Question 1

An ohmmeter should be connected to the circuit or component being tested ________.
A) in series
B) only when no power is flowing (electrically open circuit)
C) in parallel
D) Both B and C

Accepted Answer

An ohmmeter should be connected to the circuit or component being tested when there is no power flowing through it (electrically open circuit) in order to prevent damage to the ohmmeter. It should be connected in parallel for measuring resistance and in series for measuring continuity. Therefore, both B and C are correct choices.

Question 2

When using a test light to probe for electrical power, the alligator clip is connected to ________.
A) a clean metal part of the body
B) the battery negative terminal
C) the battery positive terminal
D) Either A or B

Accepted Answer

B

Question 3

When testing a diode with the multimeter set on "Diode Check" a reading of 0.6 volts is obtained. This indicates that the diode being tested is a(n) ________.
A) light emitting diode (LED)
B) open diode
C) silicon diode
D) shorted diode

Accepted Answer

A reading of 0.6 volts on a diode check setting typically indicates a silicon diode, which has a forward voltage drop of approximately 0.6 to 0.7 volts. LEDs and other types of diodes may have different forward voltage drops, and an open or shorted diode would not produce a reading in this range.

Question 4

Which is the highest reading?
A) 38.7 mV
B) 0.1 V
C) 0.387 V
D) 0.01 V

Accepted Answer

0.387 V is equivalent to 387 mV, which is higher than the other options listed.

Question 5

Which of these is safe for use in circuits with electronic components?
A) LED test light
B) Continuity tester
C) Both A and B
D) Neither A nor B

Accepted Answer

LED test lights are generally safe for use with electronic components as they typically have a high input impedance, reducing the risk of damaging sensitive components. Continuity testers, on the other hand, can apply a voltage that might damage electronic components.

Question 6

Which device illuminates a different color when connected to power or ground sides of a circuit?
A) LED test light
B) Logic probe
C) Both A and B
D) Neither A nor B

Accepted Answer

The answer of Which device illuminates a different color when...

Question 7

Which device may be useful for testing hall effect sensors?
A) Low power test light
B) Logic probe
C) Both A and B
D) Neither A nor B

Accepted Answer

A logic probe is useful for testing hall effect sensors as it can detect digital signals, which are typically output by these sensors. A low power test light is not suitable for this purpose.

Question 8

When using a DMM, the black lead usually goes in which port?
A) 10A
B) COM
C) VDC
D) None of these

Accepted Answer

The black lead is typically connected to the common (COM) port on a DMM.

Question 9

kHz is a unit describing what property?
A) Diode bias
B) Continuity
C) Frequency
D) None of these

Accepted Answer

kHz is a unit used to describe frequency, specifically, kilohertz (thousands of hertz). It is commonly used in electronics and telecommunications to describe the frequency of signals and oscillators.

Question 10

Ammeters should be connected ________ with the circuit being tested.
A) in series
B) across a load
C) in parallel
D) None of these

Accepted Answer

Ammeters are designed to measure the current flowing through a circuit. To do this, they must be connected in series with the circuit being tested, meaning they are inserted in the path that the current flows through. If the ammeter is connected in parallel, it will create a low resistance path for the current to bypass the intended load, potentially damaging the ammeter and providing inaccurate readings. Therefore, the correct method is to connect an ammeter in series.

Question 11

To prevent blowing the meter fuse in a DMM ________.
A) install a fuse in line with the meter lead
B) never test resistance of an energized circuit
C) Both A and B
D) Neither A nor B

Accepted Answer

Installing a fuse in line with the meter lead and never testing the resistance of an energized circuit are both measures to prevent blowing the meter fuse in a Digital Multimeter (DMM).

Question 12

Which type of ammeter can measure current when clamped around a conductor?
A) Selective
B) Reluctive
C) Inductive
D) None of these

Accepted Answer

An inductive ammeter can measure current when clamped around a conductor. It works on the principle of magnetic induction and measures the magnetic field generated by the current flowing through the conductor. It is also commonly referred to as a clamp-on ammeter.

Question 13

The ability to measure AC current is useful when diagnosing ________.
A) alternator function
B) resistance in a battery cable
C) starter motor operation
D) None of these

Accepted Answer

AC current measurement is useful when diagnosing alternator function, as alternators produce AC current. It is not useful for diagnosing resistance in a battery cable or starter motor operation, as those relate to DC current.

Question 14

The internal resistance of any meter is only effective if the meter is set on the ________ scales.
A) ammeter
B) ohmmeter
C) voltmeter
D) None of these

Accepted Answer

The internal resistance of a meter is effective only on the voltmeter scales. This is because in a voltmeter, the internal resistance is connected in series with the circuit being measured, affecting the total resistance and ultimately the voltage measurement. In ammeter and ohmmeter scales, the internal resistance is connected in parallel with the circuit being measured, which does not affect the current or resistance measurements.

Question 15

When measuring resistance, a reading of OL on the DMM indicates ________.
A) an open circuit
B) a defective meter probe
C) continuity of the circuit
D) None of these

Accepted Answer

OL on a DMM indicates an open circuit, meaning there is no pathway for current to flow through. This could be due to a broken wire, an open switch, or a disconnected component.

Question 16

When interpreting meter readings in autoranging mode ________.
A) convert the reading prefix to base units if needed
B) note the prefix indicated by the meter
C) Both A and B
D) Neither A nor B

Accepted Answer

In autoranging mode, the meter automatically adjusts the range of measurements based on the value being measured. Therefore, it is important to interpret the reading prefix and convert it to base units if necessary (Choice A) in order to properly understand the measurement. Additionally, noting the prefix indicated by the meter (Choice B) can provide important context for the magnitude of the measurement. Therefore, both choices A and B are necessary for the proper interpretation of meter readings in autoranging mode.

Question 17

Digital meters for automotive testing should include ________.
A) DC amps up to at least 10A
B) diode tester
C) Both A and B
D) Neither A nor B

Accepted Answer

Automotive testing requires a wide range of measurements, including DC amps up to at least 10A and the ability to test diodes. Therefore, the digital meter should include both options (A and B).

Question 18

With which signal pattern is the RMS reading the same as the average reading?
A) Square wave
B) Nonsymmetric
C) Sine wave
D) None of these

Accepted Answer

The RMS reading of a sine wave is equal to the average reading because the waveform is symmetrical about the zero axis, resulting in the positive and negative values canceling each other out. In contrast, a square wave and nonsymmetric waveform have different RMS and average readings.

Question 19

Which term is used to describe the resolution of a meter?
A) Counts
B) Digits
C) Both A and B
D) Neither A nor B

Accepted Answer

Both terms, counts and digits, are used to describe the resolution of a meter. Counts refer to the number of increments displayed on the meter while digits refer to the number of digits displayed on the meter.

Question 20

When selecting a meter, percentage accuracy ratings that are ________ indicate more precise meters.
A) lower
B) blank
C) neutral
D) higher

Accepted Answer

Lower percentage accuracy ratings indicate that the meter has a smaller margin of error, thus being more precise.

Quiz 3: Circuit Testers and Digital Meters

An ohmmeter should be connected to the circuit or component being tested ________.

When using a test light to probe for electrical power, the alligator clip is connected to ________.

When testing a diode with the multimeter set on "Diode Check" a reading of 0.6 volts is obtained. This indicates that the diode being tested is a(n) ________.

Which is the highest reading?

Which of these is safe for use in circuits with electronic components?

Which device illuminates a different color when connected to power or ground sides of a circuit?

Which device may be useful for testing hall effect sensors?

When using a DMM, the black lead usually goes in which port?

kHz is a unit describing what property?

Ammeters should be connected ________ with the circuit being tested.

To prevent blowing the meter fuse in a DMM ________.

Which type of ammeter can measure current when clamped around a conductor?

The ability to measure AC current is useful when diagnosing ________.

The internal resistance of any meter is only effective if the meter is set on the ________ scales.

When measuring resistance, a reading of OL on the DMM indicates ________.

When interpreting meter readings in autoranging mode ________.

Digital meters for automotive testing should include ________.

With which signal pattern is the RMS reading the same as the average reading?

Which term is used to describe the resolution of a meter?

When selecting a meter, percentage accuracy ratings that are ________ indicate more precise meters.