Oklahoma PMU Practice Exam

What happens when you raise the bar or spring on a coil machine?

Hits softer and decreases tension Hits harder and increases tensions Stops functioning Becomes louder but same tension

Correct Answer:

Hits harder and increases tensions

Explanation:

Raising the armature bar or increasing spring tension makes the coil machine deliver a stronger, more forceful hit. The springs store energy; when you tighten them, more energy is needed to move the armature bar, so when the circuit fires, that stored energy is released as a harder impact. The result is a deeper needle penetration and greater overall force on each stroke. It wouldn’t soften the strike, stop the machine, or just change the sound without changing impact—the main effect is a harder hit due to higher spring tension.

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