OPTO ELECTRONICS - Practice Mode

1) What is the main application of photo resistor?

Voltage rectification Demodulation purpose Controls of street lighting systems To generate oscillations

Correct Answer: Controls of street lighting systems

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

Primary cells Rechargeable cells Light dependent resistor Voltage dependent resistor

Correct Answer: Light dependent resistor

3) 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

Correct Answer: By IR light produced inside the package

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

Oscilloscope Voltmeter Ohmmeter Ammeter

Correct Answer: Ohmmeter

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

Photo diodes Photo resistors Photo transistors Photo voltaic cells

Correct Answer: Photo resistors

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