OPTO ELECTRONICS - Practice Mode

1) Which is the combination of photo transistor?

LASER diode and pin diode Photo transistor and DIAC Photo diode and transistor Photo resistor and TRIAC

Correct Answer: Photo diode and transistor

2) What is the advantage of photo transistors over photo diodes?

Considerably lower sensitivity Limit voltage handling capacity Considerable greater sensitivity Vulnerable to electrical sources

Correct Answer: Considerable greater sensitivity

3) What is the use of photo transistor?

Used in comparator circuit Used as light controlled switch Used as oscillator Used as demodulator

Correct Answer: Used as light controlled switch

4) What is the drawbacks of LDR?

More sensitive Available different sizes and specifications Cannot be used to determine precise light levels Made of low resistance material with few holes

Correct Answer: Cannot be used to determine precise light levels

5) Which material is used to make photo resistors (LDR)?

Silicon Germanium Aluminium Cadmium sulfide

Correct Answer: Cadmium sulfide

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