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‣
Electronics
‣
Inductors
Comments
Question
A winding of wire can be called
Options
A. an inductor
B. a coil
C. a choke
D. All of the above
Correct Answer
All of the above
Inductors problems
Search Results
1. A utility pole transformer used to supply a residential customer with two phases uses:
Options
A. two phases on the primary
B. a center tap on the secondary
C. a separate ground for each phase
D. a small coefficient of coupling
Show Answer
Scratch Pad
Discuss
Correct Answer: a center tap on the secondary
2. Which two values are plotted on a B-H curve graph?
Options
A. reluctance and flux density
B. permeability and reluctance
C. magnetizing force and permeability
D. flux density and magnetizing force
Show Answer
Scratch Pad
Discuss
Correct Answer: flux density and magnetizing force
3. Find I
R
and I
L
.
Options
A. I
R
= 50 mA, I
L
= 109 mA
B. I
R
= 150 mA, I
L
= 9 mA
C. I
R
= 50 mA, I
L
= 151 mA
D. I
R
= 150 mA, I
L
= 53 mA
Show Answer
Scratch Pad
Discuss
Correct Answer: I
R
= 150 mA, I
L
= 53 mA
4. What happens when moving expanding lines of force encounter a conductor?
Options
A. Current increases.
B. Voltage is induced.
C. Resistance is reduced.
D. Power is increased.
Show Answer
Scratch Pad
Discuss
Correct Answer: Voltage is induced.
5. If 360 V
ac
is the output of a 300-turn secondary winding, what is the input voltage when the primary winding has 150 turns?
Options
A. 2.4 V
ac
B. 150 V
ac
C. 180 V
ac
D. 720 V
ac
Show Answer
Scratch Pad
Discuss
Correct Answer: 180 V
ac
6. Counter emf or induced voltage is:
Options
A. inversely proportional to the change in current
B. directly proportional to the change in time
C. directly proportional to the inductance in henrys
D. inversely proportional to the inductance in henrys
Show Answer
Scratch Pad
Discuss
Correct Answer: directly proportional to the inductance in henrys
7. What is the phase angle between the source voltage and current, when a 100 mH inductor with a reactance of 6 kΩ, and a 1 kΩ resistor are in series with a source?
Options
A. 0.1 degrees
B. 9.0 degrees
C. 61.0 degrees
D. 81.0 degrees
Show Answer
Scratch Pad
Discuss
Correct Answer: 81.0 degrees
8. In a purely inductive circuit,
Options
A. current leads voltage by 90°
B. voltage lags current by 90°
C. voltage leads current by 90°
D. voltage and current are in phase (0°)
Show Answer
Scratch Pad
Discuss
Correct Answer: voltage leads current by 90°
9. How long until the current is at a maximum?
Options
A. 0 µs
B. 5 µs
C. 15 µs
D. 25 µs
Show Answer
Scratch Pad
Discuss
Correct Answer: 5 µs
10. In a transformer, what will happen to the primary current if the secondary magnetic field increases?
Options
A. I
p
will increase.
B. I
p
will be canceled.
C. I
p
will remain the same.
D. I
p
will decrease.
Show Answer
Scratch Pad
Discuss
Correct Answer: I
p
will increase.
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