Exam 16: General Electrical System Diagnostics and Service

A technician is testing a circuit that uses a ground-controlled relay to provide power to the circuit load. With the relay installed in its socket, the control terminal of the relay is grounded by a jumper wire; nothing happens. Technician A says check the coil input terminal for voltage. Technician B says connect a jumper wire between battery negative and the output terminal of the relay to check if the load is the problem. Who is correct?

A technician is checking a circuit with excessive resistance. The current flow through the circuit should be 10 amps, but a check with an ammeter measures only 6 amps. The technician measures a voltage drop of 1.0 volts across the switch terminals when the circuit is turned on. What is the resistance of the switch?

Technician A says dielectric grease is used on wire terminals and connectors to prevent corrosion. Technician B says dielectric grease reduces the resistance between the terminals. Who is correct?

If rosin core solder is not available, acid core solder can be used as a substitute.

Technician A uses heat shrink tubing to insulate and seal soldered wire connections. Technician B wraps the soldered connection with electrical tape. Who is correct?

What units of measurement are used to measure frequency?____________________

The radiator fan on a vehicle is working, but it is turning at a much slower speed than normal. The specifications for the fan motor are 25 amperes. Your DMM has a maximum amperage of 10 amps. What should you use to test the fan motor current?

A technician is testing a connector in a circuit with a voltmeter. With the power on in the circuit, the meter reads 12 volts when the leads are placed on each side of the connector. This indicates that the connector _____.

The waveform of AC voltage is typically a _____.

A voltmeter is connected in ____________________ with the circuit.

What is the best tool to use to find the cause of an intermittent problem in a low-voltage DC circuit?

A circuit is open when it is complete.

Technician A uses the electrical schematic diagram to trace the flow of current through all the switches, wires, connectors, circuit protection devices, and grounds related to the problem before he begins testing. Technician B uses the schematic diagram to locate exactly where on the vehicle all of the circuit components are located. Who is correct?

When connecting a conventional ammeter to a circuit, _____.

A beeping noise coming from the DMM when the function selector is set to ohms indicates that the circuit has ____________________.