Truck Electrical Circuit Service 190404b

Question 1

1. All electrical schematics are drawn in a de-energized condition and all the electrical
   components are drawn in their:
   a) closed position.
   b) open position.
   c) normal position.
   d) non-normal position.

Answer 1

c) normal position.

Question 2

2. List the five (5) components every truck electrical circuit must contain to be safe and
   functional.
   a)
   b)
   c)
   d)
   e)

Answer 2

a) voltage source
b) electrical conductors
c) control device
d) overcurrent protection device
e) load

Question 3

3. Ohm’s Law is used in calculating values in electrical circuits.E is the symbol for
   Electromotive force measured in volts (V), I is the symbol for Intensity of current
   flow, measured in amperes (A) and R is the symbol for Resistance to current flow,
   measured in ohms (0) What is the correct mathematical expression for Ohm’s Law?
   a) E =Ix R
   b) I=E/R
   c) R = E/I
   d) all of the above

Answer 3

D) All of the above

Question 4

4. When you are troubleshooting a malfunctioning truck lighting circuit, you use a
   process of eliminating circuit components that are not causing a problem in order to
   find the circuit component that is causing the problem. This process is called:
   a) calculating the electrical failure.
   b) picking the electrical failure.
   c) illuminating the electrical failure.
   d) isolating the electrical failure.

Answer 4

d) isolating the electrical failure.

Question 5

5. High electrical resistances in electrical circuits will cause voltage drops. Voltage
   drops that occur in truck lighting systems will cause light bulbs to:
   a) illuminate normally.
   b) illuminate dimly.
   c) illuminate brighter than normal.
   d) burn out

Answer 5

b) illuminate dimly.

Question 6

6. Manufacturers develop and publish ____ _____ to guide you through
   troubleshooting procedures.

Answer 6

Flow Charts

Question 7

7. The electrical resistance values of all the components in the _______ _
   electrical circuit add together to form the total resistance value of the circuit.

Answer 7

series

Question 8

8. The current draw across each leg of a ________ electrical circuit add
   together to form the total current draw for the entire circuit.

Answer 8

parallel

Question 9

9. An information —– —— allows the unit’s electronic control
   modules to communicate with each other.

Answer 9

data bus

Question 10

10. The best way to repair a broken wire going to the air bag inflator module is:
    a) by using rosin core electrical solder.
    b) by using a heat shrink butt end connector.
    c) to never repair a wire in the air bag system.
    d) to follow manufacturer’s procedure on SRS wiring repairs.

Answer 10

d) to follow manufacturer’s procedure on SRS wiring repairs.

Question 11

11. When installing electrical accessories under the dash of the truck, make sure you do
    not splice into the:
    a) red labelled wire harness.
    b) blue labelled wire harness.
    c) white labelled wire harness.
    d) yellow labelled wire harness.

Answer 11

d) yellow labelled wire harness.

Question 12

12. To prevent any damage to the clockspring in the truck when removing a steering
    gear, you must ensure that:
    a) you are familiar with the operation of the SRS system.
    b) you have Centred the steering wheel before you disconnect the gear.
    c) prevent the steering wheel from rotating while the gear is disconnected.
    d) you perform all of the tasks listed above.

Answer 12

d) you perform all of the tasks listed above.

Question 13

13. What is installed in the connectors of an air bag circuit to help prevent accidental
    deployment?
    a) locking mechanisms
    b) shorting bars
    c) gold plated pins and terminals
    d) yellow labelling

Answer 13

b) shorting bars