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MCQs

Total Questions : 112 | Page 11 of 12 pages
Question 101. If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be
  1.    None of the listed here
  2.    Zero
  3.    Large
  4.    Small
 Discuss Question
Answer: Option C. -> Large
Question 102. An air gap is usually inserted in magnetic circuits to
  1.    Increase the flux
  2.    None of the listed here
  3.    Prevent saturation
  4.    Increase m.m.f.
 Discuss Question
Answer: Option C. -> Prevent saturation
Question 103. Silicon steel is used in electrical machines because it has
  1.    Low retentivity
  2.    High coercivity
  3.    Low hysteresis loss
  4.    Low coercivity
 Discuss Question
Answer: Option C. -> Low hysteresis loss
Question 104. The relative permeability of a ferromagnetic material is
  1.    More than one
  2.    More than 10
  3.    More than 100 Ωr 1000
  4.    Less than one
 Discuss Question
Answer: Option C. -> More than 100 Ωr 1000
Question 105. The unit of retentivity is
  1.    Ampere turns
  2.    Weber
  3.    Ampere turn/meter
  4.    Weber/sq. m
 Discuss Question
Answer: Option D. -> Weber/sq. m
Question 106. Energy stored by a coil is doubled when its current is increased by percent.
  1.    41.4
  2.    44.6
  3.    42.5
  4.    47.5
 Discuss Question
Answer: Option A. -> 41.4
Question 107. The unit of reluctance is
  1.    Meter/Henry
  2.    1/Henry
  3.    Henry
  4.    Henry/meter
 Discuss Question
Answer: Option B. -> 1/Henry
Question 108. Conductivity is analogous to
  1.    Resistivity
  2.    Inductance
  3.    Permeability
  4.    Retentivity
 Discuss Question
Answer: Option C. -> Permeability
Question 109. Hard steel is suitable for making permanent magnets because
  1.    It has good residual magnetism
  2.    Its mechanical strength is high
  3.    Its hysteresis loop has large area
  4.    Its mechanical strength is low
 Discuss Question
Answer: Option A. -> It has good residual magnetism
Question 110. Hysteresis loss least depends on
  1.    Frequency
  2.    Ambient temperature
  3.    Steinmetz’s coefficient of material
  4.    Volume of material
 Discuss Question
Answer: Option B. -> Ambient temperature

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