Mehali Papers Electrical Engineer Interview Questions, Process, and Tips

AC voltage and frequency are key parameters in electrical engineering, determining the power supply characteristics.

• AC voltage is the amplitude of the alternating current signal, measured in volts.

• Frequency refers to the number of cycles per second in the AC signal, measured in Hertz (Hz).

• Standard AC voltage in most countries is around 220-240V at a frequency of 50-60Hz.

• Variations in AC voltage and frequency can affect...read more

DC voltage is a constant voltage level, while frequency refers to the number of cycles per second in an alternating current.

• DC voltage is a constant voltage level that does not change over time.

• Frequency refers to the number of cycles per second in an alternating current.

• DC voltage is typically used in batteries and power supplies.

• Frequency is measured in Hertz (Hz).

AC motors run on alternating current while DC motors run on direct current.

• AC motors change the direction of current flow periodically, while DC motors maintain a constant direction of current flow

• AC motors are commonly used in household appliances and industrial applications

• DC motors are often used in battery-operated devices like toys and electric vehicles

Transformers are electrical devices that transfer electrical energy between two or more circuits through electromagnetic induction.

• Transformers consist of two coils of wire, known as the primary and secondary coils, which are magnetically coupled but electrically isolated.

• They can step up or step down voltage levels depending on the number of turns in each coil.

• Examples of transformers include power transformers used i...read more