Inductors Questions and Answers

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Q1
The electrical energy consumed by a coil is stored in the form of:
  • A an electrical field
  • B a force field
  • C an electrostatic field
  • D a magnetic field
Answer: Option D
Q2
What is magnetic flux?
  • A the number of lines of force in webers
  • B the number of lines of force in maxwells
  • C the number of lines of force in teslas
  • D the number of lines of force in flux density
Answer: Option A
Q3
As current travels within a conductor:
  • A the magnetic field aids the current
  • B a magnetic field is developed around it
  • C the wire tries to point north
  • D an electrostatic field opposes the current
Answer: Option B
Q4
What type of device consists of a coil with a moveable iron core?
  • A solenoid
  • B reed switch
  • C relay
  • D armature
Answer: Option A
Q5
What is hysteresis?
  • A lead between cause and effect
  • B lag between cause and effect
  • C lead between voltage and current
  • D lag between voltage and current
Answer: Option B
Q6
In a purely inductive circuit,
  • 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°)
Answer: Option C
Q7
A series RL filter circuit with an output across the inductor will result in what type of filtering?
  • A passing of the higher frequencies
  • B passing of the lower frequencies
  • C blocking of the higher frequencies
  • D blocking of a certain range of frequencies
Answer: Option A
Q8
On a schematic, dashed lines between two vertical coils usually mean the transformer has:
  • A an air core
  • B an iron core
  • C a nonmetallic core
  • D a ferrite core
Answer: Option D
Q9
Faraday's law states that the:
  • A direction of the induced voltage produces an opposition
  • B direction of an induced current produces an aiding effect
  • C emf depends on the rate of cutting flux
  • D emf is related to the direction of the current
Answer: Option C
Q10
A henry value divided by a circuit resistive value provides the:
  • A counter emf value
  • B induced voltage amplitude
  • C rise or decay time constant
  • D quality factor of the coil
Answer: Option B

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