Moderate
jCorona usually occurs when the electrostatic stress in air around the conductor exceeds?
Correct answer: D. 30 kV (maximum value)/cm
- A. 6.6 kV (r.m.s. value)/cm
- B. 11 kV (r.m.s. value)/cm
- C. 22 kV (maximum value)/cm
- D. 30 kV (maximum value)/cm
Explanation
Corona begins when the electric stress at the conductor surface reaches roughly 30 kV/cm maximum value in air. The other values either use the wrong magnitude or specify an unsuitable RMS basis.
Last updated
Practise Power Systems
334 free Power Systems MCQs from Electrical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Electrical Engineering questions like this
Electrical Engineering is on 2 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.