Value of wave front & wave tail of standard lightning impulse wave

Q.  What is the value of the wave front and the wave tail of the standard lightning impulse wave used in the impulse voltage withstand test?
- Published on 24 Nov 15

a. 50 μ sec and 1.2 μ sec
b. 1.2 μ sec and 50 μ sec
c. 50 μ sec and 2.1 μ sec
d. 2.1 μ sec and 50 μ sec

ANSWER: 1.2 μ sec and 50 μ sec

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