Exam 19: Charging Systems

Voltage regulator circuitry in the computer control module controls AC generator output by ______.

AC generators produce overlapping sine waves known as three-phase voltage.

The voltage regulator controls voltage by varying the field current through the rotor.

____________________ braking is the process of using the motor/generator to convert kinetic energy into electrical energy to recharge the batteries while slowing the vehicle.

PCM stands for ______________________.

Voltage regulators are being discussed. Technician A says charging voltage is decreased when the battery temperature is low because the battery cannot accept high charging rates at low temperatures. Technician B says the voltage regulator increases the current flowing through the field coil when the battery voltage is low. Who is correct?

How does a voltage regulator control AC generator voltage output?

The alternating current produced by the AC generator is rectified into DC (direct current)through the use of ______.

On a B circuit AC generator, the regulator is on the negative side of the circuit.

A lab scope can be used to check for open or shorted diodes in the rectifier.

What is the purpose of the fail-safe circuit contained with many voltage regulators?

Oscilloscope patterns are being discussed; Technician A says an open or shorted diode can be detected by the waveform on a lab scope without removing the generator from the vehicle. Technician B says the waveform produced by the AC generator after the output moves through the diodes is a straight line because it is a constant DC voltage. Who is correct?

During a voltage output test the recommended engine rpm is around ____________________ rpm.

Technician A says increasing the strength of the magnetic field in an AC generator increases the voltage output. Technician B says the voltage regulator controls the strength of the rotor's magnetic field. Who is correct?

"A one-way check valve for electric current" is a good description of a ____________________.

Testing the voltage regulator circuit by full fielding the alternator is a common diagnostic technique on modern cars.

Technician A says an a circuit has the regulator on the positive side of the field coil. Technician B says on an isolated field circuit, the regulator may be on the negative or the positive side. Who is correct?

Regenerative braking is used by both hybrid and non-hybrid vehicles.

Which part of the AC generator produces the moving magnetic field?

What type of test equipment is needed to perform a charging system current output test?