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MCQs

Total Questions : 112 | Page 10 of 12 pages
Question 91. Those magnetic materials are best suited for making armature and transformer cores which have ________permeability and _________hysteresis loss.
  1.    Low, high
  2.    High, low
  3.    Low, low
  4.    High, high
 Discuss Question
Answer: Option B. -> High, low
Question 92. The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is ___________Vs
  1.    20
  2.    70
  3.    50
  4.    500
 Discuss Question
Answer: Option A. -> 20
Question 93. In a magnetic material hysteresis loss takes place primarily due to
  1.    Rapid reversals of its magnetization
  2.    Flux density lagging behind magnetizing force
  3.    Molecular friction
  4.    It high retentivity
 Discuss Question
Answer: Option D. -> It high retentivity
Question 94. Relative permeability of vacuum is
  1.    3
  2.    5
  3.    6
  4.    1
 Discuss Question
Answer: Option D. -> 1
Question 95. Permeability in a magnetic circuit corresponds to_________ in an electric circuit.
  1.    Resistivity
  2.    Conductance
  3.    Conductivity
  4.    Resistance
 Discuss Question
Answer: Option C. -> Conductivity
Question 96. Conductance is analogous to
  1.    Flux
  2.    Inductance
  3.    Reluctance
  4.    Permeance
 Discuss Question
Answer: Option D. -> Permeance
Question 97. Reciprocal of reluctance is
  1.    Susceptibility
  2.    Permeance
  3.    Reluctivity
  4.    Permeability
 Discuss Question
Answer: Option B. -> Permeance
Question 98. A material for good magnetic memory should have
  1.    Low hysteresis loss
  2.    High retentivity
  3.    High permeability
  4.    Low retentivity
 Discuss Question
Answer: Option B. -> High retentivity
Question 99. Ferrites have high hysteresis
  1.    Ferrites have low permeability
  2.    Ferrites have high resistance
  3.    None of the listed here
  4.    Ferrites have high resistance
 Discuss Question
Answer: Option D. -> Ferrites have high resistance
Question 100. When both the inductance and resistance of a coil are doubled the value of
  1.    Final steady current is doubled
  2.    Time constant remains unchanged
  3.    Initial rate of rise of current is doubled
  4.    Time constant is halved
 Discuss Question
Answer: Option B. -> Time constant remains unchanged

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