Quiz  /  MCQ On Moving Coil Galvanometer

  • 1. 
    The deflection θ is related to the electric current I in a galvanometer by the relation

  • I ∝ θ
  • I ∝ tan θ
  • I ∝ sin θ
  • I ∝ cos θ

  • 2. 
    A moving coil galvanometer carries a current I and the magnetic field B is radial. The coil has N number of turns and an effective area A. The torque acting on the coil of a moving coil galvanometer is given by

  • NA
  • B
  • I
  • NABI
  • NABI
  • N
  • ABI

  • 3. 
    The sensitivity of a moving coil galvanometer can be increased by decreasing

  • The number of turns in the coil
  • The area of the coil
  • The magnetic field
  • The couple per unit twist of the suspension

  • 4. 
    In ballistic galvanometer, the frame on which the coil is wound is non-metallic. It is

  • To avoid the production of induced e.m.f
  • To avoid the production of eddy currents
  • To increase the production of eddy currents
  • To increase the production of induced e.m.f

  • 5. 
    The reason the coil is bound over the metallic frame in moving coil galvanometer is

  • The metallic frame helps in oscillation
  • The metallic frame helps in making steady deflection without any oscillation
  • The metallic frame increases the magnetic field
  • None of the above

  • 6. 
    The deflection in moving coil galvanometer is

  • Inversely proportional to the area of the coil
  • Directly proportional to the torsional constant
  • inversely proportional to the current flowing
  • Directly proportional to the number of turns of the coil

  • 7. 
    The pole pieces of the magnet used in a pivoted coil galvanometer are

  • Plane surfaces of a horse-shoe magnet
  • Cylindrical surfaces of a bar magnet
  • Plane surfaces of a bar magnet
  • Cylindrical surfaces of a horse-shoe magnet

  • 8. 
    A current-carrying rectangular coil placed in a uniform magnetic field. In which orientation will the coil rotate?

  • In any orientation
  • The magnetic field is parallel to the plane of the coil
  • The magnetic field is at 45
  • with the plane of the coil
  • The magnetic field is perpendicular to the plane

  • 9. 
    What is the shape of a magnet in moving coil galvanometer to make the radial magnetic field?

  • Convex cylindrical magnet
  • Horse-shoe magnet
  • Concave cylindrical magnet
  • None

  • 10. 
    Phospher- bronze wire is used in suspension because it has

  • A large couple per unit twist
  • A small couple per unit twist
  • Low conductivity
  • High Sensitivity
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