Meter Usage And Circuit Diagnosis
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
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