1. In zener diode, zener voltage depend on;
(A) Voltage
(B) Current
(C) Doping level
(D) Impedance
2. If the load resistance decreases in a Zener regulator, the Zener current;
(A) Increases
(B) Decreases
(C) Remains constant
(D) Both a & b
3. A thyristor is a semiconductor device which has;
(A) 2 layers
(B) 3 layers
(C) 2 PN junctions
(D) 3 PN junctions
4. A light emitting diode emits light when;
(A) Breakdown
(B) Reverse biased
(C) Un-biased
(D) Forward biased
5. Uni junction transistor have terminals;
(A) Base, Collector, Emitter
(B) Base1, Base2, Emitter
(C) Gate, Drain, Source
(D) Gate, Anode, Cathode
6. Tunnel diode is also called;
(A) Esaki diode
(B) Shockley diode
(C) LASER diode
(D) PIN diode
7. If there is no light on photodiode, a very small current flows termed as;
(A) Light current
(B) Bright current
(C) Forward current
(D) Dark current
8. The characteristic of negative resistance is not found in device;
(A) UJT
(B) Tunnel diode
(C) Diac
(D) Resistor
9. Following is a light sensitive device;
(A) Tunnel diode
(B) Zener diode
(C) LASCR
(D) TRIAC
10. In an optocoupler, input device is a;
(A) Photo diode
(B) LASCR
(C) Photo transistor
(D) LED
11. The output waveform of a relaxation oscillator is;
(A) Non-Sinusoidal
(B) Cosine
(C) Sine
(D) None of these
12. The value of intrinsic stand-off ratio in a UJT is
(A) 1 to 5
(B) Less than 1
(C) 2 to 4
(D) Greater than 10
13. Two thyristors which conduct in both directions;
(A) SCR & DIAC
(B) SCR & TRIAC
(C) Shockley & SCS
(D) DIAC & TRIAC
14. In LCD, the organic compound is used which is in the form;
(A) Solid
(B) Liquid
(C) Solid
(D) All of these