Magnetism and Electromagnetism Practice Tests - Set 08 - ObjectiveBooks

# Practice Test: Question Set - 08

1. When an iron piece is placed in a magnetic field
(A) The magnetic lines of force will bend away from their usual paths in order to go away from the piece
(B) The magnetic lines of force will bend away from their usual paths in order to pass through the piece
(C) The magnetic field will not be affected
(D) The iron piece will break

2. Materials with a low retentivity do not retain a magnetic field very well.
(A) True
(B) False

3. Air gap has __________ reluctance as compared to iron or steel path
(A) Little
(B) Lower
(C) Higher
(D) Zero

4. Tesla is a unit of
(A) Field strength
(B) Inductance
(C) Flux density
(D) Flux

5. The relative permeability is less than unity is case of
(A) Ferromagnetic materials
(B) Ferrites
(C) Nonferrous materials
(D) Diamagnetic materials

6. 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
(A) 8 Nm
(B) 0.48 Nm
(C) 0.048 Nm
(D) 0.0048 Nm

7. The change of cross-sectional area of conductor in magnetic field will affect
(A) Reluctance of conductor
(B) Resistance of conductor
(C) (A) and (B) both in the same way
(D) None of the above

8. The stray line of magnetic flux is defined as
(A) A line vertical to the flux lines
(B) The mean length of a ring shaped coil
(C) A line of magnetic flux in a nonuniform field
(D) A line of magnetic flux which does not follow the designed path

9. Gilbert is a unit of
(A) Electromotive force
(B) Magneto-motive force
(C) Conductance
(D) Permittivity

10. Which of the following statements is correct?
(A) The conductivity of ferrites is better than ferromagnetic materials
(B) The conductivity of ferromagnetic materials is better than ferrites
(C) The conductivity of ferrites is very high
(D) The conductivity of ferrites is same as that of ferromagnetic materials

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