Efftronics Systems Junior Engineer Electrical Interview Questions and Answers

The main types of electrical currents are AC and DC.

• AC (alternating current) changes direction periodically and is used in household electricity.

• DC (direct current) flows in one direction and is used in batteries and electronic devices.

• Other types of currents include pulsed DC and sinusoidal AC.

• The choice of current type depends on the application and the equipment being used.

Transistors are electronic devices used to amplify or switch electronic signals and power. They are essential components in various applications.

• Amplification of weak signals in audio and radio frequency systems

• Switching and control of electronic circuits in computers and digital devices

• Power regulation and control in power supplies and motor control systems

• Signal processing and amplification in communication systems

• Me...read more

A string of transistors in series is used to increase the overall voltage gain of a circuit.

• Transistors in series amplify the input signal sequentially, resulting in a higher overall gain.

• This configuration is commonly used in amplifiers and signal processing circuits.

• For example, a cascade amplifier consists of multiple stages of transistors in series to achieve high gain.

• Each transistor in the series contributes to t

Transistors are primarily used to amplify and switch electric currents in electronic devices.

• Transistors are essential components in electronic circuits.

• They can amplify weak signals to a higher power level.

• Transistors can also act as switches, controlling the flow of current.

• They are used in various applications such as amplifiers, radios, computers, and televisions.

• Examples of transistors include bipolar junction tra...read more

Power factor is a measure of how effectively electrical power is being used in a circuit.

• Power factor is the ratio of real power (in watts) to apparent power (in volt-amperes)

• It indicates the efficiency of electrical power consumption

• A power factor of 1 means all the power is being used effectively, while a power factor less than 1 indicates wastage

• Inductive loads like motors have a lagging power factor, while capaciti...read more