Question

Creeping is avoided by __________

(a) reversing the polarity of the voltage

(b) drilling two diametrically opposite holes

(c) holding the disc

(d) increasing the friction

I have been asked this question by my school principal while I was bunking the class.

Enquiry is from Errors in Single Phase Energy Meters in division Measurement of Power and Related Parameters of Electrical Measurements

Answer 1

Right answer is (b) drilling two diametrically opposite holes

Easiest explanation: In an energy meter, creeping causes the disc to rotate even when there is no current flowing. By drilling two diametrically opposite holes under the edge of the poles of a shunt magnet, rotation of the disc is limited to a minimum value.