Exercise: Materials And Components

Questions for: Materials And Components

The residual resistivity of a binary alloy at 0 K is
A:
sum of residual resistivities of component metals
B:
difference of residual resistivities of component metals
C:
product of residual resistivities of component metals
D:
dependent on the concentration of minor component in the alloy
Answer: D
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A conductor carries 10 A current in + x direction and is lying in a field having a flux density 0.2 T directed along + z direction. The magnitude of force per metre length and direction are
A:
2 N, + y direction
B:
2 N, - y direction
C:
0.02 N, + y direction
D:
0.02 N, - y direction
Answer: B
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A magnetic field exists around
A:
moving charges
B:
static charges
C:
iron
D:
copper
Answer: A
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The unit for mmf is
A:
A
B:
Wb
C:
T
D:
V
Answer: A
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Consider the following materials
  1. Nickel
  2. Silver
  3. Oxygen
  4. Aluminium
The correct sequence in the order of decreasing permeability is
A:
1, 4, 3, 2
B:
1, 4, 2, 3
C:
4, 1, 3, 2
D:
4, 1, 2, 3
Answer: B
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