Introduction:
An induction type energy meter is a widely used device for measuring electrical energy consumption. However, it is prone to certain defects that can affect its accuracy and performance. One of these defects is creeping, which can occur due to over friction compensation.

Explanation:
Creeping is a phenomenon in which the energy meter shows a small amount of rotation and registers energy consumption even when there is no load connected to it. This can lead to inaccurate readings and overcharging of consumers. Creeping can be caused by various factors, such as imperfect lag compensation, imperfect overload compensation, misalignment of the brake magnet, and over friction compensation.

Imperfect lag compensation:
Imperfect lag compensation refers to the inability of the energy meter to accurately compensate for the phase difference between the voltage and current waveforms, leading to errors in energy measurement. While this defect can affect the overall accuracy of the energy meter, it is not directly responsible for creeping.

Imperfect overload compensation:
Imperfect overload compensation occurs when the energy meter fails to accurately compensate for the increased load conditions, resulting in errors in energy measurement. While this defect can affect the overall accuracy of the energy meter, it is not directly responsible for creeping.

Misalignment of the brake magnet:
Misalignment of the brake magnet refers to the improper positioning of the magnet within the energy meter. This can lead to uneven braking and cause the rotor to rotate even when there is no load connected. However, misalignment of the brake magnet is not responsible for creeping in an induction type energy meter.

Over friction compensation:
Over friction compensation occurs when the energy meter compensates for excessive friction within its mechanism. This compensation is necessary to ensure the accuracy of energy measurement under normal operating conditions. However, if the compensation is set too high, it can cause the energy meter to rotate even when there is no load connected, resulting in creeping. This is why over friction compensation is responsible for creeping in an induction type energy meter.

Conclusion:
In an induction type energy meter, creeping can occur due to various defects. However, the correct answer is option 'B' - over friction compensation. When the energy meter compensates for excessive friction within its mechanism, it can cause the meter to rotate and register energy consumption even when there is no load connected. This leads to inaccurate readings and overcharging of consumers. Therefore, it is important to ensure proper calibration and adjustment of the energy meter to avoid creeping and maintain accurate energy measurement.