Magnetism and Electrom Questions and Answers

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Showing 10 of 33 questions
Q11
Which electromagnetic device has a flexible cone?
  • A A speaker
  • B A dc generator
  • C A relay
  • D A solenoid
Answer: Option A
Q12
What is the reluctance of a material that has a length of 0.045 m, a cross-sectional area of 0.015 m2, and a permeability of 2500 µWb/At·m?
  • A 833.33 µAt/Wb
  • B 0.27 At/Wb
  • C 1200 At/Wb
  • D More information is needed in order to find the reluctance.
Answer: Option C
Q13
The unit of flux density is known as
  • A magnetomotive force
  • B a weber
  • C a maxwell
  • D a tesla
Answer: Option D
Q14
What do you call the characteristic of a magnetic material whereby a change in magnetization lags the application of a magnetizing force?
  • A Hysteresis
  • B Induction
  • C Retentivity
  • D Reluctance
Answer: Option A
Q15
Which electromagnetic device has a movable iron core called a plunger?
  • A A speaker
  • B A dc generator
  • C A relay
  • D A solenoid
Answer: Option D
Q16
Which electromagnetic device contains an armature?
  • A A speaker
  • B A dc generator
  • C A relay
  • D A solenoid
Answer: Option D
Q17
The polarity of induced voltage while a field is collapsing is
  • A independent of the force creating the field
  • B opposite to the force creating the field
  • C identical to the force creating the field
  • D present only if the force is stationary
Answer: Option B
Q18
The unit of magnetic flux density is the weber.
  • A TRUE
  • B FALSE
Answer: Option B
Q19
The ability of a material to maintain a magnetized state (without the presence of a magnetizing force) is called retentivity.
  • A TRUE
  • B FALSE
Answer: Option A
Q20
Magnetic flux flows from the north pole to the south pole within the magnet.
  • A TRUE
  • B FALSE
Answer: Option B

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