F - Electrical Wiring, Lighting Circuits and Circuit Protection

Question 1

Which of the following is Not a method of protecting a conductor from corrosion: heat shrinking tubing, liquid tape, flux, or electrical tape?

Answer 1

Flux

Question 2

There is a discussion between two technicians about wiring harness and terminal repairs. Technician A thinks that rosin paste and rosin core solder would work best for electrical repairs. Technician B thinks that when a conductor needs to be replaced, it should never be replaced with a smaller gauge wire. Who is right?

Answer 2

Both Tech A and Tech B

Question 3

All wiring harness connectors have:

Answer 3

Locking mechanisms, mating guides, and removable pins and sockets.

Question 4

The purpose of a (?) is to pass electrical from one set of wires to another.

Answer 4

Conductor connector.

Question 5

(?) must carry the large current flows required to start a high compression diesel engine.

Answer 5

Cranking circuits.

Question 6

(?) on heavy equipment is used to transfer visual, audio, or digital information.

Answer 6

Communication wiring.

Question 7

To open a wiring harness that is taped, a (?) can be used without damaging the conductor.

Answer 7

Seam ripper.

Question 8

Always install hold-down brackets, clamps and wire ties to prevent wiring harness vibration or movement that could cause:

Answer 8

Chafing.

Question 9

If conductor wires are not damaged, but the conductor insulation is damaged, it can be repaired using:

Answer 9

Heat shrink tubing.

Question 10

An approved method of repairing copper conductors is:

Answer 10

Crimp splicing.

Question 11

All electrical schematics are drawn in a (?) condition.

Answer 11

De-energized.

Question 12

The components of an electrical switch that conducts the electrical current are called:

Answer 12

Contacts.

Question 13

In a trailer clearance light circuit, the non-cycling circuit breaker keeps overheating and has to be manually reset. Tech A says that installing a cycling circuit breaker with higher amperage than specification will correct the problem. Tech B says installing a higher amperage cycling circuit breaker may cause damage to the wiring harness and components. Who is right.

Answer 13

Your girlfriend. Your girlfriend is always right.

Technician B

Question 14

A new set of conductors must be connected to screw-secured trailer plug terminals. Tech A says that the conductor wire ends must be tinned with solder before they are inserted. Tech B says that before the plug is put into service, the conductor wires and screw-secured-connectors should be covered with dielectric grease to prevent corrosion. Who is right?

Answer 14

Both Tech A and Tech B

Question 15

When a fuse in an electrical lighting circuit overheats and burns out quickly, the probable cause is:

Answer 15

Too much twerking.

A ground fault.

Question 16

When two or more electrical lighting circuits operate abnormally at the same time, the probable cause is:

Answer 16

Aliens.

A short.

Question 17

When one lamp in an electrical lighting circuit burns dimly when compared to the other lamps in the same circuit the probable cause is:

Answer 17

An unwanted high resistance.

Question 18

When current stops flowing in part of an electrical lighting circuit, the probable cause is:

Answer 18

An open circuit.

Question 19

When testing a relay a cross the coil you receive a reading of OL what is that most likely cause of failure?

Answer 19

An open circuit.

Question 20

What are the four factors a technician must consider when repairing broken conductors or replacing damaged conductors?

Answer 20

Mechanical Strength - Connection must be physically strong.
Electrical Integrity - Conductor repair must allow required current flow.
Insulation - The repair must insulate the conductor to prevent corrosion or short circuits.
Security - The repair must be secure to prevent chaffing and vibration damage.