The GATE Grind

GATE 2025 EE – Question 28

Electrical and Electronic Measurements · Instrument transformers, Digital voltmeters and multi-meters, Phase, Time and Frequency measurement · 1 mark · Multiple select

Instrument(s) required to synchronize an alternator to the grid is/are

  1. Voltmeter
  2. Wattmeter
  3. Synchroscope
  4. Stroboscope

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Show answer and explanation

Correct answer: (A) Voltmeter; (C) Synchroscope

Explanation

To synchronise an alternator the voltage magnitudes must match (checked with a voltmeter) and the phase sequence, frequency and phase angle must match (indicated by a synchroscope, or synchronising lamps). A wattmeter measures power and a stroboscope measures rotational speed; neither is needed.