Opto Electronics – 1 – 6

26. The light emitting diode :

(a) Usually made from metal oxide
(b) Is Used in reverse biased condition
(c) Gives light when temperature increases
(d) Gives light due to electron hole recombination

ANSWER

EXPLANATION

27. The numeric aperture is the fiber optic cable’s ability :

(a) To collect the light
(b) To diffract the light
(c) To reflect the light
(d) To refract the light

ANSWER

EXPLANATION

28. An LCD requires a power of about :

(a) 20 W
(b) 20 mW
(c) 20 μW
(d) 20 nW

ANSWER

EXPLANATION

29. The advantages of opto isolators is/are :

(a) Easy to interface with logic devices
(b) Capable of wide band signal transmission
(c) Problems such as noise transients, contact bounce is completely eliminated
(d) All of the above

ANSWER

EXPLANATION

30. To display the digit 8 in a seven-segment indicator :

(a) C must be lighted
(b) G must be off
(c) F must be on
(d) All segments must be lighted

ANSWER

EXPLANATION

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