Isgec Heavy Engineering Electrical Technician Interview Questions and Answers for Experienced

There are two types of current: direct current (DC) and alternating current (AC).

• Direct current (DC) flows in one direction only, typically produced by batteries or power supplies.

• Alternating current (AC) periodically changes direction, commonly used in household electrical systems.

• DC is used in electronic devices like computers and cell phones, while AC powers appliances and lighting.

• Examples of DC include car batteri...read more

Voltage value L-L is the voltage between two phases, while L-N is the voltage between a phase and neutral.

• Voltage value L-L is also known as line-to-line voltage.

• Voltage value L-N is also known as line-to-neutral voltage.

• L-L voltage is typically higher than L-N voltage in a three-phase system.

• For example, in a 120/208V three-phase system, the L-L voltage is 208V, while the L-N voltage is 120V.

A step-up transformer increases voltage while a step-down transformer decreases voltage.

• Step-up transformer increases voltage from primary to secondary winding

• Step-down transformer decreases voltage from primary to secondary winding

• Step-up transformers are used in power transmission to increase voltage for long-distance transmission

• Step-down transformers are used in power distribution to decrease voltage for consumer u...read more