Q. No.When a \(\mathrm{p\text-n}\) junction is formed, the atoms on the \(\mathrm p\)-side are:
| 1. | neutral | 2. | slightly positive |
| 3. | slightly negative | 4. | all negative |
Subtopic: Â PN junction |
Level 4: Below 35%
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The circuit shown in figure is given an input signal \(V_i,\) which varies with time and the corresponding output is \(V_o.\) Then,
| 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 \(V_i<E\) |
Subtopic: Â PN junction |
Level 3: 35%-60%
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The voltage \(V_{AB}=20~\text{V}\) at its peak value, and is sinusoidal in time. The current \(i\) (in amperes), when plotted as a function of time, is given by:
(consider the diodes as ideal.)
(consider the diodes as ideal.)
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Â PN junction |
Level 3: 35%-60%
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A voltage \(V_{AB}\) is applied to the left side input and the potential differences \(V_{AX}\) and \(V_{XY}\) are measured. Assume the diodes are ideal i.e., there is no potential difference across the diodes in forward bias. Which of the following is true?
1. \(\text{If}~V_{AB}>0, V_{AX}>0\)
2. \(\text{If}~V_{AB}>0, V_{XY}>0\)
3. \(\text{If}~V_{AB}<0, V_{XY}>0\)
4. \(\text{If}~V_{AB}<0, V_{AX}>0\)
1. \(\text{If}~V_{AB}>0, V_{AX}>0\)
2. \(\text{If}~V_{AB}>0, V_{XY}>0\)
3. \(\text{If}~V_{AB}<0, V_{XY}>0\)
4. \(\text{If}~V_{AB}<0, V_{AX}>0\)
Subtopic: Â PN junction |
Level 3: 35%-60%
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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: Â PN junction |
Level 3: 35%-60%
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The current-voltage characteristic of an ideal \(\mathrm{p \text{-}n}\) junction diode is given by the graph as shown in the following figure:
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)
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. | \(V_{A B}=i\cdot5+\left(0.6+5\right)\) |
Subtopic: Â PN junction |
Level 3: 35%-60%
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\(D_1,D_2,D_3\) one identical diodes: each having a threshold voltage of \(0.6~\text V,\) beyond which the current increases exponentially in forward bias. The diodes don't conduct in reverse bias. \(i\) is the current flowing in at \(A,\) when \(V_{AB}=V_A-V_B>0.\) The variation of \(i\) versus \(V_{AB}\) is best given by:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Â PN junction |
 50%
Level 3: 35%-60%
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When a \(\mathrm{p\text-n}\) junction is reverse-biased,
| 1. | no current flows at all for any voltage |
| 2. | a very small current flows, independent of voltage |
| 3. | a small current flows for ordinary voltages, but a very large current may flow if the voltage is increased above a threshold |
| 4. | no current flows for ordinary voltage, but a large current flows when voltage exceeds a threshold |
Subtopic: Â PN junction |
Level 3: 35%-60%
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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: Â PN junction |
Level 3: 35%-60%
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The voltage versus current characteristics of the following circuit is measured: a plot of the current \(i\) versus the voltage drop \(V_{AB}\) is made. Which, of the following graphs, shows the correct variation?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Â PN junction |
 53%
Level 3: 35%-60%
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