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MCQs

Total Questions : 575 | Page 5 of 58 pages
Question 41. Two infinitely long parallel conductors in vacuum any separated 1 metre between centers >then a current of 1 ampere flows the. uk each conductor, produce on each other a force of
  1.    2 x 1(T2 N/m)
  2.    2 x KT3 N/m
  3.    2 x 10"5 N/m
  4.    2x 1(T7 N/m)
 Discuss Question
Answer: Option D. -> 2x 1(T7 N/m)
Question 42. A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will
  1.    Increase
  2.    Decrease
  3.    Remain constant
  4.    Be excessive
 Discuss Question
Answer: Option B. -> Decrease
Question 43. Materials subjected to rapid reversal of magnetism should have
  1.    large area oiB-H loop
  2.    high permeability and low hysteresis loss
  3.    high co-ercivity and high retentivity
  4.    high co-ercivity and low density
 Discuss Question
Answer: Option B. -> high permeability and low hysteresis loss
Question 44. Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials.
  1.    circular
  2.    triangular
  3.    rectangular
  4.    none of the above
 Discuss Question
Answer: Option C. -> rectangular
Question 45. A permeable substance is one
  1.    which is a good conductor
  2.    which is a bad conductor
  3.    which is a strong magnet
  4.    through which the magnetic lines of force can pass very easily
 Discuss Question
Answer: Option D. -> through which the magnetic lines of force can pass very easily
Question 46. The relative permeability of materials is not constant.
  1.    diamagnetic
  2.    paramagnetic
  3.    ferromagnetic
  4.    insulating
 Discuss Question
Answer: Option C. -> ferromagnetic
Question 47. The stray line of magnetic flux is defined as
  1.    a line vertical to the flux lines
  2.    the mean length of a ring shaped coil
  3.    a line of magnetic flux in a non-uniform field
  4.    a line of magnetic flux which does not follow the designed path
 Discuss Question
Answer: Option D. -> a line of magnetic flux which does not follow the designed path
Question 48. When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle
  1.    will be zero
  2.    will be infinite
  3.    will depend on the amount of e.m.f. applied
  4.    will depend on the radius of the circle
 Discuss Question
Answer: Option D. -> will depend on the radius of the circle
Question 49. The left hand rule correlates to
  1.    current, induced e.m.f. and direction of force on a conductor
  2.    magnetic field, electric field and direction of force on a conductor
  3.    self induction, mutual induction and direction of force on a conductor
  4.    current, magnetic field and direction of force on a conductor
 Discuss Question
Answer: Option D. -> current, magnetic field and direction of force on a conductor
Question 50. The magnetic reluctance of a material
  1.    decreases with increasing cross sectional area of material
  2.    increases with increasing cross-sec-tional area of material
  3.    does not vary with increasing cross-sectional area of material
  4.    any of the above
 Discuss Question
Answer: Option A. -> decreases with increasing cross sectional area of material

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