Engineer Trainee Intern Interview Questions and Answers

RFID can be accessed using RFID readers which communicate with RFID tags wirelessly.

• RFID can be accessed using RFID readers which emit radio waves to communicate with RFID tags.

• RFID tags contain a unique identifier that can be read by the RFID reader.

• RFID technology is commonly used for tracking inventory, access control, and payment systems.

Biometric technology is used for identification and authentication based on unique biological traits.

• Used for security purposes to verify identity through fingerprints, facial recognition, iris scans, etc.

• Commonly used in access control systems, time and attendance tracking, and mobile devices.

• Helps prevent unauthorized access and fraud by ensuring only authorized individuals can access certain areas or information.

PIR sensor detects motion by measuring changes in infrared radiation levels.

• Passive Infrared (PIR) sensor detects motion by measuring infrared radiation emitted by objects in its field of view.

• When motion is detected, the sensor sends a signal to trigger an alarm or turn on lights.

• Commonly used in security systems, automatic lighting systems, and occupancy detection in buildings.