CH.10 REVIEW

1. Which of the following statements about self- powered test lights is correct?

Self-powered test lights are like regular test lights except that they contain a 1.5-volt battery.

Self-powered lights can be used to check for both open circuits and grounded circuits when either chassis power or ground

The internal battery can supply current needed to illuminate the light.

All of the choices are correct.

3.Which of the following is NOT correct concerning electrical measurement with multimeters?

Three types of measurements-voltage, resistance, and amperage-can be taken from circuits in three different ways.

An ohmmeter uses a small amount of electrical current from an internal battery and sends it through a circuit or component.

The circuit must never be powered when connected to an ohmmeter.

When using an ohmmeter, it is necessary to observe polarity when connecting test leads.

5.Which of the following statements about inductive amp clamps is correct?

In powered circuits, inductive amp clamps placed around a conductor are used to measure amperage.

These devices work by measuring a conductor's magnetic field strength, which is proportional to amperage

Both In powered circuits, inductive amp clamps placed around a conductor are used to measure amperage and These devices work by measuring a conductor's magnetic field strength, which is proportional to amperage.

Neither In powered circuits, inductive amp clamps placed around a conductor are used to measure amperage nor These devices work by measuring a conductor's magnetic field strength, which is proportional to amperage.

7.Which of the following statements about the diode scale is correct?

The low-voltage settings of an ohmmeter may not properly evaluate a diode, as a good silicon diode requires approximately 0.5-0.7 volts to forward bias or conduct current.

Below 0.5-0.7 volts, the diode may appear to block current in both directions; when placed in the diode range, a meter will put out higher voltage than barrier voltage of 0.7 volts to cause the diode to reverse and forward bias.

Both The low-voltage settings of an ohmmeter may not properly evaluate a diode, as a good silicon diode requires approximately 0.5-0.7 volts to forward bias or conduct current. and Below 0.5-0.7 volts, the diode may appear to block current in both directions; when placed in the diode range, a meter will put out higher voltage than barrier voltage of 0.7 volts to cause the diode to reverse and forward bias.

Neither The low-voltage settings of an ohmmeter may not properly evaluate a diode, as a good silicon diode requires approximately 0.5-0.7 volts to forward bias or conduct current. nor Below 0.5-0.7 volts, the diode may appear to block current in both directions; when placed in the diode range, a meter will put out higher voltage than barrier voltage of 0.7 volts to cause the diode to reverse and forward bias.

8.Which of the following statements about graphing meters is NOT correct?

One of the latest diagnostic tools is a digital graphing meter used to analyze electrical waveforms produced by sensors, motors, actuators, and alternators.

Graphing meters plot an electrical value of a signal over time, displaying an easy-to-read graph with signal value on the x-axis and the time on the y-axis.

Component serviceability can be determined by analyzing the waveform or comparing it to known signals of good quality.

A Hall effect sensor may have intermittent problems that may not be detected by the vehicle's on-board diagnostic system.

9.Which of the following statements about scanners is correct?

A variety of scanner types are used to read serial data from a vehicle data link connector.

The scanner uses software to translate the serial data into a format that can be read by the technician.

More sophisticated scanners use bi-directional communication between the tool and the ECM to send commands that can actuate output devices, or cause the ECM to enter diagnostic routines such as performing cylinder cut-out tests.

All of the choices are correct

10.Which of the following is included in the SAE J-1978 requirements?

Obtaining and displaying Diagnostic Trouble Codes (DTCs)

Obtaining and displaying emissions-related data from engine parameters

Both Obtaining and displaying Diagnostic Trouble Codes (DTCs) and Obtaining and displaying emissions-related data from engine parameters.

Neither Obtaining and displaying Diagnostic Trouble Codes (DTCs) nor Obtaining and displaying emissions-related data from engine parameter

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