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Electronic Mechanic
Electronic Mechanic Set-1
Opto Electronics
23

Opto Electronics MCQ with Answers

23) How the light sensitive photo transistor enclosed inside a tight package is activated?

By the bias voltage to the photo transistor

By the external signal to the transistor

By IR light produced inside the package

By the light sensitive receiver inside

Answer is:

By IR light produced inside the package

Opto Electronics MCQ with Answers

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Related Opto Electronics MCQ with Answers

24) Which measuring instrument is used to check the working condition of a photo resistor (LDR)?

Oscilloscope

Voltmeter

Ohmmeter

Ammeter

Answer is:

Ohmmeter

Which measuring instrument is used to check the working condition of a photo resistor (LDR)?

25) Which electronic device inversely changes its resistance with the amount of light falling on it?

Photo diodes

Photo resistors

Photo transistors

Photo voltaic cells

Answer is:

Photo resistors

Which electronic device inversely changes its resistance with the amount of light falling on it?

26) What will happen if the photo resistor (LDR) is exposed to low level light condition?

Resistance will decrease to 10 Ohm

Resistance will decrease to 100 Ohm

Resistance will increase to 1 Kilo Ohm

Resistance will increase to around 1 Mega Ohm

Answer is:

Resistance will increase to around 1 Mega Ohm

What will happen if the photo resistor (LDR) is exposed to low level light condition?

Opto Electronics MCQ with Answers

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