Question

To avoid the cripping error in the energy meters, the discs must

• A. be laminated
• B. be thin
• C. have a bar magnet
• D. have holes

Hint:

Lamination of discs in energy meters helps in reducing eddy current losses and prevents cripping errors.

Answer 1

The Correct Option is A

Step 1: Understand cripping error.
Cripping error is a phenomenon in energy meters where the disc comes to rest prematurely due to hysteresis losses in the iron core, leading to inaccurate readings.
Step 2: Preventing cripping error.
To reduce this error, the discs must be laminated to minimize eddy current losses and reduce hysteresis in the magnetic field.
Step 3: Conclusion.
Thus, the discs must be laminated to avoid cripping error, corresponding to option (A).