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Opto Electronics – 1 – 2

6. A laser diode can be fabricated using :

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

ANSWER

EXPLANATION

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

EXPLANATION

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

EXPLANATION

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

EXPLANATION

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

EXPLANATION

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