Chapter 39

In the zener diode, at VZ, the breakdown voltage (A) a large change in voltage produces an insignificant change in the current. (B) a large change in current produces an insignificant change in the voltage. (C) a small change in current causes a small change in voltage. (D) a small change in current can cause a large change in the voltage.

The zener voltage of a zener diode is kept at a desired value by (A) adjustment the input voltage (B) adjustment the input current (C) by connecting an appropriate resistance in series (D) changing the level of doping

The emission of electrons from the host atoms due to the high electric field is known as (A) avalanche field emission (B) Breakdown field emission (C) zener field emission (D) internal field emission

To get a constant dc voltage from the dc unregulated output of a rectifier. We use (A) Oscillator (B) amplifier (C) zener diode (D) pacifier

Zener diodes are used as (A) amplifiers (B) voltage regulators (C) oscillators (D) half-wave rectifiers

For the same density of impurity atoms, Zener voltage is (A) same for both Ge and Si (B) higher for Ge than for \(\mathrm{Si}\) (C) higher for silicon than for germanium (D) none of the above

When p-n junction is reverse biased (A) no current flows (B) majority carriers move towards the junction (C) minority carriers move towards the junction (D) both majority and minority carriers move away from the junction

What constitutes the reverse current? (A) holes in both \(\mathrm{p}\) and \(\mathrm{n}\) type. (B) free electrons in both \(\mathrm{p}\) and \(\mathrm{n}\) type (C) free electrons in p-type and holes in n-type (D) holes in p-type and free electrons in n-type.

Avalanche breakdown in a semiconductor diode happens when (A) forward bias exceeds a certain value (B) forward current exceeds a certain value (C) reverse bias exceed a certain value (D) the potential barrier is reduced to zero