ISRO Electrical Engineering (EE) 2013 - Question 42

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The dielectric strength of air at a barometric pressure of 76cm and 25 degree centigrade is

  • A. 30kv/ metre.
  • B. 21.1kv rms / cm.
  • C. 21.1kv rms / mm.
  • D. 110kv / metre.

Answer: B. 21.1kv rms / cm.

Explanation: Breakdown strength of air at NTP is 30 kV/cm peak = 21.1 kV/cm rms.

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