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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