Inductors Questions and Answers

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Q21
Electromagnetic induction is the generation of:
  • A electricity from magnetism
  • B electricity from electricity
  • C magnetism from electricity
  • D magnetism from magnetism
Answer: Option A
Q22
Inductance is:
  • A directly proportional to the length of the coil
  • B directly proportional to the number of turns on the coil
  • C inversely proportional to the cross-sectional area of the coil
  • D inversely proportional to the permeability
Answer: Option B
Q23
Current will cause a magnetic field in a conductor as follows:
  • A An ac current causes a fixed polarity magnetic field.
  • B A dc current causes a fixed polarity magnetic field.
  • C A dc current causes an alternating magnetic field.
  • D An ac current causes a fixed polarity magnetic field and a dc current causes an alternating magnetic field.
Answer: Option B
Q24
During a current change, the ability of a conductor to produce counter emf within itself is called:
  • A back emf
  • B self-induction
  • C a henry
  • D impedance
Answer: Option B
Q25
When a transformer secondary lead has been connected to a middle loop that is not an end connector, it is called a:
  • A multiple-tapped secondary
  • B center-tapped secondary
  • C multiple winding secondary
  • D single winding secondary
Answer: Option B
Q26
What will happen when an inductor's magnetic field collapses?
  • A Current will double.
  • B Voltage will be induced.
  • C A new field will expand.
  • D Counter emf will be high.
Answer: Option B
Q27
With a square wave input, an RL differentiator circuit with an output across the inductor will produce what type of waveform?
  • A dc
  • B short time-duration pulses
  • C exponential-shaped pulses
  • D only a phase shift
Answer: Option B
Q28
When a magnet enters a coil and a voltage is induced, the process is known as:
  • A an alternation
  • B self-inductance
  • C counter emf
  • D flux linkage
Answer: Option D
Q29
What term is used to describe the action of magnetic flux from one circuit that cuts across the conductors of another circuit?
  • A self-inductance
  • B rectification
  • C mutual inductance
  • D magnetism
Answer: Option C
Q30
Reactance in an inductive circuit will:
  • A increase with frequency
  • B decrease with frequency
  • C be independent from frequency
  • D depend on the value of XC
Answer: Option A

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