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Q. No.A zener diode with \(5 ~\text{V}\) zener voltage is used to regulate an unregulated dc voltage input of \(25 ~\text{V}.\) For a \(400 ~\Omega\) resistor connected in series, the zener current is found to be \(4\) times load current. The load current \((I_L)\) and load resistance \((R_L)\) are:
1. \(I_L=10 ~\text{mA} ; R_L=500 ~\Omega\)
2. \(I_L=0.02 ~\text{mA} ; R_L=250 ~\Omega\)
3. \(I_L=20 ~\text{mA} ; R_L=250 ~\Omega\)
4. \(I_L=10 ~\text A ; R_L=0.5~ \Omega \)
Subtopic: Β Applications of PN junction |
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In the digital circuit shown in the figure, for the given inputs the \(P \) and \(Q\) values are:
1. \(P=1, Q=1 \)1
2. \(P=1, Q=0 \)0
3. \(P=0, Q=0 \)0
4. \( P=0, Q=1 \)1
1. \(P=1, Q=1 \)1
2. \(P=1, Q=0 \)0
3. \(P=0, Q=0 \)0
4. \( P=0, Q=1 \)1
Subtopic: Β Logic gates |
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In the following circuit, the reading of the ammeter will be: (Take Zener breakdown voltage \(=4 ~\text V~\))
1. \(60~\text{mA}\)
2. \(10~\text{mA}\)
3. \(24~\text{mA}\)
4. \(80~\text{mA}\)
1. \(60~\text{mA}\)
2. \(10~\text{mA}\)
3. \(24~\text{mA}\)
4. \(80~\text{mA}\)
Subtopic: Β Applications of PN junction |
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Consider the following logic circuit. The output is \(Y=0\) when:
| 1. | \(A=1~\) and \(B=1~\) |
| 2. | \(A=1~\) and \(B=0~\) |
| 3. | \(A=0~\) and \(B=1~\) |
| 4. | \(A=0~\) and \(B=0~\) |
Subtopic: Β Logic gates |
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Choose the correct logic circuit for the given truth table having inputs \(A\) and \(B.\)
| Inputs | Output | |
| \(A\) | \(B \) | \(Y \) |
| \(0\) | \(0\) | \(0\) |
| \(0\) | \(1\) | \(0\) |
| \(1\) | \(0\) | \(1\) |
| \(1\) | \(1\) | \(1\) |
| 1. |  |
| 2. |  |
| 3. |  |
| 4. |  |
Subtopic: Β Logic gates |
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Level 1: 80%+
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The truth table corresponding to the circuit given below is:
| 1. | \(\begin{array}{|c|c|c|} \hline \mathrm{A} & \mathrm{~B} & \mathrm{C} \\ \hline 0 & 0 & 0 \\ \hline 1 & 0 & 0 \\ \hline 0 & 1 & 0 \\ \hline 1 & 1 & 1 \\ \hline \end{array}~\) | 2. | \(\begin{array}{|c|c|c|} \hline \mathrm{A} & \mathrm{~B} & \mathrm{C} \\ \hline 0 & 0 & 1 \\ \hline 1 & 0 & 0 \\ \hline 0 & 1 & 0 \\ \hline 1 & 1 & 0 \\ \hline \end{array}~\) |
| 3. | \(\begin{array}{|c|c|c|} \hline \mathrm{A} & \mathrm{~B} & \mathrm{C} \\ \hline 0 & 0 & 0 \\ \hline 0 & 1 & 0 \\ \hline 1 & 0 & 1 \\ \hline 1 & 1 & 1 \\ \hline \end{array}~\) | 4. | \(\begin{array}{|c|c|c|} \hline \mathrm{A} & \mathrm{~B} & \mathrm{C} \\ \hline 0 & 0 & 1 \\ \hline 0 & 1 & 0 \\ \hline 1 & 0 & 0 \\ \hline 1 & 1 & 0 \\ \hline \end{array}~\) |
Subtopic: Β Logic gates |
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The output voltage in the following circuit is:
(Consider ideal diode case)
1. \(10~\text V \)
2. \(0~\text V \)
3. \(+5~\text V \)
4. \(-5~\text V \)
(Consider ideal diode case)
1. \(10~\text V \)
2. \(0~\text V \)
3. \(+5~\text V \)
4. \(-5~\text V \)
Subtopic: Β Applications of PN junction |
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The Boolean expression \({Y}=A \bar{B} C+\bar{A} \bar{C} \) can be realised with which of the following gate configurations.
Choose the correct answer from the options given below:
| \(\mathrm{A.}\) | One \(3\text-\)input AND gate, \(3\text-\) NOT gates and one \(2\text-\)input OR gate, One \(2\text-\)input AND gate |
| \(\mathrm{B.}\) | One \(3\text-\)input AND gate, \(1\) NOT gate, One \(2\text-\)input NOR gate and one \(2\text-\)input OR gate |
| \(\mathrm{C.}\) | \(3\text-\)input OR gate, \(3\) NOT gates and one \(2\text-\)input AND gate |
| 1. | \(\mathrm{A,C~\text{Only}}\) | 2. | \(\mathrm{A,B,C~\text{Only}}\) |
| 3. | \(\mathrm{B,C~\text{Only}}\) | 4. | \(\mathrm{A,B~\text{Only}}\) |
Subtopic: Β Logic gates |
Β 54%
Level 3: 35%-60%
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Consider a \(\mathrm{n\text-}\)type semiconductor in which \(\mathrm{n}_\mathrm{e}\) and \(\mathrm{n_h}\) are number of electrons and holes, respectively.
Choose the correct answer from the options given below:
| \(\mathrm{A}.\) | Holes are minority carriers |
| \(\mathrm{B}.\) | The dopant is a pentavalent atom |
| \(\mathrm{C}.\) | \(\mathrm{n}_{\mathrm{e}} \mathrm{n}_{\mathrm{h}} \neq \mathrm{n}_{\mathrm{i}}^2\) (where \(\mathrm{n_i} \) is number of electrons or holes in semiconductor when it is intrinsic form) |
| \(\mathrm{D}.\) | \(\mathrm{n}_{\mathrm{e}} \mathrm{n}_{\mathrm{h}} \geqslant \mathrm{n}_{\mathrm{i}}^2\) |
| \(\mathrm{E}.\) | The holes are not generated due to the donors |
| 1. | \(\mathrm{A,B,C}~\text{only}\) | 2. | \(\mathrm{A,C, D}~\text{only}\) |
| 3. | \(\mathrm{A,C,E}~\text{only}\) | 4. | \(\mathrm{A,B,E}~\text{only}\) |
Subtopic: Β Types of Semiconductors |
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In the circuit shown here, assuming threshold voltage of diode is negligible small, then voltage \(V_{AB}\) is correctly represented by :
| 1. | \(V_{AB}\) would be zero at all times | 2. |  |
| 3. |  |
4. |  |
Subtopic: Β Rectifier |
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