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MCQs

Total Questions : 112 | Page 3 of 12 pages
Question 21. The relative permeability of a ferromagnetic material is
  1.    Less than one
  2.    More than one
  3.    More than 10
  4.    More than 100 Ωr 1000
 Discuss Question
Answer: Option D. -> More than 100 Ωr 1000
Question 22. Energy stored by a coil is doubled when its current is increased by percent.
  1.    25
  2.    50.14
  3.    41.4
  4.    100
 Discuss Question
Answer: Option C. -> 41.4
Question 23. The unit of reluctance is
  1.    Meter/Henry
  2.    Henry/meter
  3.    Henry
  4.    1/Henry
 Discuss Question
Answer: Option D. -> 1/Henry
Question 24. Hard steel is suitable for making permanent magnets because
  1.    It has good residual magnetism
  2.    Its hysteresis loop has large area
  3.    Its mechanical strength is high
  4.    Its mechanical strength is low
 Discuss Question
Answer: Option A. -> It has good residual magnetism
Question 25. Hysteresis loss least depends on
  1.    Volume of material
  2.    Frequency
  3.    Steinmetz’s coefficient of material
  4.    Ambient temperature
 Discuss Question
Answer: Option D. -> Ambient temperature
Question 26. The rate of rise of current through an inductive coil is maximum
  1.    At 63.2% of its maximum steady value
  2.    At the start of the current flow
  3.    After one time constant
  4.    Near the final maximum value of current
 Discuss Question
Answer: Option B. -> At the start of the current flow
Question 27. The property of a material which opposes the creation of magnetic flux in it is known as
  1.    Reluctivity
  2.    Magneto-motive force
  3.    Permeance
  4.    Reluctance
 Discuss Question
Answer: Option D. -> Reluctance
Question 28. Conductivity is analogous to
  1.    Retentivity
  2.    Resistivity
  3.    Permeability
  4.    Inductance
 Discuss Question
Answer: Option C. -> Permeability
Question 29. What is a permeable substance?
  1.    Any good conductor
  2.    Any bad conductor
  3.    Any strong magnet
  4.    Any substance through which the magnetic lines of force can pass easily
 Discuss Question
Answer: Option D. -> Any substance through which the magnetic lines of force can pass easily
Answer: (d).Any substance through which the magnetic lines of force can pass easily
Question 30. Unit of MMF is ______________
  1.    A/m
  2.    A-m
  3.    A
  4.    unitless
 Discuss Question
Answer: Option C. -> A
Answer: (c).A

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