Electrical 2

True or False. Volts, amps, and ohms are the three basic units of electrical measurement.

• a. True

• b. False

Answer explanation

True. Volts (V), amps (A), and ohms (Ω) are indeed the three fundamental units of electrical measurement, representing voltage, current, and resistance, respectively.

Total circuit resistance is equal to the ____ of the individual resistances.

• Product

• Sum

• Remainder

• None of the above

Answer explanation

Total circuit resistance in a series circuit is equal to the sum of the individual resistances. Therefore, the correct answer is 'Sum', as it accurately describes how resistances combine in this configuration.

Technician A says when the resistances in a parallel circuit are not equal, then the current divides in accordance with the value of each resistance, but the total current flow is still the sum of the currents flowing in each branch. Technician B says all components in a parallel circuit are connected directly to the same voltage supply. Who is correct?

• Technician A

• Technician B

• Both Technicians A and B

Answer explanation

Technician A is correct about current division in parallel circuits, while Technician B correctly states that all components share the same voltage. Therefore, both technicians are correct.

Two technicians are discussing multiplexing and automotive networks. Technician A states that one such multiplex system is a CANbus. Technician B states that networking is common on vehicles today reduce system cost, save weight, and improve reliability. Which technician is correct?

• Technician A

• Technician B

• Both Techs A and B

• Neither Technician A nor B

Answer explanation

Technician A is correct as CANbus is indeed a multiplexing system used in vehicles. Technician B is also correct since networking in vehicles helps reduce costs, save weight, and improve reliability. Therefore, both technicians are correct.

Acid flux is designed to be used on non-electrical metal joints such as radiators and must be removed after the soldering process so that the joint does not corrode.

• True

• False

Answer explanation

True. Acid flux is used on non-electrical metal joints and must be removed after soldering to prevent corrosion of the joint.

The primary coil typically has _____ turns of light-gauge wire and the secondary has approximately 30,000 to 60,000 turns of very fine wire.

• 50 to 100

• 100 to 200

• 200 to 300

• 400 to 500

Answer explanation

The primary coil typically has 50 to 100 turns of light-gauge wire, which is significantly fewer than the secondary coil's 30,000 to 60,000 turns of very fine wire, making 50 to 100 the correct choice.

Two technicians are discussing multiplexing and automotive networks. Technician A states that one such multiplex system is a CANbus. Technician B states that networking is common on vehicles today reduce system cost, save weight, and improve reliability. Which technician is correct?

• Technician A

• Technician B

• Both Techs A and B

• Neither Technician A nor B

Answer explanation

Technician A is correct as CANbus is indeed a multiplexing system used in vehicles. Technician B is also correct because networking in vehicles helps reduce costs, save weight, and improve reliability. Therefore, both technicians are correct.

Wiring diagrams give information about: Select one:

• electrical circuits and their components.

• voltage throughout a circuit.

• current flow to components.

• circuit resistance.

Answer explanation

Wiring diagrams primarily provide information about electrical circuits and their components, illustrating how they are connected and function together. This makes the first choice the correct answer.

Tech A says that when reading DC voltage on a meter, a + before the number means that the probing lead is touching something more positive than the common lead. Tech B says that a ?

Answer explanation

Tech B likely explains that a - before the number indicates the probing lead is touching something more negative than the common lead. This aligns with standard DC voltage measurement conventions.

When probing wires, you should do all these, EXCEPT: Select one: a. back probe when possible. b. use very fine pins to reduce the possibility of damage. c. reinsulate the hole with room temperature vulcanizing (RTV) silicone. d. always reinsulate the hole that the probe makes to prevent any corrosion.

• back probe when possible.

• use very fine pins to reduce the possibility of damage.

• reinsulate the hole with room temperature vulcanizing (RTV) silicone.

• always reinsulate the hole that the probe makes to prevent any corrosion.

Answer explanation

The correct choice is 'reinsulate the hole with room temperature vulcanizing (RTV) silicone.' This is not a standard practice for probing wires, as it may not effectively prevent corrosion compared to other methods.