Special Diodes and Optoelectronic Devices Objective MCQ Quiz Questions - 1

Question: 1

The minimum energy of a photon required for intrinsic excitation is equal to

(A) Fermi energy

(B) Forbidden gap energy

(C) Energy of top of valence band

(D) Energy of bottom of conduction band

Question: 2

In a Zener diode

(A) Only the P-region is heavily doped

(B) Only the N-region is heavily doped

(C) Both P and N regions are heavily doped

(D) Both P and N region are lightly doped

Question: 3

Optocoupler is used to

(A) Isolate gating circuitry from power lines

(B) Regulate gate signal

(C) Protect IGBTs against dv/dt

(D) Reduces SCR turn-off time

Question: 4

A solar cell is actually at a device which utilises

(A) Photoresistive effect

(B) Photoemissive effect

(C) Photoconductive effect

(D) Photovoltaic effect

Question: 5

A device having characteristics very close to that of an ideal voltage source is

(A) FET

(B) Transistor

(C) Zener diode

(D) Vacuum diodes