Industrial Engineer Trainee Interview Questions and Answers

Cables used in power transmission are typically high-voltage power cables made of copper or aluminum.

• High-voltage power cables are used for long-distance transmission of electricity.

• Copper and aluminum are the most commonly used materials for power cables.

• Cables may be insulated with materials such as rubber, plastic, or oil.

• Examples of power cables include overhead transmission lines, underground cables, and submarine cables.

The main types of electrical current are AC and DC.

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

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

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

• AC and DC can be converted into each other using devices like transformers and rectifiers.

Transformers work on the principle of electromagnetic induction to transfer electrical energy from one circuit to another.

• Transformers have two coils of wire, a primary coil and a secondary coil, wrapped around a magnetic core.

• When an alternating current flows through the primary coil, it creates a magnetic field that induces a voltage in the secondary coil.

• The voltage induced in the secondary coil is proportional to the number of turns in the coil and the rate of change of t...read more

Silicagel is used in transformers to absorb moisture and prevent damage to the insulation.

• Silicagel is a desiccant that absorbs moisture from the air.

• Moisture can cause damage to the insulation in transformers.

• Silicagel helps to prevent this damage by absorbing moisture.

• It is important to keep transformers dry to ensure their proper functioning.

• Silicagel is also used in other electrical equipment, such as circuit breakers and switchgear.