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CPM - Certified Plant Mechanic Electrical Systems and Controls Flashcards

6 cards from real CPM practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 CPM - Certified Plant Mechanic Electrical Systems and Controls flashcards as text

  1. What does NEC stand for in the context of US industrial electrical work?

    Answer: National Electrical Code

    NEC stands for National Electrical Code, the standard for safe installation of electrical wiring and equipment in the US.

  2. Which wire color designates a ground conductor in standard US wiring?

    Answer: Green or bare copper

    Green or bare copper wire designates the equipment grounding conductor per NEC standards.

  3. What device protects a motor from damage caused by sustained overload currents?

    Answer: Overload relay

    An overload relay monitors motor current and trips the starter circuit when current exceeds the setpoint for a defined time.

  4. What is the primary purpose of a GFCI outlet in an industrial plant environment?

    Answer: Protect against ground fault electric shock

    A GFCI (Ground Fault Circuit Interrupter) trips within milliseconds when it detects a difference between hot and neutral current, protecting personnel from shock.

  5. What condition results when a 3-phase motor loses one of its supply phases while running?

    Answer: Single phasing occurs causing overheating

    Single phasing causes the motor to draw excessive current on the remaining phases, leading to overheating and potential winding damage.

  6. What unit is used to measure electrical resistance in a circuit?

    Answer: Ohm

    Electrical resistance is measured in ohms (Ω), as defined by Ohm's Law: V = I × R.