Deck 37: Ignition System Fundamentals

Question 1

Which of the following statements is LEAST-Likely true?

A)Hypalon has better high-temperature resistance than Silicone.
B)EI systems are similar to the electromechanical contact point systems they replaced.However, electronic systems are far superior and require very little maintenance.
C)Nonelectronic ignition systems used mechanical contact points to alternatively energize and then open the primary ignition circuit.
D)Most ignition systems control primary current flow on the ground side of the coil.

Answer 1

A

Question 2

When there are fewer coils in the primary part of a transformer, it is a step-down transformer.

Answer 2

False

Question 3

Fouling means that the spark plug gets covered with material, and a spark will not easily jump its gap.

Answer 3

True

Question 4

The sensor that will MOST-Likely determine the speed of the engine and the position of the crankshaft is the:

A)EI sensor
B)DIS sensor
C)CKP sensor
D)Hall-effect sensor

Question 5

Which of the following is LEAST-Likely a type of sensor?

A)Permanent magnet AC generator
B)Magnetoresistive sensor
C)Optical sensor
D)Reach sensor

Question 6

A(n) ____ vacuum is used to sense the load on an engine.

A)intake manifold
B)powertrain
C)crank angle
D)battery

Question 7

The four types of sensors that trigger spark timing are the Hall switch, the magnetorisistive sensor, the optical sensor and the ____________________ AC generator.

Question 8

While having a discussion, Technician A says that a Hall-effect signal generates an AC signal. Technician B says that it does not generate a signal. Rather its signal is a rise in voltage, followed by a drop in voltage. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 9

Spark plugs often have an internal resistor that lowers the firing voltage output of the coil.

Question 10

In the ____________________ process, current is passed through a thin semiconductor material while a magnetic field passes through it.

Question 11

The sensor that MOST-Likely uses a beam of light to control the primary circuit is the:

A)Hall-effect sensor
B)MR sensor
C)photoelectric sensor
D)crank angle sensor

Question 12

Every spark plug has a specified ____________________ that indicates how fast heat can travel away from the spark plug center electrode into the water jackets in the cylinder head.

Question 13

All of the following statements are true EXCEPT:

A)a throttle position sensor (TPS) sends a voltage signal to the computer that relays throttle position.
B)a manifold absolute pressure (MAP) sensor or mass airflow sensor (MAF) provides intake manifold pressure data to the computer.
C)the primary trigger in the distributor or on the crankshaft gives the computer the ability to interpret engine speed.
D)a knock sensor provides information to the computer so it can make adjustments as engine temperature changes.

Question 14

While having a discussion, Technician A says that the length of time required for ignition coil primary winding saturation varies with engine speed. At low engine rpm, dwell is longer. Technician B says that at low engine rpm, there is more time between cylinder firings than at high speeds, so dwell time can be shorter. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 15

____________________ is the length of time that current is flowing in the coil primary winding.

Question 16

____________________ time depends on the amount of current flowing in the primary winding.

Question 17

All of the following statements are true EXCEPT:

A)in SAE terminology, ignition systems without distributors are known as EI.
B)EI has no rotor or distributor cap but always has spark plug cables.
C)a typical crank or cam sensor has a spaced ring with one or more unevenly spaced teeth from which the computer can determine crankshaft position.
D)advantages of EI include reduced cost and lower maintenance.

Question 18

When an eight-cylinder engine is running at 3,000 rpm, its ignition coil must do remarkable things. If a single coil is used, its magnetic field must be able to build up and collapse 200 times in 1 second.

Question 19

The length of the threaded area of a spark plug is called its ____.

A)heat range
B)reach
C)trigger
D)dwell

Question 20

Coil-on-plug (COP) ignition systems supply a spark to each cylinder through individual spark plug cables.

Question 21

What are the advantages of a Hall switch, compared to an AC generator?

Question 22

What is the advantage of a CKP sensor with more than one trigger?

Question 23

What is the difference between a magnetoresistive (MR) sensor and a Hall sensor?

Question 24

What is the purpose of the ignition coil?

Question 25

List five parts of the primary ignition system.