Deck 42: Troubleshooting

Question 1

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

Answer 1

True

Question 2

Figure 42-15
What is indicated by the ammeter readings shown in the accompanying figure?

Answer 2

Ammeter readings indicate that the motor has a shorted winding.

Question 3

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

Answer 3

False

Question 4

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

Question 5

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 6

The ____________________ indicates the amount of potential between two points.

Question 7

Figure 42-14
Ammeter readings in the accompanying figure indicate that the motor is ____________________.

Question 8

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

Question 9

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

Question 10

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

Question 11

It is possible to troubleshoot a circuit without a working knowledge of schematics.

Question 12

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

Question 13

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 14

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

Question 15

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