FAA AMT Airframe Test 2026 – 400 Free Practice Questions to Pass the Exam

A growler test is primarily used to detect the presence of a shorted armature in a generator or motor. During the test, the armature is rotated near the poles of the growler while the windings are grounded to the growler body. Any shorted coil will cause a magnetic field imbalance, resulting in a visible and audible indication of a fault. This makes option B the correct answer.

Options A, C, and D are incorrect because a growler test is not used to measure electrical resistance, check the alignment of rotors, or test the insulation of wires.