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Q. No.For a diode connected in parallel with a resistor, Choose the correct graph between \((I)\) and \((V)\) for the given circuit:
1.
2.
3.
4.
Subtopic: PN junction |
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The \(\mathrm{n} \text-\)side of the depletion layer of a \(\mathrm{p\text-n}\) junction:
| 1. | always has the same width as the \(\mathrm{p} \text-\)side |
| 2. | has no bound charges |
| 3. | is negatively charged |
| 4. | is positively charged |
Subtopic: PN junction |
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Choose the Incorrect statement for the half-wave rectifier out of the following statements:
| 1. | The maximum theoretical efficiency is \(40.6\%\). |
| 2. | A DC-ammeter connected to the output of the rectifier reads \(I_0\over \pi\) current where \(I_0\) is the peak value of current in the circuit. |
| 3. | An AC-ammeter connected to the output of the rectifier reads \(\frac{I_0}{\sqrt{2}}\) current where \(I_0\) is the peak value of current in the circuit. |
| 4. | Ripple factor is greater than one. |
Subtopic: Rectifier |
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Choose the incorrect statement about light-emitting diodes (LED):
| 1. | This is a \(\mathrm{p\text-n}\) junction in forward biasing. |
| 2. | Usually, it is prepared from Gallium-arsenide-phosphide. |
| 3. | It can be prepared from \(\mathrm{Si}\) or \(\mathrm{Ge}\). |
| 4. | \(\mathrm{p}\)-layer is kept in the uppermost portion. |
Subtopic: Applications of PN junction |
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Zener diodes with breakdown voltage ranging over \((2~\text{V}\text-200~\text{V})\) are commercially available. The breakdown voltage of a Zener diode:
| 1. | increases with increasing doping concentration. |
| 2. | decreases with increasing doping concentration. |
| 3. | does not depend on doping concentration. |
| 4. | may increase or decrease with increasing doping concentration. |
Subtopic: Applications of PN junction |
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What will be the change in the current through the \(5~\text V\) cell if the diode \(D\) is reversed?
1. No change
2. Increases by \(0.2~\text A\)
3. Increases by \(0.3~\text A\)
4. Decreases by \(0.2~\text A \)
1. No change
2. Increases by \(0.2~\text A\)
3. Increases by \(0.3~\text A\)
4. Decreases by \(0.2~\text A \)
Subtopic: PN junction |
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Consider the circuit shown in the figure given below. The input voltage is \(V_i\), the current through the diode is \(I_z\), and the current through the load is \(I_L\).
| 1. | \(\text{If} ~{V_i}= 15~\text{V}~\text{and}~{R_L}= 40~\Omega, ~\text{and}~{I_z}= 0.375~\text{A}\) |
| 2. | \(\text{If} ~{V_i}= 10~\text{V}~\text{and}~{R_L}= 5~\Omega, ~\text{and}~{I_L}=1~\text{A}\) |
| 3. | \(\text{If} ~{V_i}= 20~\text{V}~\text{and}~{R_L}= 20~\Omega, ~\text{and}~{I_z}= 0.25~\text{A}\) |
| 4. | \(\text{If} ~{V_i}= 20~\text{V}~\text{and}~{R_L}= 10~\Omega, ~\text{and}~{I_z}= 0.5~\text{A}\) |
Subtopic: Applications of PN junction |
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In the circuit shown in the diagram given below, \(R\) is a small resistor, \(V_i\) is the input voltage between \(A\) & \(B\) while \(V_o\) is the output voltage between \(C\) & \(D\).
Consider the following two statements and mark the correct option.
Consider the following two statements and mark the correct option.
| (I) | \(\text{If}~V_i>2~\text{V}, ~\text{then}~V_o = V_i\) |
| (II) | \(\text{If}~V_i<2~\text{V}, ~\text{then}~V_o = 2~\text{V}\) |
| 1. | (I) is True. |
| 2. | (II) is True. |
| 3. | (I) and (II) are both True. |
| 4. | (I) and (II) are both False. |
Subtopic: PN junction |
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Assuming that the diode is ideal, the output waveform for the circuit (shown in the figure) is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Rectifier |
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