Deck 42: Troubleshooting

Question 1

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

Answer 1

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

Question 2

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

Answer 2

overloaded

Question 3

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

Answer 3

If the overload relay is a thermal type, a source of heat is the likely cause of the problem.

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

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

Question 6

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

Question 7

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

Question 8

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 9

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

Question 10

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

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

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

Question 13

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

Question 14

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

Question 15

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