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 shrink 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

They are both correct because they studied hard and know their shit.

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 current 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 by using … ?

Answer 9

Heat shrink tubing.

Question 10

An approved method of repairing copper conductors is … ?

Answer 10

Crimp slicing.

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. Technician A says that installing a cycling circuit breaker with higher amperage than specification will correct the problem. Technician B says installing a higher amperage cycling circuit breaker may cause damage to the wiring harness and components. Who is right?

Answer 13

Okay, I’m not even learning about any of this, I’m just the person who is typing and I already knew that the answer was Technician B.

Question 14

A new set of conductors must be connected to screw-secured trailer plug terminals. Technician A says that the conductor wire ends must be tinned with solder before they are inserted. Technician 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 Technician A and Technician B.

Question 15

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

Answer 15

A ground fault.

Question 16

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

Answer 16

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 the 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.