Inductors 2
1. The primary winding of a transformer is the side connected to the load.
A. True
B. False
Answer: Option B
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2. An air-core inductor has a metal core.
A. True
B. False
Answer: Option B
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3. The time constant of an inductive circuit is dependent on the circuit's resistance.
A. True
B. False
Answer: Option A
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4. The amount of dc current that an inductor will allow to pass depends on the circuit's total
resistance that is in series with it.
A. True
B. False
Answer: Option A
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5. An inductor will boost current flow.
A. True
B. False
Answer: Option B
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6. A step-up transformer will have a turns ratio greater than 1.
A. True
B. False
Answer: Option A
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7. The secondary current in a transformer depends on the secondary voltage and load resistance
values.
A. True
B. False
Answer: Option A
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8. Kirchhoff's voltage law does not apply to series RL circuits.
A. True
B. False
Answer: Option B
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9. Magnetic force is the force that produces a magnetic field.
A. True
B. False
Answer: Option A
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10. A magnet consisting of a coil of wire wound around a soft iron or steel core is called an
electromagnet.
A. True
B. False
Answer: Option A
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11. An ideal inductor would not dissipate any energy.
A. True
B. False
Answer: Option A
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12. Five time constants are required for current in an inductor to reach a maximum value.
A. True
B. False
Answer: Option A
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13. The quality factor of an inductor is the ratio of inductive reactance to the winding resistance of
the coil.
A. True
B. False
Answer: Option A
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14. In a dc circuit, the only conversion of energy to heat is in the inductance of the coil itself.
A. True
B. False
Answer: Option B
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15. Inductance is proportional to the cross-sectional area of a coil.
A. True
B. False
Answer: Option A
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16. XL = 2 fL
A. True
B. False
Answer: Option A
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17. The primary and secondary are in phase.
A. True
B. False
Answer: Option B
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18. Lenz's law states that the current induced in a circuit due to a change in the magnetic field is so
directed as to oppose the change in flux or to exert a mechanical force opposing the motion.
A. True
B. False
Answer: Option A
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19. The output of the secondary winding is 15 V.
A. True
B. False
Answer: Option A
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20. For inductions in series, LT = L1 + L2 + L3 +...
A. True
B. False
Answer: Option A
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21. Maximum power will transfer across a transformer when the primary impedance equals the
secondary impedance.
A. True
B. False
Answer: Option A
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22. Increasing the inductance value in an ac inductive circuit will lower the circuit current.
A. True
B. False
Answer: Option A
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23. A magnetic field results whenever a current flows through a conductor.
A. True
B. False
Answer: Option A
Explanation:
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24.
All the schematic symbols shown in the given figure are variable inductors.
A. True
B. False
Answer: Option B
Explanation:
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25. Self-inductance is the property that causes an electromotive force to be produced in a
conductor.
A. True
B. False
Answer: Option B
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26.
The total inductance in the given circuit is 0.6 mH.
A. True
B. False
Answer: Option A
Explanation:
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27. Inductors connected in series will increase the total inductance value.
A. True
B. False
Answer: Option A
Explanation:
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28. Inductors are not as versatile as capacitors.
A. True
B. False
Answer: Option A
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29. An ac generator will produce a constant waveform.
A. True
B. False
Answer: Option B
Explanation:
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30. The current through an inductor in a parallel RL circuit leads the current through the resistor.
A. True
B. False
Answer: Option A
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31. An RL filter could be a high-pass or a low-pass filter.
A. True
B. False
Answer: Option A
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32. Faraday's law states that the polarity of induced voltage in a coil is in opposition to the current
change through that coil.
A. True
B. False
Answer: Option B
Explanation:
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33. A transformer can be designed to step up or step down dc voltage.
A. True
B. False
Answer: Option B
Explanation:
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1. After a voltage has been applied to an inductor, the current will be ___ of its full value after 2
time constants.
A. 63%
B. 86%
C. 95%
D. 98%
Answer: Option B
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2. The ___ of a coil is the inherent resistance of the wire.
A. ac resistance
B. reactance
C. winding resistance
D. permeability
Answer: Option C
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3.
The inductive reactance of L2 is _____ in the given circuit.
A. 3.5 k
B. 4.4 k
C. 16.3 k
D. 23.3 k
Answer: Option B
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4. ___ power represents the energy dissipated at a given point in time.
A. True
B. Reactive
C. Real
D. Instantaneous
Answer: Option D
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5. After the first time constant, a transient current has changed by _______________ %, leaving
_______________ % remaining.
A. 63.2, 36.8
B. 36.8, 63.2
C. 13.5, 86.5
D. 86.5, 13.5
Answer: Option A
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6.
The total inductive reactance is ___ in the given circuit.
A. 3.5 k
B. 4.4 k
C. 16.3 k
D. 23.3 k
Answer: Option D
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7.
The inductance value of L3 in the given figure is _____ if the total inductance is 340 mH.
A. 150 mH
B. 220 mH
C. 295 mH
D. 315 mH
Answer: Option A
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8. When current flow tries to decrease in an inductor, the magnetic field _______________ and the
voltage polarity across the inductor _______________.
A. collapses, remains the same
B. expands, reverses
C. collapses, reverses
D. expands, remains the same
Answer: Option C
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9. Electromagnetic induction is the generation of _________ from __________.
A. magnetism, electricity
B. electricity, electricity
C. electricity, magnetism
D. magnetism, magnetism
Answer: Option C
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10. Inductive ___ represents the opposition to an alternating current.
A. impedance
B. resistance
C. reluctance
D. reactance
Answer: Option D
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11. The ___ cannot change instantaneously in an inductor.
A. voltage
B. current
C. power
D. magnetic field
Answer: Option B
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12. The opposition to ac by an inductor is directly proportional to ___.
A. resistance
B. reactance
C. frequency
D. voltage
Answer: Option C
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13. An RL integrator can act as a __________ filter and an RC differentiator can act as a
__________ filter.
A. high-pass, high-pass
B. low-pass, low-pass
C. high-pass, low pass
D. low-pass, high-pass
Answer: Option D
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