Semiconductor Physics – Exercise – 1

46. In general, LEDs operate at voltage levels from ________ V to ________ V.

(a) 1.0, 3.0
(b) 1.7, 3.3
(c) 0.5, 4.0
(d) None of the above

Answer
Answer : (b)
Explanation
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47. Calculate the temperature coefficient in %/° C of a 10-V nominal Zener diode at 25° C if the nominal voltage is 10.2 V at 100° C.

(a) 0.0238
(b) 0.0251
(c) 0.0267
(d) 0.0321

Answer
Answer : (c)
Explanation
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48. In which of the following color(s) is (are) LEDs presently available?

(a) Yellow
(b) White
(c) Orange
(d) All of the above

Answer
Answer : (d)
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49. The forward characteristics curve of a diode grows in ________ form.

(a) linear
(b) exponential
(c) logarithmic
(d) sinusoidal

Answer
Answer : (b)
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50. Ge and Si have a(n) ________ coefficient in forward bias.

(a) positive temperature
(b) negative temperature
(c) absolute temperature
(d) temperature free

Answer
Answer : (b)
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