DSL-206 Chap 21: Body Electrical Systems-Instrumentation

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?

• a. Technician A

• b. Technician B

• c. Both Technician A and Technician B

• d. Neither Technician A nor Technician B

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?

• a. Technician A

• b. Technician B

• c. Both Technician A and Technician B

• d. Neither Technician A nor Technician B

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

• 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

Most gauges using stepper motors have __________ possible steps of positions between zero and full-scale deflection.

• a. 3000

• b. 3060

• c. 1030

• d. 1000

What type of gauge is not electrical because it depends on cables, air, or fluid pressure to operate?

• a. Mechanical gauge

• b. Bimetallic gauge

• c. Electromagnetic gauge

• d. Digital display gauge

In the __________ gauge design, the field coils are wound in series, but in opposite directions.

• a. Bipolar motor

• b. Two-coil

• c. Stepper motor

• d. Intelligent

Which of the following is an example of a gauge that can use D'Arsonval movement?

• a. Tachometer

• b. Speedometer

• c. Voltmeter

• d. Odometer

Technician A says resistive-type gauges are quickly checked by closing the circuit to the sending unit or opening the sending unit lead. Technician B says that when a circuit is opened, circuit resistance becomes low and will move a gauge to either its minimum or maximum reading. Who is correct?

• a. Technician A

• b. Technician B

• c. Both Technician A and Technician B

• d. Neither Technician A nor Technician B

Sending units are different from sensors, which are low-voltage electronic devices with __________.

• a. No moving parts

• b. Less resistance

• c. A permanent magnet

• d. More current

Temperature-sending units use __________ similar to the design of a coolant thermostat.

• a. A bimetal arm

• b. Proprietary software

• c. A flexible bellow

• d. A wax pellet