Opto Electronics – 1 – 2

6. A laser diode can be fabricated using :

(a) Germanium
(b) Silicon
(c) Gallium arsenide
(d) Gallium phosphide

Answer
Answer : (c)

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

7. The general condition for a phototransistor is :

(a) Common base configuration
(b) Common collector configuration
(c) Common emitter configuration
(d) Darlington-pair configuration

Answer
Answer : (c)

Explanation
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8. The power consumption of an LCD as compared to an LED is :

(a) same
(b) more
(c) less
(d) can’t be defined

Answer
Answer : (c)

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

9. When a photodiode is reverse biased, and kept in a dark room, the current flowing through the device corresponds to :

(a) Zero current
(b) Maximum current the device can hold
(c) Normal current that flows through the device
(d) Reverse saturation current

Answer
Answer : (d)

Explanation
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10. Emission of light in an LED results due to :

(a) Emission of electrons
(b) Photovoltaic effect
(c) Generation of electromagnetic radiation
(d) Conversion of heat to electrical energy

Answer
Answer : (a)

Explanation
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