How do you adjust the air gap between the armature and frame when the relay is dropped out?

How do you adjust the air gap between the armature and frame when the relay is dropped out?

• A. The stop screw
• B. Increase the coil voltage
• C. Move the frame toward the armature
• D. Replace the armature

Answer: (A)

The key idea is that the gap between the armature and the frame when the coil is not energized is set by the stop screw. The armature returns to its resting position pushed away by the spring, and the stop screw fixes how far toward the frame the armature sits in that rest state. This establishes the dropout clearance, which must be just right so the relay releases reliably without chattering or sticking. If the gap is too small, the armature may seize or chatter as it drops out; if it’s too large, the contacts might not open cleanly or consistently. Turning the stop screw lets you precisely adjust that rest position and thus the dropout gap. Increasing coil voltage would change when the relay pulls in or drops out, not the physical gap at dropout. Moving the frame toward the armature would misalign or stress parts and isn’t how you adjust the resting clearance. Replacing the armature isn’t necessary if the issue is a mis-set gap.

The key idea is that the gap between the armature and the frame when the coil is not energized is set by the stop screw. The armature returns to its resting position pushed away by the spring, and the stop screw fixes how far toward the frame the armature sits in that rest state. This establishes the dropout clearance, which must be just right so the relay releases reliably without chattering or sticking. If the gap is too small, the armature may seize or chatter as it drops out; if it’s too large, the contacts might not open cleanly or consistently. Turning the stop screw lets you precisely adjust that rest position and thus the dropout gap.

Increasing coil voltage would change when the relay pulls in or drops out, not the physical gap at dropout. Moving the frame toward the armature would misalign or stress parts and isn’t how you adjust the resting clearance. Replacing the armature isn’t necessary if the issue is a mis-set gap.