Q. No.A simple \(\mathrm{p\text-n}\) junction diode follows the law: \(i\text{(current)}=i_0e^{qV/kT},\) for large currents in forward bias.
Here, \(T=\) absolute temperature, \(V=\) voltage across the diode, \(k=\) Boltzmann's constant and \(i_0=\) the drift current.
Then, the differential resistance of the diode \(\left(\dfrac{dV}{di}\right)\) is given by:
1. \(\text{(constant)}i\)
2. \(\text{(constant)}i^2\)
3. \(\dfrac{\text{constant}}{i}\)
4. \(\text{(constant)}e^{-\beta i},~\beta\text{-constant}\)
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This diode is connected with a resistance of \(5~\Omega\) in series with it as shown below:
Which of the following shows the dependence of the voltage \(V_{AB}\) and the current \(i,\) when the diode is forward-biased?
(\(V_{AB}\) in volt, \(i\) in ampere)
| 1. | \(V_{A B}=i\cdot5+0.6\) |
| 2. | \(V_{A B}=i\cdot5-0.6\) |
| 3. | \(V_{A B}=i\cdot5+(0.6-5)\) |
| 4. | \(V_{A B}=i\cdot5+\left(0.6+5\right)\) |
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(consider the diodes as ideal.)
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| 1. | \(V_o=V_i+E\) |
| 2. | \(V_o=V_i-E\) |
| 3. | \(V_o=V_i,\) only when \(V_i>E\) |
| 4. | \(V_o=V_i,\) only when \(V_i<E\) |
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1. \(V_A>V_B+V_0\)
2. \(V_A<V_B+V_0\)
3. \(V_A>V_B-V_0\)
4. \(V_A<V_B-V_0\)
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| 1. | no current flows in the circuit |
| 2. | current flows anticlockwise |
| 3. | current flows clockwise |
| 4. | current only flows through \(D_2\) and not through \(D_1\) |
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1. zero2. \(4~\text{mA}\)
3. \(2.5~\text{mA}\)
4. \(0.8~\text{A}\)
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1. zero2. \(20\) mA
3. \(40\) mA
4. \(20\sqrt2\) mA
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