ISRO Electrical Engineering (EE) 2015 - Question 70

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The dielectric strength of air under normal condition is

  • A. 100 kV/cm
  • B. 150 kV/cm
  • C. 30 kV/cm
  • D. 50 kV/cm

Answer: C. 30 kV/cm

Explanation: Under standard temperature and pressure (STP: 20°C, 760 mmHg), the dielectric breakdown strength of dry air is approximately 30 kV/cm (peak) or 21.2 kV/cm (rms).

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