Automotive Mechanics 2, 9th Edition By May – Test Bank

Chapter 11 Testbank Key

1. (p. ) Where is the high voltage required to ionise a spark-plug gap produced?
The ignition coil. Ignition coils operate on the principle of electromagnetic induction. The nominal 12 volts of the vehicle’s electrical system is stepped up to the extremely high voltage of the secondary.

Competency: AURETR3031 Diagnose and repair ignition systems
Difficulty: Easy
Section: Ignition system components and their function

2. (p. ) What is meant by the heat range of a spark plug, and how is it controlled?
It is the temperature at which a spark plug operates. This temperature depends on the distance that the heat must travel from the insulator to reach the outer metal shell of the plug and enter the cylinder head.

Competency: AURETR3031 Diagnose and repair ignition systems
Difficulty: Medium
Section: Spark-plug identification

3. (p. ) What replaces the ignition breaker points and switches the coil primary circuit in electronic ignition systems?
The power transistors operate the coil primary circuit.

Competency: AURETR3031 Diagnose and repair ignition systems
Difficulty: Medium
Section: Electronic ignition systems

4.
The resistance in an ignition secondary circuit used to dampen interference from firing voltages is found:

A.
in one or any combination of the given answers

B.
as a resistor within special spark plugs

C.
in resistor-type spark-plug connectors

D.
within the core material of spark-plug cables

Competency: AURETR3031 Diagnose and repair ignition systems
Difficulty: Medium
Section: Spark plug service

5.
For distributors with adjustable base timing, the timing light inductive pickup lead would be connected to:

A.
the number 1 spark-plug cable

B.
a special timing connector provided for electronic control units

C.
the ignition coil to the distributor high-tension cable to check all cylinders

D.
the number 1 injector wiring

Competency: AURETR3031 Diagnose and repair ignition systems
Difficulty: Medium
Section: Distributor service

6. (p. ) With the ignition switch ON, a spark is produced every time that the primary circuit is opened.
TRUE

Competency: AURETR3031 Diagnose and repair ignition systems
Difficulty: Medium
Section: Ignition system components and their function

7. (p. ) Colder-running engines during slow-speed operation require a colder heat-range spark plug.
FALSE

Competency: AURETR3031 Diagnose and repair ignition systems
Difficulty: Easy
Section: Spark-plug identification

8. (p. ) A spark plug with too cold a heat range would most probably cause more carbon and soot build-up.
TRUE

Competency: AURETR3031 Diagnose and repair ignition systems
Difficulty: Medium
Section: Spark-plug identification

9. (p. ) Iridium and platinum are both commonly used in some:
A. high-tension leads
B. ignition modules
C. spark plugs
D. ignition coils

Competency: AURETR3031 Diagnose and repair ignition systems
Difficulty: Easy
Section: Spark-plug identification

10. (p. ) A ballast resister is incorporated to:
A. improve point life
B. assist starting
C. improve starter operation
D. increase performance under load

Competency: AURETR3031 Diagnose and repair ignition systems
Difficulty: Medium
Section: Types of ignition system