The correct symbol for zener diode is:
1. | 2. | ||
3. | 4. |
Which of the following graphs may correctly represent the variation of current (l) with potential difference (V) across a zener diode?
1. | 2. | ||
3. | 4. |
An LED is constructed from a \(\mathrm{p\text{-}n}\) junction diode using \(\mathrm{GaAsP}\). The energy gap is \(1.9~\text{eV}\). The wavelength of the light emitted will be equal to:
1. \(10.4 \times 10^{-26} \text{m}\)
2. \(654~ \text{nm}\)
3. \(654~ \text{m}\)
4. \(654\times 10^{-11}~\text{m}\)
Zener breakdown will occur if:
1. impurity level is low.
2. impurity level is high.
3. impurity is less on the n-side.
4. impurity is less on the p-side.
In the given circuit, the power developed in 2 k resistor is:
1. 36 mW
2. 12 mW
3. 144 mW
4. 72 mW
The LED:
1. is reverse-biased.
2. is forward-biased.
3. can be made of GaAs.
4. both (2) & (3) are correct.
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. |
The given graph represents the V-I characteristic for a semiconductor device. Which of the following statement is correct?
1. | It is a V-I characteristic for a solar cell where point A represents open-circuit voltage and point B represents short-circuit current. |
2. | It is for a solar cell and points A and B represent open-circuit voltage and current respectively. |
3. | It is for a photodiode and points A and B represent open-circuit voltage and current respectively. |
4. | It is for a LED and points A and B represent open-circuit voltage and short circuit current respectively. |
A Zener diode is shown in the following circuit diagram. When the source voltage fluctuates such that , then:
1. all the current I1, I2 and I3 change.
2. only I1 and I2 change and I3 remains constant.
3. only I1 and I3 change and I2 remains constant.
4. all the currents remain constant.