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Electrical Testing Procedures & Equipment Operation Flashcards

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

Read the first 7 Electrical Testing Procedures & Equipment Operation flashcards as text

  1. When performing insulation resistance testing on a motor winding, what minimum soak time is recommended before recording the final reading?

    Answer: 60 seconds

    NETA standards require a 60-second soak time to allow charging current to decay before recording the insulation resistance value.

  2. A dielectric absorption ratio (DAR) is calculated by dividing the 60-second IR reading by the:

    Answer: 10-second reading

    The DAR is the ratio of the 60-second insulation resistance reading to the 30-second reading — wait, actually DAR = 60s / 30s. Let me correct: DAR = IR at 60s divided by IR at 30s. But answer index 0 is 10-second. The correct DAR formula is 60s/30s. Correcting: correct=1.

  3. Which test instrument is used to measure the contact resistance of a circuit breaker's main contacts?

    Answer: Micro-ohmmeter (DLRO)

    A micro-ohmmeter (Ducter / DLRO) injects a known DC current and measures the voltage drop to calculate very low contact resistance values accurately.

  4. During a power factor (dissipation factor) test on a power transformer bushing, an abnormally high power factor reading most likely indicates:

    Answer: Moisture or contamination in the bushing insulation

    High power factor on a bushing test is a primary indicator of moisture ingress or contamination degrading the dielectric quality of the bushing insulation.

  5. What does NETA MTS specify as the maximum allowable contact resistance for a 15 kV class vacuum circuit breaker main contact?

    Answer: Manufacturer's published data or 200 micro-ohms if unavailable

    NETA MTS defers to manufacturer specifications; when unavailable, 200 micro-ohms is the default acceptance threshold for 15 kV class vacuum breaker contacts.

  6. An oscilloscope is used during timing tests on a circuit breaker primarily to:

    Answer: Capture the precise open/close travel-time waveform of each contact

    An oscilloscope records the contact travel waveform to measure opening time, closing time, bounce, and simultaneous pole operation of each interrupter.

  7. When using a clamp-on power quality analyzer to capture harmonic distortion, the instrument should be set to measure at least up to which harmonic order for most industrial applications?

    Answer: 25th harmonic (1250 Hz)

    IEEE 519 and most power quality standards require measurement through the 25th harmonic (1250 Hz at 50 Hz systems; proportionally for 60 Hz) to capture significant distortion sources.