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Electronic Mechanic
Electronic Mechanic Set-1
Opto Electronics
21

Opto Electronics MCQ with Answers

21) What is the main application of photo resistor?

Voltage rectification

Demodulation purpose

Controls of street lighting systems

To generate oscillations

Answer is:

Controls of street lighting systems

What is the main application of photo resistor?

Opto Electronics MCQ with Answers

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Related Opto Electronics MCQ with Answers

22) Which purpose the cadmium sulfide cells (CDS cells) are used?

Primary cells

Rechargeable cells

Light dependent resistor

Voltage dependent resistor

Answer is:

Light dependent resistor

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

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?

Opto Electronics MCQ with Answers

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