# Meter Usage And Circuit Diagnosis

25 Questions | Total Attempts: 6659  Settings  Chapter 37

• 1.
What materials make a good insulator?
• A.

Copper and aluminum

• B.

Ceramic and plastic

• C.

Both A and B

• D.

None of the above

• 2.
Tech A says AC stands for alternating voltage. Tech B says DC is used in electric motors on most hybrid vehicles. Who is correct?
• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

• 3.
Tech A says high resistance causes an increase in current flow. Tech B says a voltage drop is another name for high resistance. Who is correct?
• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

• 4.
Tech A says parallel circuits are like links in a chain. Tech B says total current in a parallel circuit equals the sum of the current flowing in each branch of the circuit. Who is correct?
• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

• 5.
Tech A says relays are turned on and off by a small amount of current. Tech B says there are two types of relays: normally closed (NC) and normally open (NO) types. Who is correct?
• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

• 6.
What does DVOM stand for?
• A.

Digital volt–hour meter

• B.

Digital volt-ohmmeter

• C.

Digital valve ohmmeter

• D.

Digital variable oval meter

• 7.
When reading a digital volt-ohmmeter (DVOM), you have a reading of 2168 mV, which is the same as:
• A.

2168 millivolts.

• B.

2.168 volts.

• C.

1000 mV.

• D.

Both A and B

• 8.
When probing wires, you should do all these EXCEPT:
• A.

Back probe when possible.

• B.

Use caution when piercing wiring not to damage the wire internally.

• C.

Reinsulate the hole with room temperature vulcanizing silicone.

• D.

Never use excessive force.

• 9.
Tech A says you can measure up to 100 amps directly through the meter. Tech B says when checking high volts, you need to use a volt clamp so you don't damage the digital volt-ohmmeter (DVOM). Who is correct?
• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

• 10.
Tech A says most digital volt-ohmmeters (DVOMs) have both auto range and a manual range setting. Tech B says OL means overload and indicates the voltage being read is higher than the maximum. Who is correct?
• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

• 11.
When doing a voltage drop test, the reading is 2.7 volts across the circuit. How many volts are going to the load?
• A.

12 volts

• B.

9.3 volts

• C.

8.3 volts

• D.

3.7 volts

• 12.
Tech A says testing across the battery will show you better voltage. Tech B says when checking across a switch, it has a 2-volt drop, which means only about 10 volts are going to the light. Who is correct?
• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

• 13.
Tech A says when doing a voltage drop test, the voltmeter needs to be set to ohm. Tech B says current has to be flowing to do a voltage drop test. Who is correct?
• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

• 14.
Tech A says that in a relay, current is sent through a resistor and a magnetic field is produced. Tech B says to check the amps in a circuit, you need to connect the leads parallel to the circuit. Who is correct?
• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

• 15.
Tech A says when checking resistance in a circuit, you need to have power connected to the component. Tech B says ideally, you should have a component disconnected. Who is correct?
• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

• 16.
Tech A says Ohm's law will show how many amps are needed in a circuit with 110 ohm resistor and a 12-volt power supply. The amps needed are:
• A.

12 amps.

• B.

1.2 amps.

• C.

0.12 amps.

• D.

0.012 amps.

• 17.
Tech A says there are three ways to check a circuit with Ohm's law. Tech B says if you know two of the measurements, Ohm's law will show you the third. Who is correct?
• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

• 18.
When discussing a circuit, you know the voltage is 0.202 volts and the current draw is 0.00202 amp. What is the resistance in the circuit?
• A.

1

• B.

10

• C.

100

• D.

10000

• 19.
When doing a voltage drop test, you should do all these EXCEPT:
• A.

Select auto range volts DC.

• B.

Connect the red lead to volt/ohm.

• C.

Remove the positive battery cable.

• D.

Ensure the current is flowing.

• 20.
Tech A says you can calculate total circuit current with this formula I = V ÷ R. Tech B says you can determine the total voltage drop using Ohm's law. Who is correct?
• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

• 21.
Tech A says voltage drops can be measured as long as current is flowing. Tech B says voltage drops can be measured across components, connectors, or cables. Who is correct?
• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

• 22.
When calculating current flow in a parallel circuit that has 4 resistors, you would:
• A.

Divide the total current flow by the volts.

• B.

Multiply the current flow by 4.

• C.

Add the current flow for each resistor together.

• D.

Subtract the volts from amps and add 2 volts.

• 23.
A variable resistor:
• A.

Has a fixed resistance.

• B.

Changes with the amount of voltage applied.

• C.

Has a movable arm that swipes across a coil that has less resistance at one end and more at the other.

• D.

All of the above

• 24.
Tech A says checking a variable resistor is almost the same as a regular resistor. Tech B says you have to have a different type of digital volt-ohmmeter (DVOM) to read a variable resistor. Who is correct?
• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

• 25.
Tech A says an oscilloscope is commonly referred to as a lab scope or just scope. Tech B says lab scopes are not very important test instruments in a modern automobile. Who is correct?
• A.

Tech A

• B.

Tech B

• C.

Both Techs A and B

• D.

Neither Tech A nor B

Related Topics Back to top