Electromagnetic Induction & Alternating Current Test21

Written by Administrator on 04 June 2013.

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  1. In all transformers _____.
  2. A fuse wire has a current rating of 5 A. Then the peak value of the current in the fuse wire is _____.
  3. The number of coils wound on the armature of a single phase a.c. generator is _____.
  4. The voltage Vc across capacitor in an LCR circuit _____.
  5. A coil of area of cross section 0.5 m2 with 10 turns is in a plane which is perpendicular to an uniform magnetic field of 0.2 wb/m2. The flux through the coil is _____.
  6. The unit of inductive reactance is _____.
  7. The instantaneous value of current generated by AC generator is _____.
  8. The strength of current produced in a generator is _____.
  9. The mutual induction between two coils when the current of 2 A changes to 6 A in 2 seconds and induces an emf of 20 mV in the secondary coil, is _____.
  10. A small piece of metal wire is dragged across the gap between the pole pieces of a magnet in 0.5 second. The magnetic flux between the pole pieces is 8 ´ 10-4 Wb. The emf induced in the wire is _____.



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