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Q. No.The following diagram shows a Zener diode as a voltage regulator. The Zener diode is rated at \(V_z = 5~\text{V}\) and the desired current in a load is \(5~\text{mA}\). The unregulated voltage source can supply upto \(25~\text{V}\). Considering the Zener diode can withstand four times of the load current, the value of resistor \(R_S\) (shown in circuit) should be: (in \(\Omega\))
1. \(4000\)
2. \(10\)
3. \(800\)
4. \(1000\)
Subtopic: Β Applications of PN junction |
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The correct truth table for the given input data of the following logic gate is:
1.
2.
3.
4.
1.
| Input | Output | |||
| \(A\) | \(B\) | \(C\) | \(D\) | \(Y\) |
| \(1\) | \(1\) | \(0\) | \(1\) | \(1\) |
| \(0\) | \(0\) | \(1\) | \(1\) | \(0\) |
| \(1\) | \(0\) | \(1\) | \(0\) | \(1\) |
| \(1\) | \(1\) | \(1\) | \(1\) | \(0\) |
2.
| Input | Output | |||
| \(A\) | \(B\) | \(C\) | \(D\) | \(Y\) |
| \(1\) | \(1\) | \(0\) | \(1\) | \(0\) |
| \(0\) | \(0\) | \(1\) | \(1\) | \(0\) |
| \(1\) | \(0\) | \(1\) | \(0\) | \(1\) |
| \(1\) | \(1\) | \(1\) | \(1\) | \(1\) |
3.
| Input | Output | |||
| \(A\) | \(B\) | \(C\) | \(D\) | \(Y\) |
| \(1\) | \(1\) | \(0\) | \(1\) | \(1\) |
| \(0\) | \(0\) | \(1\) | \(1\) | \(0\) |
| \(1\) | \(0\) | \(1\) | \(0\) | \(0\) |
| \(1\) | \(1\) | \(1\) | \(1\) | \(1\) |
4.
| Input | Output | |||
| \(A\) | \(B\) | \(C\) | \(D\) | \(Y\) |
| \(1\) | \(1\) | \(0\) | \(1\) | \(0\) |
| \(0\) | \(0\) | \(1\) | \(1\) | \(1\) |
| \(1\) | \(0\) | \(1\) | \(0\) | \(1\) |
| \(1\) | \(1\) | \(1\) | \(1\) | \(1\) |
Subtopic: Β Logic gates |
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Identify the correct truth table of the given logical circuit.
| 1. |
|
2. |
|
||||||||||||||||||||||||||||||
| 3. |
|
4. |
|
Subtopic: Β Logic gates |
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The given circuit works as:
1. \(\mathrm{AND}~\) gate
2. \(\mathrm{NOR}~\) gate
3. \(\mathrm{NAND}~\) gate
4. \(\mathrm{OR}~\) gate
1. \(\mathrm{AND}~\) gate
2. \(\mathrm{NOR}~\) gate
3. \(\mathrm{NAND}~\) gate
4. \(\mathrm{OR}~\) gate
Subtopic: Β Logic gates |
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The charge stored by the capacitor \(C~\) in the given circuit in the steady state is: (in \(\mu\text{C}~\))
1. \(12.5\)
2. \(10\)
3. \(7.5\)
4. \(5\)
1. \(12.5\)
2. \(10\)
3. \(7.5\)
4. \(5\)
Subtopic: Β PN junction |
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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. \(130\)
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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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 |
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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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