Week 4, Chapters 5 and 6 - Diesel Schematics and Practical Electrical

Question 1

Which of the following designates the throttle position sensor on a schematic or pictorial diagram?

a. TPS
b. APPS
c. EFPA
d. All of the above

Answer 1

d. All of the above

Question 2

Wiper motors use which two types of force?

Answer 2

Centrifugal and Positive Displacement

Question 3

Checking current while the circuit is connected is the purpose of ________.

Answer 3

Back-probing

Question 4

The best tool to check the complete intake manifold air temperature circuit is a ________.

Answer 4

Scan tool

Question 5

Which system do automotive horns and speakers use to operate?

Answer 5

Electromagnetism

Question 6

When the DMM is set to measure DC voltage and is connected in parallel to a load device, what is the obtained reading called?

Answer 6

Voltage drop

Question 7

A device does not work at all. The best tool for QUICKLY checking the capacity of the 12V supply circuit is a ________.

Answer 7

Test lamp

Question 8

What controls the grounding of a device or actuator?

Answer 8

ECMs

Question 9

A 16 AWG wire is best used for:

a. Low-current circuits
b. Battery main feeds
c. Computer data lines
d. 16-amp circuits

Answer 9

a. Low-current circuits

Question 10

Larger mm² wire numbers mean ________ ________ capacity.

Answer 10

higher current

Question 11

Larger AWG wire numbers mean ________ ________ capacity.

Answer 11

lower current

Question 12

The wire color “bl” means ________.

Answer 12

Blue

Question 13

Some schematics include circuit numbers. Thier function is to:

a. Indicate the total number of circuits in the system
b. Improve the tracing of the circuit through the schematic
c. Provide a reference where the circuit definition can be found
d. Both B and C

Answer 13

b. Improve the tracing of the circuit through the schematic

Question 14

If a wire crosses over to the next page of the schematic and the wire’s label changes from an 18-gauge black wire to a 16-gauge black wire, what does this most likely indicate?

Answer 14

A typographical error

Question 15

Technician A says that a pictorial diagram offers the most information for troubleshooting an electrical circuit. Technician B says that if a device is off aand has 12V present at the input terminal, you can conclude that the power circuits are okay. Which technician is correct?

Answer 15

Neither Technicians A nor B

Question 16

When using a voltmeter, the black side should be connected to which side of the circuit or component?

Answer 16

The ground side

Question 17

Which component is used for frequent temporary overloads?

Answer 17

Circuit breakers

Question 18

Fuses are rated by ________ capacity.

Answer 18

Current

Question 19

True or False?

Connect the DMM with the circuit power off.

Answer 19

True

Question 20

A DMM, using the ammeter function, should always be connected in ________ to the ________ device.

Answer 20

Series, Load

Question 21

When using the ohmmeter function of the DMM to check continuity, what does an “O.L” in the display mean?

Answer 21

An open circuit

Question 22

When using an ammeter, the red lead should be connected to which side of the connector?

Answer 22

Closest to the positive side of the battery

Question 23

When using an ohmmeter, the leads should be placed ________ with the circuit or component being tested.

Answer 23

in parallel

Question 24

The tail lamps, license plate lamps, and parking lamps are generally protected by what:

a. A Type-I circuit breaker
b. A Type-II circuit breaker
c. A 20-amp fuse
d. Three fusible links

Answer 24

c. A 20-amp fuse

Question 25

Because headlamps are an important safety feature, they are protected by: a. Heavy fuses b. Fusible links c. Type-I circuit breakers d. Type-II circuit breakers

Answer 25

c. Type-I circuit breakers

Question 26

Turn signal flasher units supply a rapid on-off-on current flow to the turn signal lamps by acting very much like \_\_\_\_\_\_\_\_.

Answer 26

circuit breakers

Question 27

Horn relays are sometimes included in the horn circuit to ________ the amount of current needed to activate the horn.

Answer 27

decrease

Question 28

The ________ switch within the wiper motor ensures that when the motor is turned off, the wiper arms will be brought to the bottom position.

Answer 28

Park

Question 29

For easy identification, ground wires on most AUTOMOTIVE electrical systems are coded which color\>

Answer 29

Black

Question 30

Technician A says that when the driver pushes the horn button, electromagnetism moves an iron bar inside the horn, which opens and closes contacts in the horn circuit. Technician B says that many vehicle horn circuits include a relay. Which technician is correct?

Answer 30

Both Technicians A and B

Question 31

Technician A says that the windshield washer pump draws a cleaning solution from a reservoir and forces it through nozzles onto the windshield. Technician B says the unit can be a positive-displacement pump or a centrifugal pump. Which technician is correct?

Answer 31

Both Technicians A and B

Question 32

Two technicians are discussing horn operation. Technician A says when the horn switch or horn relay contacts close, current flows through the horn coil to ground. The electromagnetic field created by the coil attracts the armature also moving the diaphragm. Technician B says the armature movement closes the contact points, which opens the coil circuit. Which technician is correct?

Answer 32

Technician A only