Inductors Questions and Answers

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Q61
What happens when moving expanding lines of force encounter a conductor?
  • A Current increases.
  • B Voltage is induced.
  • C Resistance is reduced.
  • D Power is increased.
Answer: Option B
Q62
Fixed transformers have:
  • A a center-tapped secondary
  • B multiple windings
  • C turns ratios that cannot be changed
  • D a multiple-tapped secondary
Answer: Option C
Q63
Which of the following represents a true equivalent of an inductor?
  • A An inductance in series with a resistance and a capacitance
  • B A capacitance in parallel with the series combination of a resistance and an inductance
  • C An inductance in parallel with the series combination of a resistance and a capacitance
  • D The only quality a real inductor has is inductance.
Answer: Option B
Q64
The time required for one weber of flux to cut a conductor and produce one volt is:
  • A one revolution
  • B one second
  • C one millisecond
  • D four revolutions
Answer: Option B
Q65
A voltage is induced in a transformer secondary winding by the action of the:
  • A secondary magnetic field
  • B primary turns ratio
  • C primary magnetic field
  • D secondary counter emf
Answer: Option C
Q66
What is electromagnetism?
  • A the magnetic field generated around a conductor when a current passes through it
  • B the magnetic field generated in a conductor by an external voltage
  • C the voltage caused by a magnetic field in a conductor
  • D the current generated by an external magnetic field
Answer: Option A
Q67
Counter emf or induced voltage is:
  • 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
Answer: Option C
Q68
What are the properties that determine the inductance of a coil?
  • A Length of wire, number of turns, type of core material, length of core
  • B Number of turns, type of wire, length of core, and cross-sectional area of core
  • C Type of core material, number of turns, cross-sectional area of core, and length of core
  • D Type of core material, type of wire, number of turns, and cross-sectional area of core
Answer: Option C
Q69
An inductor is in series with a voltage source, an open switch, and a resistor. The instant the switch is closed, the inductor acts like
  • A a short
  • B an open
  • C a resistor
  • D a voltage source
Answer: Option B
Q70
What is the phase angle between the source voltage and current, when a 100 mH inductor with a reactance of 6 komega.gif, and a 1 komega.gif resistor are in series with a source?
  • A 0.1 degrees
  • B 9.0 degrees
  • C 61.0 degrees
  • D 81.0 degrees
Answer: Option D

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