Week 8 Chapter 21 Test Questions

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In older vehicles, what will supply a circuit to provide a ground and/or positive battery voltage path to illuminate instrument warning lights?

Select one:

a. Voltage regulator

b. Ignition key

c. Electronic switch

d. Sender unit

b. Ignition key

Which of the following best describes the prove-out sequence?

Select one:

a. A sequence in which the warning lights illuminate for several brief seconds after the ignition is switched off

b. A sequence in which the warning lights illuminate for several brief seconds after the ignition is switched on

c. A sequence in which the warning lights illuminate for several brief seconds while the engine is running

d. A sequence in which the warning lights for illuminate for several brief seconds when first put in gear

b. A sequence in which the warning lights illuminate for several brief seconds after the ignition is switched on

In the three-coil gauge, current flow passes through all three coils when _____ through the sending unit ground path is high.

Select one:

a. Amperage

b. Magnetic field strength

c. Temperature

d. Resistance

d. Resistance

What is needed to translate the CAN messages to the instrument cluster?

Select one:

a. CANBUS

b. Custom programming by the OEM

c. Custom programming by SAE

d. J1939 communications

b. Custom programming by the OEM

What type of indicator light is an example of a light operated through voltage drop?

Select one:

a. Parking brake

b. Body door

c. Charging system

d. Supplemental restraint

c. Charging system

_____ are microcontroller devices constructed to sense and measure any source of magnetic fields.

Select one:

a. Electronic compasses

b. Sending units

c. CAN networks

d. Liquid crystal displays

a. Electronic compasses

Older mechanical _____ used a pen and ink to plot speed on a rotating paper disk that completed one revolution in 24 hours.

Select one:

a. Speedometers

b. Tachographs

c. Tachometers

d. Odometers

b. Tachographs

What types of switches are set at the factory for an original equipment pulse count?

Select one:

a. Normally opened pressure switches

b. Normally closed pressure switches

c. Mechanical ground switches

d. DIP switches

d. DIP switches

Technician A says that scratch resistance is not one of the advantages of resistive touchscreen. Technician B says that dual-finger touch process is one of the advantages of resistive touchscreen. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

d. Neither Technician A nor Technician B

What is the process cause of nonavailability of data on the CAN instrument gauge display?

Select one:

a. Defective sending unit or gauge

b. Sender unit wires shorted to ground

c. Sender unit wires shorted to power

d. Missing terminating resistors

d. Missing terminating resistors

Technician A says the types of displays, warning lights, and gauges are the same among vehicles and manufacturers but break down into common gauge groups, sensing, and input systems. Technician B says monitoring engine operation involves measuring pressure and temperature of the lubrication, cooling, and air induction system. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

b. Technician B

What types of codes are often used by some manufacturers to provide fault code data for a specific system?

Select one:

a. Warning codes

b. Switch codes

c. Blink codes

d. Blank codes

c. Blink codes

What type of motor has a common connection between the motor stator?

Select one:

a. Unipolar stepper motor

b. Bipolar stepper motor

c. Polar stepper motor

d. Stepper motor

a. Unipolar stepper motor

What does a fuel tank sending unit use as an electrical contact?

Select one:

a. Commuter

b. Resistive wiper

c. Bucking coil

d. Stator

b. Resistive wiper

Technician A says that most sending units are a variable resistive type. Technician B says that sending units are exactly the same as sensors. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

a. Technician A

Technician A says that electronic compasses are microcontroller devices constructed to sense and measure any source of magnetic fields. Technician B says that electronic compasses make use of Hall effect-type sensors. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

c. Both Technician A and Technician B

Sources of magnetic fields in commercial vehicles include permanent magnets in _____.

Select one:

a. Traction control

b. Parking brakes

c. Body odors

d. Audio speakers

d. Audio speakers

_____ can confuse capacitance-type touchscreens.

Select one:

a. Dual-finger touch

b. High humidity

c. Heat

d. Gloves

b. High humidity

Technician A says that the connections should be verified if erratic gauge readings are found. Technician B says that continuity checks of stepper motor coils must be done if erratic gauge readings are found. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

a. Technician A

Technician A says pneumatic switches are the most common way warning lights are illuminated in today’s vehicles. Technician B says warning lights provide easily understood information to alert the equipment operator to potentially dangerous operating conditions. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

b. Technician B

Technician A says that a charging system indicator light may operate through voltage drop. Technician B says that a charging system light has a ground circuit applied to each side of the bulb. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

a. Technician A

If gauges do not respond with a prove-out sequence when ignition is switched on, a possible cause could be _____.

Select one:

a. Loose connections at sender unit and/or gauge

b. The sender unit wires shorted to ground

c. The sender unit wire is disconnected

d. A defective stepper motor

d. A defective stepper motor

Which of the following is a way to activate low air pressure, antilock brake faults, and low diesel exhaust fluid alerts?

Select one:

a. Toggle switches

b. Voltage drop circuits

c. Parallel circuits

d. Series circuits

b. Voltage drop circuits

Technician A says that the mechanical ground switches are used to indicate low fluid levels, low air pressure warning systems, or power divider engagement locks. Technician B says that electronic switches are most commonly used for warning lights. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

c. Both Technician A and Technician B

Technician A says that, in today’s vehicles, the ignition key will supply a circuit to provide a ground and/or positive battery voltage path to illuminate instrument warning lights. Technician B says that in order to validate the correct operation of a warning light, the instrument cluster is designed to illuminate a bulb for up to 1 minute with the key on and engine off, or during key-on engine cranking. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

d. Neither Technician A nor Technician B

In order to validate the correct operation of a warning light, the instrument cluster is designed to illuminate a bulb for several brief seconds with the key on and engine off, or during key-on engine cranking. This sequence is called a(n) _____ sequence.

Select one:

a. Self-diagnostic

b. Instrumentation

c. Charging

d. Prove-out

d. Prove-out

All of the following are examples of direct reading mechanical gauges, EXCEPT:

Select one:

a. Speedometer

b. Oil pressure

c. Voltmeter

d. Air pressure

c. Voltmeter

In the _____ gauge design, the middle coil is called a bucking coil.

Select one:

a. Two-coil

b. Three-coil

c. Five-coil

d. Four-coil

b. Three-coil

Which of the following statements is true of bipolar motors?

Select one:

a. They cannot provide directional rotational changes.

b. They have a common connection between the motor stator.

c. They can reverse current flow through individual coils.

d. They provide high torque output.

c. They can reverse current flow through individual coils.

Technician A says that unlike unipolar steppers, bipolar stepper motors have no common connection between the motor stator. Technician B says directional changes are possible in unipolar stepper motors, but not in bipolar stepper motors. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

a. Technician A

How many wires connect the instrument panel gauge cluster to the CAN?

Select one:

a. 2

b. 3

c. 4

d. 5

a. 2

In bimetallic gauges, heat produced through _____ of a wire coil wrapped around the bimetal strip is proportional to current flow.

Select one:

a. Capacitance

b. Electrical pulses

c. Voltage

d. Resistance

d. Resistance

A _____ gauge is a type of electromagnetic gauge that moves a pointing needle directly proportional to current flow through an electromagnet attached to the pointer.

Select one:

a. D’arsonval

b. Bimetal fuel

c. Stepper motor

d. Digital CAN

a. D’arsonval

Technician A says that a unipolar stepper motor can be identified by its five or six wires that connect four field coils. Technician B says that the ends of all the coils of a unipolar motor have one common connection that is supplied power. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

c. Both Technician A and Technician B