Keltron Electronics Engineer Interview Questions and Answers

NPN and PNP sensors are types of bipolar junction transistors used in electronic circuits.

• NPN and PNP sensors are commonly used in industrial automation and control systems.

• NPN sensors use an N-type semiconductor sandwiched between two P-type semiconductors, while PNP sensors use a P-type semiconductor sandwiched between two N-type semiconductors.

• NPN sensors are active low devices, meaning they output a low voltage whe...read more

Single phase voltage refers to the voltage supplied by a single alternating current (AC) waveform.

• Single phase voltage is commonly used in residential and small commercial applications.

• It is characterized by a sinusoidal waveform with a single peak and trough per cycle.

• The voltage alternates between positive and negative values, providing power to electrical devices.

• In the United States, single phase voltage typically ...read more