Q. No.In a semiconductor \(\mathrm{p\text-n}\) diode, the doping concentrations on \(\mathrm{p\text-}\)side and \(\mathrm{n\text-}\)side are \(10^{15}~\text{atoms/cm}^3\)
| 1. | Widths of depletion region on either side of the interface are equal |
| 2. | The depletion region widths is more on \(\mathrm{p\text-}\)side compared to that in \(\mathrm{n\text-}\)side |
| 3. | The depletion region widths is more on \(\mathrm{n\text-}\)side compared to that in \(\mathrm{p\text-}\)side |
| 4. | No depletion region forms because of unequal doping concentrations on \(\mathrm{p}\) and \(\mathrm{n\text-}\)sides |
Subtopic: PN junction |
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Consider a circuit consisting of a capacitor \((20 ~\mu \text{F})\), resistor (\(100~\Omega\)) and two identical diodes as shown in figure. The resistance of diode under forward biasing condition is \(10~\Omega\). The time constant of the circuit is \(\alpha\times10^{-3}~\text{s}\). The value of \(\alpha\) is:
1. \(2.2\)
2. \(2.0\)
3. \(2.1\)
4. \(2.4\)
1. \(2.2\)
2. \(2.0\)
3. \(2.1\)
4. \(2.4\)
Subtopic: PN junction |
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Assuming in forward bias condition there is a voltage drop of \(0.7~\text{V}\) across a silicon diode, the current through diode \(\mathrm D_1\) in the circuit is: (in mA) ( Assume all diodes in the given circuit are identical)
1. \(20.15\)
2. \(11.7\)
3. \(17.6\)
4. \(18.8\)
1. \(20.15\)
2. \(11.7\)
3. \(17.6\)
4. \(18.8\)
Subtopic: PN junction |
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Two \(\mathrm{p\text-n}\) junction diodes \(D_1\) and \(D_2\) are connected as shown in figure. \(A\) and \(B\) are input signals and \(C\) is the output. The given circuit will function as a:
1. OR Gate
2. NOR Gate
3. NAND Gate
4. AND Gate
1. OR Gate
2. NOR Gate
3. NAND Gate
4. AND Gate
Subtopic: PN junction |
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Refer to the circuit diagram given in the figure. Which of the following observations are correct?
Choose the correct answer from the options given below:
1. (B), (C) and (E) only
2. (A), (B) and (D) only
3. (A), (C) and (D) only
4. (A), (B) and (C) only
| (A) | Total resistance of circuit is \(6~\Omega\) |
| (B) | Current in Ammeter is \(1~\text A\) |
| (C) | Potential across AB is \(4~\text {Volts}\) |
| (D) | Potential across CD is \(4~\text {Volts}\) |
| (E) | Total resistance of the circuit is \(8~\Omega\) |
1. (B), (C) and (E) only
2. (A), (B) and (D) only
3. (A), (C) and (D) only
4. (A), (B) and (C) only
Subtopic: PN junction |
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Which of the following circuits represents a forward biased diode?
Choose the correct answer from the options given below:
1. (B), (C) and (E) only
2. (C) and (E) only
3. (B), (D) and (E) only
4. (A) and (D) only
Choose the correct answer from the options given below:
1. (B), (C) and (E) only
2. (C) and (E) only
3. (B), (D) and (E) only
4. (A) and (D) only
Subtopic: PN junction |
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Which of the diode circuit shows correct biasing used for the measurement of dynamic resistance of p-n junction diode –
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: PN junction |
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In the circuit shown below, a \(\mathrm{Si}\) diode and a \(\mathrm{Ge}\) diode are connected in series with resistors of \(2.5~\text{k}\Omega\) and \(2.5~\text{k}\Omega,\) across a \(15 ~\text V\) supply. If the forward voltage drops of the \(\mathrm{Si}\) and \(\mathrm{Ge}\) diodes are \(0.7 ~\text V\) and \(0.3 ~\text V,\) respectively, what is the potential difference across the \(2.5~\text{k}\Omega\) resistor?
| 1. | \(9.25~\text{V}\) | 2. | \(6.25~\text{V}\) |
| 3. | \(8.75~\text{V}\) | 4. | \(9.75~\text{V}\) |
Subtopic: PN junction |
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In which of the following circuits the diode is reverse-biased?
| (i) |  |
| (ii) |  |
| (iii) |  |
| (iv) |  |
| 1. | (ii) | 2. | (i) and (iv) |
| 3. | (iv) | 4. | (i) |
Subtopic: PN junction |
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Consider the network shown in the figure where the diodes are ideal: a \(15~\Omega\) resistor is connected in the top branch, a \(10~\Omega\) resistor in series with a diode is in the middle branch, and a \(5~\Omega\) resistor in series with a diode is in the bottom branch, with the left terminal connected to \(+6~\text{V}\) and the right terminal connected to \(-8~\text{V}.\) What is the equivalent resistance of the network between the two terminals?
| 1. | \(12~ \Omega \) | 2. | \(36~ \Omega \) |
| 3. | \(20~ \Omega \) | 4. | \(6~ \Omega \) |
Subtopic: PN junction |
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