Discussion
What is the arrangement done in alternating current relay to reduce noisy chatter?
Answer: A
The alternating flux in an AC electromagnetic relay falls to zero twice in each cycle, so the pull on the armature varies and the contacts chatter. To reduce this noisy chatter, a shading coil, a short-circuited copper ring, is placed near the tip of the pole face; it gives a second flux out of phase with the main flux so that the pull never falls to zero. A restraining spring, holes in the disc and a brake magnet do not remove chatter from an AC relay. The answer is option (A).
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