Electric Circuit Inspection and Maintenance

Questions and Answers

What should be the condition of the battery when inspected?

Overcharged

Partially charged

Dead

Fully charged (correct)

What should be done to the commutator if it is only slightly dirty or discolored?

Use a wire brush to scrub it

Clean it with a strip of No. 00 or No. 000 sandpaper (correct)

Replace it with a new one

Apply a lubricant to it

When should new brushes be installed?

When they are worn to three-quarters of their original length

When they are worn to one-half of their original length (correct)

When they are completely worn out

When they are worn to one-quarter of their original length

What should be checked in the wiring inspection?

All connections and wiring insulation Signup and view all the answers

What should be done to the armature shaft if it has rough bearing surfaces?

Replace it with a new one Signup and view all the answers

How should new brushes be seated when installing?

By wrapping a strip of No. 00 sandpaper around the commutator Signup and view all the answers

Study Notes

Starting Circuit Inspection

The starting circuit should be inspected regularly, with the frequency determined by the amount of service and operating conditions.
The battery and wiring should be checked during inspection.

Battery Inspection

Check the battery for a fully charged condition.
Verify the electrolyte level is proper and use approved water.
Ensure terminals are clean.

Wiring Inspection

Check all connections are clean and tight.
Verify wiring insulation is sound.

Brush Inspection

Check brushes slide freely in their holders and make full contact on the commutator.
Replace brushes when worn to one-half of their original length.

Commutator Inspection

Check the commutator for uneven wear, excessive glazing, or evidence of excessive arcing.
Clean the commutator with No. 00 or No. 000 sandpaper if slightly dirty, glazed, or discolored.
Turn the commutator in a lathe and undercut the mica if rough or worn.

Armature Shaft Inspection

Inspect the armature shaft for rough bearing surfaces.

Brush Installation

Properly seat new brushes by wrapping No. 00 sandpaper around the commutator and turning the armature slowly in the direction of normal rotation.
Clean sanding dust from the motor after sanding operations.

Description

Learn about the regular inspection and maintenance of electric circuits, including battery and wiring checks, to ensure safe and proper operation. This quiz covers the essential steps to prevent electrical hazards and failures.