrician (442A) Practice Questions

Free Common Occupational Skills practice questions

1. 1.What is the minimum PPE for working near exposed energized 480V equipment?

   • A.Safety glasses only
   • B.Arc-rated clothing, face shield, insulated gloves rated for voltage✓
   • C.Hard hat and steel toes only
   • D.Rubber boots

   Why: Working near 480V requires arc flash PPE per CSA Z462 — arc-rated clothing, face shield, voltage-rated insulated gloves. An arc flash risk assessment determines the specific category.

2. 2.CSA Z462 requires an energized work permit when:

   • A.Always
   • B.When de-energizing creates a greater hazard or is infeasible✓
   • C.For any voltage over 120V
   • D.Only for work above 600V

   Why: Energized work permits are required when de-energizing creates a greater hazard (life support, continuous process) or is demonstrated to be infeasible. De-energizing is always the first choice.

3. 3.In an industrial setting, who can perform electrical work?

   • A.Anyone with basic training
   • B.Only licensed electricians or supervised apprentices✓
   • C.Any maintenance worker
   • D.Engineers only

   Why: Only licensed electricians (journeypersons) or registered apprentices under direct supervision may perform electrical work per provincial regulations.

4. 4.What information does a motor nameplate provide?

   • A.Only HP and voltage
   • B.HP, voltage, FLA, RPM, frame, efficiency, service factor, enclosure type, and more✓
   • C.Only the manufacturer
   • D.Only the serial number

   Why: Nameplate data is critical: HP, voltage, phases, FLA, RPM, frame size, efficiency, service factor, enclosure (TEFC, ODP), insulation class, design letter, and connection diagram.

5. 5.What does NFPA 70E (or CSA Z462 equivalent) primarily address?

   • A.Electrical installation standards
   • B.Electrical safety in the workplace — protecting workers from electrical hazards✓
   • C.Fire alarm systems
   • D.Lightning protection

   Why: CSA Z462 (Canadian equivalent of NFPA 70E) establishes requirements for electrical safety-related work practices to protect workers from shock and arc flash hazards.

6. 6.The minimum insulation resistance for a motor rated under 1000V is approximately:

   • A.1 kΩ
   • B.1 MΩ minimum, but 100 MΩ+ is healthy✓
   • C.100Ω
   • D.10 GΩ

   Why: Minimum acceptable is typically 1MΩ + 1MΩ per kV of rated voltage. For a 480V motor: minimum ~1.5MΩ. Healthy motors read 100MΩ or more. Below minimum = investigate.

7. 7.TECK cable is commonly used in industrial installations because:

   • A.It's cheapest
   • B.It provides mechanical protection, moisture resistance, and grounding via the interlocking armor✓
   • C.It's flexible like cord
   • D.It doesn't need supports

   Why: TECK cable has: copper conductors, insulation, shield, interlocking aluminum armor (mechanical protection + grounding), and PVC jacket (moisture). Ideal for industrial environments.

8. 8.What is the danger of a floating neutral in a 3-phase wye system?

   • A.No danger
   • B.Voltage imbalance causing overvoltage on lightly loaded phases (can exceed 200V on 120V circuits)✓
   • C.Reduced power only
   • D.Increased efficiency

   Why: A floating (disconnected) neutral allows the neutral point to shift, causing severe voltage imbalance. Lightly loaded phases see dangerously high voltage, destroying 120V equipment.

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