Opto Electronics – 4

4. In a phototransistor, the base current is :

(a) Set by a bias voltage
(b) Directly proportional to light
(c) Inversely proportional to light
(d) Square to light intensity

Answer

Answer : (b)

Explanation

Explanation : No answer description available for this question. Let us discuss.

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Opto Electronics - 35
Opto Electronics » Exercise - 135. A photo-diode is normally : (a) forward-biased (b) reverse-biased (c) Neither forward nor reverse biased (d) Emitting light
Tags: opto, electronics, exercise, light, engineering
Opto Electronics - 31
Opto Electronics » Exercise - 131. A photo-diode is normally : (a) forward-biased (b) reverse-biased (c) Neither forward nor reverse biased (d) Emitting light
Tags: opto, electronics, exercise, light, engineering
Transistors - 66
Transistors » Exercise - 2 66. In a transistor, the base current is about ........ of emitter current. (a) 25% (b) 20% (c) 35% (d) 5%
Tags: current, exercise, base, electronics, engineering
Opto Electronics - 36
Opto Electronics » Exercise - 136. When the light increases, the reverse current in a photo-diode : (a) increases (b) decreases (c) is unaffected (d) none of the above
Tags: opto, electronics, exercise, light, current, engineering
Opto Electronics - 32
Opto Electronics » Exercise - 132. When the light increases, the reverse current in a photo-diode : (a) increases (b) decreases (c) is unaffected (d) none of the above
Tags: opto, electronics, exercise, light, current, engineering

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