Deck 42: Troubleshooting

Question 1

Plunger type voltage testers can be used to test control systems that operate on low voltage, such as 24 volt systems.

Answer 1

False

Question 2

Why do some electricians prefer to use a plunger type voltage tester?

Answer 2

Some electricians prefer to use a plunger type voltage tester because these testers are not susceptible to ghost voltages.

Question 3

What are the three main instruments that an electrician uses to troubleshoot a circuit?

Answer 3

The three main instruments an electrician uses to troubleshoot a circuit are the voltmeter, ohmmeter, and ammeter.

Question 4

Overload relays are intended to disconnect the motor from the power line in the event that the current draw becomes excessive.

Question 5

One of the basic rules for series circuits is that the voltage drop across all circuit components must equal the applied ____________________.

Question 6

Figure 42-16
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What is indicated by the ammeter readings shown in the accompanying figure?

Question 7

____________________ are often used to check motor windings. These meters measure resistance in millions of ohms and are generally employed to test insulation resistance.

Question 8

If an overload relay that is a thermal type has tripped several times, what is the likely cause of the problem?

Question 9

When using an ohmmeter, make certain that the power is connected to the circuit.

Question 10

The amount of voltage drop across each component in a series circuit is proportional to the resistance of the components and the amount of ____________________ flow.

Question 11

When deenergizing or energizing a control cabinet or motor control center module, the electrician should be dressed in flame retardant clothing while wearing safety glasses, a face shield, and hard hat.

Question 12

What is the advantage that clamp-on type ammeters have?

Question 13

Figure 42-15
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Ammeter readings in the accompanying figure indicate that the motor is ____________________.

Question 14

The voltmeter and ohmmeter are generally contained in the same meter. These meters are called ____________________.

Question 15

Megohmmeters can develop voltages that range from 250 to 500,000 volts depending on the model of the meter and the range setting.