BC automotive week 7

Which of the following is/are true about the primary ignition system?

The primary side of the ignition system is the low-voltage side.

 The ignition spark comes from the primary part of the system.

 Both A and B.

 Neither A nor B.

The primary side of the ignition system is the low-voltage side.

Technician A says that the high-voltage surge to the spark plug is created in the coil when electricity stops flowing in its primary winding. Technician B says that the spark impulse comes from the ­primary winding when the magnetic field in the secondary winding breaks down. Who is right?

Technician A

 Technician B

 Both A and B.

 Neither A nor B.

Technician A

Technician A says that using a spark plug with too hot a heat range can cause preignition. Technician B says that using a spark plug with too hot a heat range can result in a burned piston. Who is right?

A only

B only

Both A and B

Neither A nor B

Both A and B

Which of the following is/are true about resistance spark plug cables?

Resistance in the cables raises the firing ­voltage level.

Raising the resistance lowers radio interference

Both A and B

Neither A nor B

Both A and B

Which of the following is/are true about resistor spark plugs?

Some resistor spark plugs have carbon resistors.

Some spark plugs have semiconductor resistors.

Both A and B

Neither A nor B

Some resistor spark plugs have carbon resistors.

Most electronic ignition systems control the flow of current on the ___________ side of the coil.

Ground

Positive

Voltage

Magnetic

Ground

On an eight-cylinder engine running at 3,000 rpm, the ignition system produces a spark ___________ times every second

25

100

200

10

200

Which of the following ignition triggers works best at any speed?

A magnetic pickup trigger

A hall-effect switch

Both A and B

Neither A nor B

A hall-effect switch

All of the following are true about spark timing control except:

Timing adjusts to compensate for engine speed.

 Timing adjusts to compensate for engine load.

 Timing advances when the mixture is leaner.

Timing is varied so combustion can be ignited by 23 degrees before top dead center (BTDC).

Timing is varied so combustion can be ignited by 23 degrees before top dead center (BTDC)

Which of the following is/are true about a waste spark system?

Spark plugs for companion cylinders fire every revolution of the crankshaft.

Two cylinders share one coil

Both A and B

Neither A nor B

Both A and B

Which type of fuel injection do most new vehicles use?

Continuous

Sequential port

Throttle body

none of the above

Sequential port

All of the following are electronic fuel injection systems except:

Continuous fuel injection

port fuel injection

central fuel injection

Throttle-body injection

Continuous fuel injection

Technician A says that when there is a rich air-fuel mixture, the oxygen sensor will give a signal that is higher than 0.5 volt. Technician B says that if there is a low-voltage signal (0.4 volt or less) coming from the oxygen sensor, the computer will drive the system rich. Who is right?

A only

B only

Both A and B

Neither A nor B

Both A and B

Technician A says that the computer on some fuel injection systems pulses several injectors at the same time. Technician B says that the computer on some fuel injection systems pulses each fuel injector individually. Who is right?

A only

B only

Both A and B

Neither A nor B

Both A and B

Technician A says that a speed density fuel injection system uses an airflow sensor. Technician B says that an air density system uses a manifold pressure sensor. Who is right?

A only

B only

Both A and B

Neither A nor B

Neither A nor B

All of the following are functions of the fuel system except

store fuel

deliver fuel

mix fuel with air

ignite fuel

ignite fuel

The ideal or stoichiometric air/fuel mixture is _____ air to _____ fuel by weight.

1 to 14

1 to 14.7

14 to 1

14.7 to 1

14.7 to 1

The number one cause of fuel pump failures is:

it was designed by GM

restricted fuel filter

bad fuel

operating the vehicle with low fuel levels in the tank

restricted fuel filter

All of the following are devices that make up an automotive computer control system except:

computer

sensors

processing

Actuators

processing

Technician A says Gasoline Direct Injection (GDI) use a spark plug to ignite the fuel. Technician B says diesel fuel injection uses a glow plug to ignite the fuel. Who is right?

A only

B only

Both A and B

Neither A nor B

A only

When an air-fuel mixture is too rich, which of the following gases will increase?

Hydrocarbons

 Carbon monoxide

both A and B
Neither A nor B

Both A and B

Which of the following is/are true about crankcase ventilation systems?

 The system does not work unless the vehicle is moving.

 The system is called a PVC system.

 During an explosion in the crankcase, the valve opens all the way.

There is a metered vacuum leak to the crankcase.

There is a metered vacuum leak to the crankcase.

Technician A says that air injection lowers HC and NO_x in the exhaust. Technician B says that air injection heats the catalytic converter when it is cold. Who is right?

A only

B only

Both A and B

Neither A and B

B only

Which of the following are results of high combustion temperatures?

An increase in hydrocarbons

An increase in oxides of nitrogen

Cooler spark plug temperatures

An increase in global warming

An increase in oxides of nitrogen

Technician A says that NO_x forms when the engine is under load. Technician B says that NO_x forms when the engine is hot. Who is right?

A only

B only

Both A and B

Neither A nor B

Both A and B

When is the EGR valve open?

At idle

during engine cranking

Both A and B

Neither A nor B

Neither A nor B

Each of the following is a true statement about catalytic converters except:

 Some catalytic converters have a tube in the center attached to the air injection system.

 The reduction catalyst reduces oxides of nitrogen.

 An oxidation catalyst reduces HC and CO.

A monolithic converter has platinum-coated beads.

A monolithic converter has platinum-coated beads.

What is a catalytic converter with an air tube called?

A single bed catalyst

A dual bed catalyst

Both A and B

Neither A nor B

A dual bed catalyst

Technician A says that if air is directed downstream during closed loop, the computer will drive the fuel system lean. Technician B says that if air is directed upstream during closed loop, the computer will drive the fuel system rich. Who is right?

A only

B only

Both A and

Neither A nor B

B only

Which of the following emissions is lowered using the EGR valve?

Hydrocarbons

Carbon monoxide

Oxides of nitrogen (NOx)

Carbon dioxide

Oxides of nitrogen (NOx)