Opto Electronics – 1 – 3

11. The combined package of LED and a photodiode is known as :

(a) Optocouplers
(b) Opto isolator
(c) Optically coupled isolator
(d) All of the above

Answer
Answer : (d)

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

12. Germanium photodiodes have dark currents in the order of :

(a) 5 mA
(b) 10 mA
(c) 25 mA
(d) 10 A

Answer
Answer : (b)

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

13. When a phototransistor is reverse biased, is kept in dark condition, the current flowing through the device corresponds to :

(a) Zero current
(b) Reverse saturation current
(c) Maximum flow of device current
(d) Minimum flow of device current

Answer
Answer : (b)

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

14. The colour of an LED can be changed by :

(a) Using different band gap semiconductors
(b) Varying the doping level of the semiconductor
(c) Increasing applied voltage
(d) None of the above

Answer
Answer : (b)

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

15. LEDs fabricated from gallium arsenide emit radiation in the :

(a) Visible range
(b) Infrared region
(c) Ultraviolet region
(d) Ultrasonic region

Answer
Answer : (b)

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

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