Exam 16: General Electrical System Diagnostics and Service

The black DMM test lead always plugs into the COM input jack.

What is a short circuit?

Other than measure voltage, current and resistance most DMMs (DVOMs)can also measure and test what other factors?

What units of measurement are used to measure frequency?____________________

____________________ solder is used to repair electrical wiring.

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 do to test the fan motor current?

Which piece of information about the vehicle's wiring cannot be found in the electrical schematics?

Technician A says a circuit breaker can be reset after the problem that tripped the circuit breaker is fixed by disconnecting the power to the circuit breaker for a few seconds. Technician B says the circuit breaker can be reset by pressing the reset button on the breaker. Who is correct?

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

A technician tests 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 checks the coil input terminal for voltage. Technician B connects a jumper wire between battery negative and the output terminal of the relay to check if the load is the problem. Who is correct?

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?

When testing the high-voltage circuits on a hybrid vehicle, a _____type meter and test leads must be used.

An ohmmeter can be used to check for continuity.

While discussing how to test a switch, Technician A says the action of the switch can be monitored by a voltmeter. Technician B says the continuity through the switch can be checked by measuring the resistance across the switch terminals using an ohmmeter. Who is correct?

Resistance checks are being discussed. Technician A says the component must be disconnected from the system before checking. Technician B says an infinite reading means the component is shorted. Who is correct?

The waveform of AC voltage is typically a _____.

Connecting an ohmmeter into a live circuit can damage the meter.

Technician A says electrical circuit resistance causes voltage drop. Technician B says high-resistance problems cause an increase in current flow. Who is correct?

Analog meters should not be used to test electronic components.

DMMs that can measure temperature use a _____ adapter that is placed on or near the object to be checked.