Motor Control 3: Lesson 9 - Troubleshooting Electrical Systems

Question 1

Troubleshooting techniques are proven procedures that provide a structure for the troubleshooting process.

True or False

Answer 1

True

Question 2

Which troubleshooting technique or logical tool is a set of rectangles used to identify the parts of a system?

a. Block diagrams
b. Bracketing
c. Information funneling
d. Signal flow
e. Signal flow analysis

Answer 2

a. Block diagrams

Question 3

Which troubleshooting technique uses external markers to identify the portion of the block diagram in which the fault exists?

a. Bracketing
b. Information funneling
c. Signal flow
d. Signal flow analysis

Answer 3

a. Bracketing

Question 4

Which troubleshooting technique is generally divided into two groups called power and information?

a. Block diagrams
b. Bracketing
c. Information funneling
d. Signal flow

Answer 4

d. Signal flow

Question 5

Which basic troubleshooting technique includes four levels of testing?

a. Block diagrams
b. Bracketing
c. Information funneling
d. Signal flow

Answer 5

c. Information funneling

Question 6

What kind of signal flow topology path is represented by Connections 1 and 2 and shows power feeds to the main switchgear block?

a. Convergent
b. Divergent
c. Feedback
d. Linear
e. Switched path

Answer 6

a. Convergent

Question 7

What kind of signal flow topology are paths 3 and 8?

a. Convergent
b. Divergent
c. Feedback
d. Linear
e. Switched path

Answer 7

c. Feedback

Question 8

The three paths labelled 4 represent what kind of signal flow topology?

a. Convergent
b. Divergent
c. Feedback
d. Linear
e. Switched path

Answer 8

b. Divergent

Question 9

The paths labelled 5 and 6 represent what kind of signal flow topology?

a. Convergent
b. Divergent
c. Feedback
d. Linear
e. Switched path

Answer 9

d. Linear

Question 10

Lines 7 and 9 represent two different sources converging into the data equipment block.

True or False

Answer 10

True

Question 11

Which signal flow topology could include linear, divergent, or convergent paths and contains switches that can change the flow of the signal?

a. Convergent
b. Divergent
c. Feedback
d. Linear
e. Switched path

Answer 11

e. Switched path

Question 12

A customer reports a problem with the system shown in the system diagram. The report indicates that there is a problem with a loss of power. However, the feedback to the emergency power generator indicates that utility-supplied power is present. When a test was performed, the emergency power generator assumed the load with no faults. Based upon this new information, which set of brackets show the new area of the drawing that requires further inspection?

a. Bracket #1
b. Bracket #2
c. Bracket #3
d. None of the above

Answer 12

b. Bracket #2

Note: According to Convergent Rule Two, both the utility supplied power, and the emergency generator can be eliminated as the problem. The left bracket would move to the right, eliminating those two blocks from the scope of the analysis.

Question 13

A customer reports a problem with the system shown in the system diagram. The report indicates that there is a problem with a loss of power. However, the feedback to the emergency power generator indicates that utility-supplied power is present. Further tests on the system show that there is no power outage to the manufacturing and assembly block, or to the data equipment block. Based upon this new information, which set of brackets show the new area of the drawing that requires further inspection?

a. Bracket #1
b. Bracket #2
c. Bracket #3
d. None of the above

Answer 13

c. Bracket #3

Note: The power diverges from the main switch gear to three other subsystems. Since two of the three subsystems are functional, the new focus is on the lighting and branch circuit distribution panel and the branch lighting and power circuits. The divergent rule states that when brackets enclose system blocks with a divergent path, the stage before the divergence is fault-free if any of the divergent paths are normal.

Question 14

Based upon the new information, where should the next test point be?

a. Branch lighting and power
b. Lighting and branch circuit distribution panel

Answer 14

b. Lighting and branch circuit distribution panel

Note: The lighting and branch circuit distribution panel and the branch lighting and power have a linear relationship in the diagram. The Linear Rule states that when brackets enclose a linear set of system blocks, the first test point should be located at or just before the midpoint of the bracketed area. Testing should be completed on the lighting and branch circuit distribution panel, to eliminate this block as the problem or to identify a problem within this block.

Question 15

When applying the ______ technique and when brackets are widely separated on the system where the problem is present, tests selected for identifying the fault tend to be more general in nature.

a. Block diagrams
b. Bracketing
c. Information funneling
d. Signal flow
e. Signal flow analysis

Answer 15

c. Information funneling

Question 16

At which step in a funneling analysis troubleshooting procedure are tests generally limited to a single unit in the system block diagram?

a. Level 1
b. Level 2
c. Level 3
d. Level 4

Answer 16

c. Level 3

Question 17

By bracketing and funneling analysis procedures, pointless and irrelevant system tests are avoided, redundant system tests are eliminated, and tests are not performed prematurely, eliminating wasted effort on tests which do not produce usable results.

True or False

Answer 17

True

Question 18

To better understand the abnormal operation of a system, it is essential that one first understand the normal operation.

True or False

Answer 18

True

Question 19

Place the six steps used when troubleshooting a system in the correct sequence.

Answer 19

Question 20

The first ______ steps in the troubleshooting sequence are repeated as often as necessary until the fault is located.

a. 2
b. 3
c. 4
d. 5

Answer 20

b. 3