# Block 3 UNIT I LESSON 3 Basic DC Circuits SERIES CIRCUIT ...

Electronics - Devices

Oct 7, 2013 (4 years and 7 months ago)

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Block 3 UNIT I LESSON 3
Basic DC Circuits SERIES CIRCUIT TROUBLESHOOTING

3-3-23
TEST

Read each of the following questions carefully. Write the letter(s) for the correct answer
in the blank provided.

NOTE:

Answer questions 3 through 10 based on
the circuit values given for the series circuit
of Figure 11.

Figure 11.Series Circuit for Test Questions
3 through 10
1.When troubleshooting a defective circuit, follow the logical sequence of
the four steps of troubleshooting. In what order would you list the
steps below so that they fit into the logical sequence of the four
troubleshooting steps?

a.Compare calculated circuit values and basic measured values to
decide if a circuit is faulty.
b.Make further tests and measurements to determine the fault.
c.Double check your results to verify that you have found the correct
solution to the circuit problem.

2.What do you do when you think you have found the defective
component in a defective circuit you are troubleshooting?

a.Call the instructor.
b.Replace the defective component.
component included in the circuit.
d.Start troubleshooting over again to check your findings.

3.What seems to be the problem with the circuit if your measured value
for current I is 1 mA?

a.Resistor R2 is partially shorted.
b.Resistor R1 is shorted.
c.Resistor R3 is partially shorted.
d.Nothing is wrong.
LESSON 3 UNIT I Block 3
SERIES CIRCUIT TROUBLESHOOTING Basic DC Circuits

3-3-24
4.What seems to be the problem with the circuit if your measured value
for current I is 1.5 mA?

a.Resistor R2 is shorted.c.Resistor R5 is shorted.
b.Resistor R3 is shorted.d.Nothing is wrong.
5.You measure the voltage drops across each resistor in the circuit and
find that E
R1
=4 V, E
R2
=8 V, E
R3
=0 V, and E
R4
=0 V. What seems to
be the problem?

a.Resistor R3 is shorted.
b.Resistor R4 is shorted.
c.Terminals TP3 and TP5 are shorted.
d.Nothing is wrong.
6.You measure the current and find that I=0 A. You then measure the
voltage across R4 and find that E
R4
=12 V. What seems to be the
problem?

a.Resistor R1 is open.c.Resistor R3 is open.
b.Resistor R2 is open.d.Resistor R4 is open.
7.When you measure all voltage drops, you find that E
R1
=1.2 V,
E
R2
=2.4 V, E
R3
=2.4 V and E
R4
=6 V. What seems to be the problem?

a.Resistor R1 increased in value.
b.Resistor R2 increased in value.
c.Resistor R3 decreased in value.
d.Resistor R4 decreased in value.

8.You measure the voltages across the test points. What seems to be the
problem if the values you read are:

TP1 to TP5 = 12 V TP2 to TP5 = 12 V
TP3 to TP5 = 12 V TP4 to TP5 = 0 V
a.Resistor R1 is shorted.c.Resistor R3 is open.
b.Resistor R2 is open.d.Resistor R4 is shorted.

9.You measure the voltage from TP3 to TP5 and get a reading of 7.5 V.
What seems to be the problem?

a.Resistor R1 is shorted.c.Resistor R3 is shorted.
b.Resistor R2 is shorted.d.None of the above.

10.You measure the current and find that I=2 mA. Which test points do
you suspect are shorted?

a.TP1 to TP4 c.TP2 to TP3
b.TP3 to TP5 d.TP2 to TP4