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AC Theory Level 2 Lesson 1
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AC Theory Level 2 Lesson 1 Practice Questions and Answers
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1. what is the formula for resisters in parallel 1/ (1/R1 + 1/R2 + 1/R3)
2. what is the formula for resistors in series R1 + R2 +R3
3. what is the formula for inductors in series L1 + L2 + L3
4. what is the formula for inductive reactance XL = 2πfL
5. Refer to the formula XL = 2πfL. If L increases, XL ? , and d. increases / increases
if f increases, XL ? .
a. decreases / decreases
b. decreases / increases
c. increases / decreases
d. increases / increases
6. Coils do not have resistance. false
Select one:
True
False
7. The ratio of a coil's inductive reactance to resistance d. quality factor / Q
XL/R is referred to as the coil's ? whose symbol is ? .
a. impedance factor / Z
b. power factor / P
c. reactance factor / X
d. quality factor / Q
8. In a circuit containing only inductance (if this is possi- a. 90° out-of-phase, lag-
ble), what is the phase relationship between the cur- ging
rent and the applied voltage?
a. 90° out-of-phase, lagging
b. 90° out-of-phase, leading
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AC Theory Level 2 Lesson 1 Practice Questions and Answers
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c. 180° out-of-phase, lagging
d. 180° out-of-phase, leading
9. If a circuit contains ? , the current and the applied b. only resistance
voltage will always be in-phase.
a. only inductance
b. only resistance
c. both inductance and resistance
d. no resistance
10. What is meant by the statement that the circuit is a RL a. The circuit contains in-
circuit? ductive reactance and re-
a. The circuit contains inductive reactance and resis- sistance
tance
b. The circuit is a combination circuit.
c. The circuit is purely inductive
d. The circuit is purely resistive
11. Inductive reactance of a circuit is directly proportional b. II. and III.
to ? .
I. current
II. frequency
III. inductance
IV. resistance
V. voltage
a. I. and II.
b. II. and III.
c. IV. and II.
d. IV. and V.
e. I., II., and III.
f. I., IV., and V.
2/6
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AC Theory Level 2 Lesson 1 Practice Questions and Answers
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12. Both resistance and inductive reactance oppose cur- b. impedance
rent flow, and their combined opposition is called ? .
a. counter electromotive force
b. impedance
c. reluctance
d. skin effect
13. 1. Inductive reactance is measured in ? and is designat- 1. ohms XL
ed by ? . 2. ohms Z
2. Impedance is measured in ? and is designated by ? . 3. ohms R
3. Resistance is measured in ? and is designated by ? .
14. To find the total impedance for a series RL circuit, True
vector addition must be used.
Select one:
True
False
15. Using the impedance triangle is just one method of true
graphically showing how out-of-phase quantities can
be added.
Select one:
True
False
16. One of the primary laws for series circuits is that the ? a. current
must be the same in any part of the circuit.
a. current
b. reactance
c. resistance
d. voltage
17.
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AC Theory Level 2 Lesson 1 Practice Questions and Answers
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AC Theory Level 2 Lesson 1
Practice Questions and
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AC Theory Level 2 Lesson 1 Practice Questions and Answers
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1. what is the formula for resisters in parallel 1/ (1/R1 + 1/R2 + 1/R3)
2. what is the formula for resistors in series R1 + R2 +R3
3. what is the formula for inductors in series L1 + L2 + L3
4. what is the formula for inductive reactance XL = 2πfL
5. Refer to the formula XL = 2πfL. If L increases, XL ? , and d. increases / increases
if f increases, XL ? .
a. decreases / decreases
b. decreases / increases
c. increases / decreases
d. increases / increases
6. Coils do not have resistance. false
Select one:
True
False
7. The ratio of a coil's inductive reactance to resistance d. quality factor / Q
XL/R is referred to as the coil's ? whose symbol is ? .
a. impedance factor / Z
b. power factor / P
c. reactance factor / X
d. quality factor / Q
8. In a circuit containing only inductance (if this is possi- a. 90° out-of-phase, lag-
ble), what is the phase relationship between the cur- ging
rent and the applied voltage?
a. 90° out-of-phase, lagging
b. 90° out-of-phase, leading
1/6
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AC Theory Level 2 Lesson 1 Practice Questions and Answers
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c. 180° out-of-phase, lagging
d. 180° out-of-phase, leading
9. If a circuit contains ? , the current and the applied b. only resistance
voltage will always be in-phase.
a. only inductance
b. only resistance
c. both inductance and resistance
d. no resistance
10. What is meant by the statement that the circuit is a RL a. The circuit contains in-
circuit? ductive reactance and re-
a. The circuit contains inductive reactance and resis- sistance
tance
b. The circuit is a combination circuit.
c. The circuit is purely inductive
d. The circuit is purely resistive
11. Inductive reactance of a circuit is directly proportional b. II. and III.
to ? .
I. current
II. frequency
III. inductance
IV. resistance
V. voltage
a. I. and II.
b. II. and III.
c. IV. and II.
d. IV. and V.
e. I., II., and III.
f. I., IV., and V.
2/6
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AC Theory Level 2 Lesson 1 Practice Questions and Answers
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12. Both resistance and inductive reactance oppose cur- b. impedance
rent flow, and their combined opposition is called ? .
a. counter electromotive force
b. impedance
c. reluctance
d. skin effect
13. 1. Inductive reactance is measured in ? and is designat- 1. ohms XL
ed by ? . 2. ohms Z
2. Impedance is measured in ? and is designated by ? . 3. ohms R
3. Resistance is measured in ? and is designated by ? .
14. To find the total impedance for a series RL circuit, True
vector addition must be used.
Select one:
True
False
15. Using the impedance triangle is just one method of true
graphically showing how out-of-phase quantities can
be added.
Select one:
True
False
16. One of the primary laws for series circuits is that the ? a. current
must be the same in any part of the circuit.
a. current
b. reactance
c. resistance
d. voltage
17.
3/6
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AC Theory Level 2 Lesson 1 Practice Questions and Answers
