| Directions : (1-35) For Assertion and Reason Type Questions |
| In this type of question, a statement of assertion [A] is followed by a statement of reason [R]. Mark the correct choice as : |
| Assertion: Average value of A.C. over a complete cycle is always zero. |
| Reason: Average value of A.C. is always defined over half cycle. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: B
Solution :
The mean average value of alternating current (or e.m.f.) during a half cycle is given by). \[{{I}_{m}}=\,\,0\,.\,636\,{{I}_{0}}\](or\[{{E}_{m}}=\,0\,.\,636\,{{E}_{0}}\]) During the next half cycle, the mean value of A.C. will be equal in magnitude but opposite in direction. For this reason the average of A.C. over a complete cycle is alwas zero. So the average value is always defined over a half cycle of A.C.
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