CDC 3E052D Volume 3. Electrical Test Equipment, Diagrams and Troubleshooting

Question 1

2. (401) A voltmeter is connected to a circuit in

a. series with the power source.
b. parallel with the power source.
c. series with the electrical unit to be tested.
d. parallel with the electrical unit to be tested.

Answer 1

d. parallel with the electrical unit to be tested.

Question 2

3. (401) Ohmmeters are used to check the

a. resistance of a unit or a circuit.
b. potential difference between two points.
c. amount of power that is used by a circuit.
d. amount of electrons that are flowing in a circuit.

Answer 2

a. resistance of a unit or a circuit.

Question 3

4. (401) What must be done before you test a circuit with an ohmmeter?
   a. Disconnect the protective device at the switch.
   b. Isolate the load of the circuit at the power source.
   c. Isolate the part of the circuit that needs to be tested.
   d. Disconnect the power source at the protective device.

Answer 3

c. Isolate the part of the circuit that needs to be tested.

Question 4

5. (401) What are two basic types of multimeters?

a. Analog and digital.
b. Digital and solid start.
c. Analog and electronic.
d. Electronic and solid state.

Answer 4

a. Analog and digital.

Question 5

6. (401) What feature prevents the erroneous application of test leads in a “live” circuit from being dangerous as it once was when using a digital meter?

a. Auto test.
b. Auto ranging.
c. Auto polarity.
d. Auto directional.

Answer 5

c. Auto polarity.

Question 6

7. (401) What auto feature allows rapid measurements over a wide range of resistance, voltage, and current values safely and conveniently on a single setting?

a. Test.
b. Ranging.
c. Polarity.
d. Directional.

Answer 6

b. Ranging.

Question 7

8. (401) What type of meter can you use for current readings without connecting the ammeter in the circuit?

a. Digital multimeter.
b. Analog ohmmeter.
c. Clamp-on ammeter.
d. Shunt style ammeter.

Answer 7

c. Clamp-on ammeter.

Question 8

9. (401) What meter is used for measuring the resistance of insulating material?
   a. Ohmmeter.
   b. Multimeter.
   c. Vibroground.
   d. Megohmmeter.

Answer 8

d. Megohmmeter.

Question 9

10. (401) What device is a quick, convenient tool for determining the overall condition of a battery?

a. Vibroground.
b. Frequency meter.
c. Recording meters.
d. Battery load tester.

Answer 9

d. Battery load tester.

Question 10

11. (402) What type of voltmeter reading indicates that the fuse may be bad and further testing is necessary?

a. A reading of zero.
b. Any reading other than zero.
c. A reading of the applied voltage.
d. Any reading other than the applied voltage.

Answer 10

b. Any reading other than zero.

Question 11

12. (402) One of the more common mistakes made when checking resistance is the failure to
    a. isolate the component being tested.
    b. remove the battery from the circuit.
    c. place the leads in the correct polarity.
    d. install protective devices in the circuit.

Answer 11

a. isolate the component being tested.

Question 12

13. (402) What device can be tested in the same way as a resistor?
    a. Inductors.
    b. Capacitors.
    c. Transistors.
    d. Silicon controlled rectifiers.

Answer 12

a. Inductors.

Question 13

14. (402) How is diode resistance checked when you are using an ohmmeter?
    a. Only at one end.
    b. In both directions.
    c. Only in one direction.
    d. At both ends in one direction.

Answer 13

b. In both directions.

Question 14

15. (402) What is the resistance on a diode with reverse bias applied?
    a. Low voltage drop.
    b. High voltage drop.
    c. Low resistance value.
    d. High resistance value.

Answer 14

d. High resistance value.

Question 15

16. (402) What type of reading on an ohmmeter is an indication of a good diode?
    a. No resistance reading in either direction.
    b. A low resistance reading in both directions.
    c. A high resistance reading in both directions.
    d. A low resistance reading in one direction and high resistance reading in the opposite.

Answer 15

d. A low resistance reading in one direction and high resistance reading in the opposite.

Question 16

17. (403) What are the four basic types of wiring diagrams used in the power production field?
    a. One-line, schematic, connection, and interconnection diagrams.
    b. One-line, schematic, connection, and troubleshooting diagrams.
    c. One-line, connection, troubleshooting, and interconnection diagrams.
    d. Schematic, connection, troubleshooting, and interconnection diagrams.

Answer 16

a. One-line, schematic, connection, and interconnection diagrams.

Question 17

18. (403) Of all the wiring diagrams, which one is by far the most important and most useful for troubleshooting and extracting circuits?

a. One-line.
b. Schematic.
c. Connection.
d. Troubleshooting.

Answer 17

b. Schematic.

Question 18

19. (403) Which diagram shows the connection of an installation or its component devices and equipment?

a. One-line.
b. Schematic.
c. Connection.
d. Interconnection.

Answer 18

c. Connection.

Question 19

20. (403) Which diagram provides complete wire numbers, plug and jack pin numbers, and cannon plug numbers required to completely extract and troubleshoot specific circuits?

a. One-line.
b. Schematic.
c. Connection.
d. Interconnection.

Answer 19

c. Connection.

Question 20

21. (403) What do dot-dash lines mean on an interconnection diagram?
    a. Outline of the generator.
    b. Outline the panel sections.
    c. Sections that work together.
    d. Sections that work independent.

Answer 20

b. Outline the panel sections.

Question 21

22. (404) What device is used to protect a circuit from overload and short circuit conditions?
    a. A circuit breaker.
    b. A quick disconnect.
    c. An overload coupling.
    d. An under voltage relay.

Answer 21

a. A circuit breaker.

Question 22

23. (404) What is indispensable when you troubleshoot the electrical circuitry of equipment?
    a. The ability to test components.
    b. The ability to follow circuit wiring.
    c. The ability to foresee meter readings.
    d. The ability to trace and extract circuits.

Answer 22

d. The ability to trace and extract circuits.

Question 23

24. (404) What task will you often find easier when tracing circuits on a wiring diagram for the purpose of troubleshooting?

a. Reading the technical data about the circuit.
b. Following the circuitry as you trace the diagrams.
c. Test the components as you get to them on the diagram.
d. Extracting the specific circuit in which you are interested.

Answer 23

d. Extracting the specific circuit in which you are interested.

Question 24

25. (404) What position are all switches, contacts, relays, and other electrical devices shown in on wiring diagrams?

a. Open position.
b. Closed position.
c. Energized position.
d. De-energized position.

Answer 24

d. De-energized position.

Question 25

26. (404) Which diagram is the most important of all diagrams because it is your guide through the connection diagram?

a. One-line.
b. Schematic.
c. Connection.
d. Interconnection.

Answer 25

b. Schematic.

Question 26

27. (405) What does the first character in the standard mobile electric power (MEP) wiring code identify?

a. Circuit number.
b. Circuit letter.
c. AC or DC circuit.
d. Progression letter.

Answer 26

c. AC or DC circuit.

Question 27

28. (405) What does the last character in the standard mobile electric power (MEP) wiring code identify?

a. Circuit number.
b. Progression letter.
c. AC or DC circuit.
d. Voltage value of circuit.

Answer 27

b. Progression letter.

Question 28

29. (405) Which of the following is the first rule to circuit extraction?
    a. Trace the circuit.
    b. De-energize the circuit.
    c. Identify all circuit components.
    d. Consult the applicable technical manual.

Answer 28

d. Consult the applicable technical manual.

Question 29

30. (405) What is another name for the speed control unit on the MEP–806B generator?
    a. Load sharing synchronizer.
    b. Electric actuator.
    c. Backplane module.
    d. Electronic governor.

Answer 29

d. Electronic governor.

Question 30

31. (406) What component in the MEP–12 DC circuit prevents the battery-charging alternator (G1) from charging the portable battery start cart assembly?

a. A3 voltage regulator assembly.
b. CR–1 Diode.
c. G2 alternator.
d. K29 alternator relay.

Answer 30

b. CR–1 Diode.

Question 31

32. (406) Which of the following relays must be activated to provide control power to the MEP–12 governor control module (A4)?

a. Run relay (K13).
b. Start relay (K12).
c. Idle start relay (K30).
d. Governor relay (K32).

Answer 31

d. Governor relay (K32).

Question 32

33. (406) Which of the following components protects the MEP–12 starter motors from excessive speed?

a. Auxiliary start relays (K10 and K11).
b. Overrunning clutch assemblies.
c. Shutdown relay (K16).
d. Start relay (K12).

Answer 32

b. Overrunning clutch assemblies.

Question 33

34. (407) What component is responsible for automatic operation of the Onan generator?
    a. Automatic start switch.
    b. Automatic transfer panel.
    c. Automatic voltage regulator.
    d. Automatic load share module.

Answer 33

b. Automatic transfer panel.

Question 34

35. (407) Which of the following relays deactivates the starter motor on an Onan generator when the engine speed reaches 500 RPM?

a. B1.
b. G1.
c. K4.
d. K10.

Answer 34

d. K10.

Question 35

1. (401) What are voltmeters used to check?

a. Resistance of an object.
b. Potential difference between two points.
c. Amount of power that is used by a circuit.
d. Amount of electrons that are flowing in a circuit.

Answer 35

b. Potential difference between two points.