Inductors Questions and Answers

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Q11
What does Faraday's law concern?
  • A a magnetic field in a coil
  • B a magnetic field cutting a conductor
  • C a magnetic field hystersis
  • D a magnetic field in a conductor
Answer: Option B
Q12
The polarity of induced voltage while a field is collapsing is:
  • A independent of the force creating it
  • B opposite to the force creating it
  • C identical to the force creating the field
  • D present only if the force is stationary
Answer: Option B
Q13
What is the permeability of transformer iron?
  • A 50
  • B 450
  • C 1,500
  • D 5,500
Answer: Option D
Q14
Electromagnetism is the:
  • A magnetic field caused by a permanent magnet
  • B action between a permanent and an artificial magnet
  • C magnetic field action with a current-carrying wire
  • D current in the coil
Answer: Option C
Q15
A magnetic field has:
  • A polar fields
  • B lines of force
  • C magnetomotive force
  • D lines of reluctance
Answer: Option B
Q16
Which two values are plotted on a B-H curve graph?
  • A reluctance and flux density
  • B permeability and reluctance
  • C magnetizing force and permeability
  • D flux density and magnetizing force
Answer: Option D
Q17
What is the number of turns required in the secondary winding for a transformer when 120 volts is applied to a 2400-turn primary to produce 7.5 Vac at the secondary?
  • A 75 turns
  • B 150 turns
  • C 900 turns
  • D 1920 turns
Answer: Option B
Q18
The four factors determining inductance are the number of turns, coil length, coil area, and:
  • A permeability
  • B reluctance
  • C counter emf
  • D coefficient of coupling
Answer: Option A
Q19
The time difference, or lag, between flux density and magnetizing force is known as:
  • A eddy current
  • B magnetic saturation
  • C hysteresis
  • D coercivity
Answer: Option C
Q20
A magnetic circuit breaker will open to protect equipment only when:
  • A voltage is exceeded
  • B an open is in the equipment
  • C the equipment is operating properly
  • D current is exceeded
Answer: Option D

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