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Q. No.A voltage regulating circuit consisting of Zener diode, having break-down voltage of \(10 ~\text{V}\) and maximum power dissipation of \(0.4~ \text{W},\) is operated at \(15 ~\text{V}.\) The approximate value of protective resistance in this circuit is: (in \(\Omega\))
1. \(100\)
2. \(150\)
3. \(125\)
4. \(130\)
Subtopic: Β Applications of PN junction |
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For the given logic gate circuit, which of the following is the correct truth table?
| 1. | \(\begin{array}{c|c|c} {n} &{~m} & {z} \\ \hline 0 & 0 & 1 \\ 0 & 1 & 0 \\ 1 & 1 & 0 \\ 1 & 0 & 0 \end{array}\) | 2. | \(\begin{array}{c|c|c} {n} & {~m} & {z} \\ \hline 0 & 0 & 0 \\ 0 & 1 & 1 \\ 1 & 1 & 0 \\ 1 & 0 & 1 \end{array}\) |
| 3. | \(\begin{array}{c|c|c} {n} & {~m} & {z} \\ \hline 0 & 0 & 1 \\ 0 & 1 & 0 \\ 1 & 1 & 1 \\ 1 & 0 & 0 \end{array}\) | 4. | \(\begin{array}{c|c|c} {n} &{~m} & {z} \\ \hline 0 & 0 & 1 \\ 0 & 1 & 1 \\ 1 & 1 & 0 \\ 1 & 0 & 0 \end{array}\) |
Subtopic: Β Logic gates |
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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: Β PN junction |
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Level 3: 35%-60%
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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: Β PN junction |
Level 3: 35%-60%
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Given below are two statements:
Choose the correct answer from the options given below:
| Assertion (A): | A diode under reverse-biased condition provides very small current which is nearly independent of voltage until a critical limit at which the current increases drastically. |
| Reason (R): | Below the critical voltage limit, only majority charge carries flow which increases drastically above critical voltage. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Β Applications of PN junction |
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A diode has Zener voltage of \(10~\text{V}\) and maximum power dissipation of \(0.5~\text{W},\) then the minimum resistance to be used in series with this diode for safety when it is connected to a \(25~\text{V}\) power supply is:
1. \(100~\Omega\)
2. \(250~\Omega\)
3. \(300~\Omega\)
4. \(350~\Omega\)
1. \(100~\Omega\)
2. \(250~\Omega\)
3. \(300~\Omega\)
4. \(350~\Omega\)
Subtopic: Β Applications of PN junction |
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If \(X\) and \(Y\) are the inputs, the given circuit works as:
1. \(\mathrm{OR}\) gate
2. \(\mathrm{AND}\) gate
3. \(\mathrm{NAND}\) gate
4. \(\mathrm{NOR}\) gate
1. \(\mathrm{OR}\) gate
2. \(\mathrm{AND}\) gate
3. \(\mathrm{NAND}\) gate
4. \(\mathrm{NOR}\) gate
Subtopic: Β Logic gates |
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For the given circuit (shown in part \((A)\)) the time dependent input voltage \(v_{i n}(t)\) and corresponding output \(v_{o}(t)\) are shown in part (\(B\)) and part (\(C\)), respectively. Identify the components that are used in the circuit between points \(X\) and \(Y\).
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Β Applications of PN junction |
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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: Β PN junction |
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Refer to the logic circuit given below. For two inputs \((A=1, B=1) \text { and }(A=0, B=1) \text {,}\) output \((Y)\) will be:
1. \(1,0\) respectively
2. \(0,1\) respectively
3. \(0,0\) respectively
4. \(1,1\) respectively
1. \(1,0\) respectively
2. \(0,1\) respectively
3. \(0,0\) respectively
4. \(1,1\) respectively
Subtopic: Β Logic gates |
Β 77%
Level 2: 60%+
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