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Q. No.Consider the circuit shown in the above diagram. The output \((Y)\) of the circuit does not depend on \(A.\) Then, \(Y=\)
1. \(B\) AND \(C\)
2. \(B\) OR \(C\)
3. \(B\)
4. \(C\)
Subtopic: Logic gates |
67%
Level 2: 60%+
Hints
In the circuit shown in the figure, \(V_A>V_B.\) Which of the diodes conduct?
| 1. | only \(D_3\) | 2. | \(D_1\) and \(D_3\) |
| 3. | all of the diodes | 4. | none of the diodes |
Subtopic: PN junction |
53%
Level 3: 35%-60%
Hints
The output \((Y)\) of the logic circuit given above is:
1. \(A\) AND \(C\)
2. \(A\) OR \(C\)
3. always TRUE
4. always FALSE
1. \(A\) AND \(C\)
2. \(A\) OR \(C\)
3. always TRUE
4. always FALSE
Subtopic: Logic gates |
59%
Level 3: 35%-60%
Hints
The voltage drop across a silicon diode \((D)\) which is in forward bias and conducting a small current is approximately \(0.7\) V. Which of the following sources will deliver a voltage of \(3\) V?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: PN junction |
60%
Level 2: 60%+
Hints
The output of the above circuit is:
| 1. | (\(A\) AND \(B\)) | 2. | (\(A\) OR \(B\)) |
| 3. | (\(B\) OR \(C\)) | 4. | none of the above |
Subtopic: Logic gates |
55%
Level 3: 35%-60%
Hints
If the temperature of a diode rises, the current through the diode (keeping voltage constant):
| 1. | increases. |
| 2. | decreases. |
| 3. | remains constant. |
| 4. | may increase or decrease depending on bias. |
Subtopic: PN junction |
65%
Level 2: 60%+
Hints
When a \(\mathrm{p\text-}\)type semi-conductor is put in an electric field \(\vec{E}\) the electrons in the valence band, on average:
| 1. | flow in the direction of the \(\vec{E}\) and cause a current opposite to \(\vec{E}\) |
| 2. | flow opposite to \(\vec{E}\) and cause a current along \(\vec{E}\) |
| 3. | flow along \(\vec{E}\) and cause a current along \(\vec{E}\) |
| 4. | flow opposite to \(\vec{E}\) and cause a current opposite to \(\vec{E}\) |
Subtopic: Types of Semiconductors |
64%
Level 2: 60%+
Hints
The dynamic resistance of a diode is given by; \(R=\dfrac{26}{i(\text{mA})}~\Omega,\) where \(i\) is the diode current.
| Statement I: | If the current through the diode increases, then the dynamic resistance decreases. |
| Statement II: | If the temperature of the diode is increased, with the potential difference fixed, the dynamic resistance decreases. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: PN junction |
73%
Level 2: 60%+
Hints
The output of the circuit given in the diagram is:
| 1. | \(A\) AND \(B\) | 2. | \(A\) OR \(B\) |
| 3. | \(A\) | 4. | \(B\) |
Subtopic: Logic gates |
58%
Level 3: 35%-60%
Hints
The voltage across \(AB\) i.e., \(V_{AB}\) is varied from \(0\) V to \(12\) V. The current through branch \(XY~(i)\) is measured. Then:
| 1. | \(i=0.05\) A if \(V_{AB}\geq10\) V and \(i=\dfrac{V_{AB}}{200~\Omega}\) otherwise |
| 2. | \(i=0.05\) A if \(V_{AB}\leq10\) V and \(i=\dfrac{V_{AB}}{200~\Omega}\) otherwise |
| 3. | \(i=0.05\) A |
| 4. | \(i=\dfrac{V_{AB}}{200~\Omega}\) |
Subtopic: Applications of PN junction |
Level 3: 35%-60%
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