A Zener diode is used to obtain a constant voltage. If applied voltage \(\text V\) changes, then:
(\(\text V\) is more than Zener voltage)
1. | \(i_{1}\) and \(i_{2}\) change. |
2. | \(i_{2}\) and \(\text V_{0}\) change and \(i_{3}\) remains constant. |
3. | \(i_{2}\) and \(\text V_{0}\) don't change while \(i_{3}\) changes. |
4. | \(i_{3}\) and \(\text V_{0}\) don't change while \(i_{2}\) changes. |
Which one of the following represents an analog circuit diagram for OR gate?
1. | 2. | ||
3. | 4. |
Which of the following-junction is used unbiased?
1. Photo diode
2. LED
3. Zener diode
4. Solar cell
1. \(36~\text{mW}\)
2. \(12~\text{mW}\)
3. \(144~\text{mW}\)
4. \(72~\text{mW}\)
The \((I\text-V)\) characteristics of a \(\mathrm{p\text-n}\) junction diode is as shown. If \(R_1\) and \(R_2\) be the dynamic resistance of the \(\mathrm{p\text-n}\) junction when (i) a forward bias of \(1\) volt is applied and (ii) a forward bias of \(2\) volts is applied respectively, then \(\frac{R_1}{R_2}=?\)
1. \(160\)
2. \(16\)
3. \(1.6\)
4. \(0.16\)
Current \(I_1\) through the Zener diode shown in the circuit is:
1. Zero
2. \(0.6\) mA
3. \(0.2\) mA
4. \(0.8\) mA
1. | only if both inputs are zero. |
2. | \(1\). | if either or both inputs are
3. | \(1\). | only if both inputs are
4. | if any of the inputs is zero. |
1. | \(0,0\) | 2. | \(5~\text{mA},5~\text{mA}\) |
3. | \(5~\text{mA},0\) | 4. | \(0,5~\text{mA}\) |
The LED:
1. is reverse-biased.
2. is forward-biased.
3. can be made of \(\mathrm{GaAs}\).
4. both (2) & (3) are correct.
Logic gates \(X\) and \(Y\) have the truth tables shown below:
\(X\) | ||
\(P\) | \(Q\) | \(R\) |
\(0\) | \(0\) | \(0\) |
\(1\) | \(0\) | \(0\) |
\(0\) | \(1\) | \(0\) |
\(1\) | \(1\) | \(1\) |
\(Y\) | |
\(P\) | \(R\) |
\(0\) | \(1\) |
\(1\) | \(0\) |
When the output of \(X\) is connected to the input of \(Y\), the resulting combination is equivalent to a single:
1. NOT gate
2. OR gate
3. NAND gate
4. AND gate