Question 344Electricity & Electronics - QMED

The correct answer is C) megger is operating normally. When a hand-cranked megger is disconnected, the pointer may not immediately return to zero, which is a normal behavior. This indicates that the megger is operating as intended and accurately measuring the insulation resistance. The pointer's failure to return to zero is due to the inherent capacitance in the insulation being tested, which causes a temporary storage of the test voltage, preventing the pointer from immediately returning to zero. The other options are incorrect because they do not accurately describe the behavior of a properly functioning megger. A stuck pointer (option D) would indicate a mechanical issue with the instrument, while options A and B would suggest that the megger is malfunctioning or out of calibration, which is not the case when the pointer fails to return to zero upon disconnection.