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16 .
The attraction between the nucleus and valence electron of copper atom is
| A. | zero |
| B. | weak |
| C. | strong |
| D. | either zero or strong |
17 .
If the temperature of an extrinsic semiconductor is increased so that the intrinsic carrier concentration is doubled, then
| A. | the majority carrier density is doubled |
| B. | the minority carrier density is doubled |
| C. | the minority carrier density becomes 4 times the original value |
| D. | both the majority and minority carrier densities double |
18 .
The units of μ0 and μr are
| A. | H/m for both |
| B. | H/m for μr and no units for μ0 |
| C. | H/m for μ0 and no units for μr |
| D. | Wb/m for μ0 and no units for μr |
19 .
Hydrogen is used in
| A. | large size transformers |
| B. | MCB |
| C. | large size generators |
| D. | circuit breakers |
20 .
An RLC series circuit is underdamped. To make it overdamped, the value of R
| A. | has to be increased |
| B. | has to be decreased |
| C. | has to be increased to infinity |
| D. | has to be reduced to zero |
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