Il&fs Tamil Nadu Power Company Interview Questions and Answers

Breakers are electrical switches that protect circuits from overloading and short circuits.

• Circuit Breaker - protects circuits from overloading and short circuits

• Ground Fault Circuit Interrupter (GFCI) - protects against electrical shock in wet areas

• Arc Fault Circuit Interrupter (AFCI) - protects against electrical fires caused by arcing

• Main Breaker - controls power to the entire electrical panel

• Miniature Circuit Breaker (MCB) - protects individual circuits from overloading a...read more

Starters are used to control the starting current of motors.

• Starters are used to limit the inrush current during motor starting.

• They protect the motor from damage due to high starting current.

• Types of starters include direct-on-line, star-delta, and soft starters.

• Starters are commonly used in industrial and commercial applications.

• Examples of applications include pumps, fans, and conveyor belts.

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Transformers are sized based on load requirements and voltage levels.

• Determine the load requirements of the system

• Calculate the required kVA rating based on the load requirements

• Determine the voltage levels of the system

• Select a transformer with a kVA rating and voltage levels that meet the requirements

• Consider factors such as efficiency, temperature rise, and impedance when selecting a transformer

Voltage drop is the reduction in voltage that occurs as electricity flows through a circuit due to resistance.

• Calculate the total resistance of the circuit

• Determine the current flowing through the circuit

• Multiply the current by the total resistance to get the voltage drop

• Use Ohm's Law (V=IR) to calculate voltage drop across individual components

• Consider using voltage drop calculators or tables for more complex circuits

Choose cable based on voltage, current, temperature, environment and application.

• Determine voltage and current requirements

• Consider temperature range and environmental conditions

• Choose cable type based on application (e.g. power, data, signal)

• Select appropriate conductor material (e.g. copper, aluminum)

• Check for any regulatory requirements or standards (e.g. NEC, UL)

• Examples: THHN for indoor power, Cat6 for data transmission, coaxial for RF signals

IEC codes and standards are international standards for electrical engineering.

• IEC stands for International Electrotechnical Commission

• IEC codes and standards ensure safety, reliability, and compatibility of electrical systems and equipment

• Examples of IEC standards include IEC 60601 for medical electrical equipment and IEC 61850 for communication networks and systems in substations