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MCQs

Total Questions : 575 | Page 2 of 58 pages
Question 11. Tesla is a unit of
  1.    field strength
  2.    inductance
  3.    flux density
  4.    flux
 Discuss Question
Answer: Option C. -> flux density
Question 12. The bar magnet has
  1.    the dipole moment
  2.    monopole moment
  3.    (A) and (B) both
  4.    none of the above
 Discuss Question
Answer: Option A. -> the dipole moment
Question 13. The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength?
  1.    2500 AT/m
  2.    250 AT/m
  3.    25 AT/m
  4.    2.5 AT/m
 Discuss Question
Answer: Option B. -> 250 AT/m
Question 14. If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity
  1.    less than that of disc but in opposite direction
  2.    equal to that of disc and in the same direction
  3.    equal to that of disc and in the opposite direction
  4.    less than that of disc and in the same direction
 Discuss Question
Answer: Option D. -> less than that of disc and in the same direction
Question 15. The unit of relative permeability is
  1.    henry/metre
  2.    henry
  3.    henry/sq. m
  4.    it is dimensionless
 Discuss Question
Answer: Option D. -> it is dimensionless
Question 16. A 200 turn coil having an axial length of 30 mm and a radius of 10 mm is pivoted in a magnetic field having a flux density of 0.8 T. If the coil carries a current of 0.5 A, the torque acting on the coil will be [Hint. Torque = 2BIlNr N-m]
  1.    8 N-m
  2.    0.48 N-m
  3.    0.048 N-m
  4.    0.0048 N-m
 Discuss Question
Answer: Option C. -> 0.048 N-m
Question 17. The initial permeability of an iron rod is
  1.    the highest permeability of the iron rod
  2.    the lowest permeability of the iron rod
  3.    the permeability at the end of the iron rod
  4.    the permeability almost in non-magnetised state
 Discuss Question
Answer: Option D. -> the permeability almost in non-magnetised state
Question 18. The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields
  1.    meter is surrounded by strong magnetic fields
  2.    a soft iron shielding is used
  3.    a plastic shielding is provided
  4.    a shielding of anon-magnetic material is used
 Discuss Question
Answer: Option B. -> a soft iron shielding is used
Question 19. Unit for quantity of electricity is
  1.    ampere-hour
  2.    watt
  3.    joule
  4.    coulomb
 Discuss Question
Answer: Option D. -> coulomb
Question 20. The main constituent of permalloy is
  1.    cobalt
  2.    chromium
  3.    nickel
  4.    tungsten
 Discuss Question
Answer: Option C. -> nickel

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