What is the working principle of ultrasonic sensors?

• They emit sound waves and measure the time it takes for them to return.

• They detect infrared radiation.

• They use light to measure distances.

• They rely on heat changes to detect objects.

What are the advantages of ultrasonic sensors?

• Non-contact measurement and versatility.

• High cost and limited range.

• Only suitable for smooth surfaces.

• Requires physical contact with objects.

What is the formula for calculating distance using ultrasonic sensors?

• Distance = Speed * Time

• Distance = Time / Speed

• Distance = Speed + Time

• Distance = Speed - Time

What is the primary function of an IR sensor?

• To detect infrared radiation.

• To measure distances using sound.

• To convert light into electrical signals.

• To emit ultrasonic waves.

What are the types of IR sensors?

• Active and passive infrared sensors.

• Ultrasonic and laser sensors.

• Optical and thermal sensors.

• Mechanical and electrical sensors.

What is a photodiode?

• A device that converts light energy into electric current.

• A type of infrared sensor.

• A mechanical device for measuring distances.

• A type of ultrasonic sensor.

What is the conventional current flow direction in a diode under forward bias condition?

• From anode to cathode

• From cathode to anode

What are the types of photodiodes mentioned?

• PN Photodiode

• PIN Photodiode

• Avalanche Photodiode

• Schottky Photodiode

What is the main feature of a PIN photodiode compared to a PN photodiode?

• Higher sensitivity

• Lower capacitance

• Both A and B

What is the working principle of a photodiode?

• It generates current when light strikes

• It amplifies current

• It stores energy