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Electrical Engineering Objective Questions { Material And Components }

43. An ideal conducting material has
A. zero conductivity
B. small conductivity
C. large conductivity
D. infinite conductivity
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44. Superconductors are
A. monovalent metals
B. ferromagneti and antiferromagnetic metals
C. ferrimagnetic metals
D. amorphour thin films of Be, Bi and Fi.
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45. Soft superconductor follow
A. Silsbee's rule alone
B. Meissner effect alone
C. both (a) and (b) above
D. none of the above
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46. Hard superconductors observe
A. breakdown by Silsbee's rule
B. incomplete Meissner effect
C. high critical field and transition temperature
D. all of these
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47. Superconductivity is observed for
A. dc and low frequencies
B. high frequencies
C. microwave frequencies
D. infra-red frequencies
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48. Two wires A and B of the same material and lengths L and 2L have radius r and 2r respectively. The ratio of their specific resistance will be
A. 1:1
B. 1:2
C. 1:4
D. 1:8
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49. The skin depth of copper is found to be 66 im at 1 MHz at a certain temperature. At the same temperature and at 2MHz, the skin depth would be approximately
A. 47 gm
B. 33 1.1M
C. 92 gm
D. 122 11111
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