Shyam Sel & Power Electrical Engineer Interview Questions and Answers

RTD and TC are used for temperature measurement in various industries.

• RTD stands for Resistance Temperature Detector and TC stands for Thermocouple.

• RTD measures temperature by sensing the change in resistance of a metal wire as temperature changes.

• TC measures temperature by sensing the voltage generated by the junction of two dissimilar metals.

• RTD is more accurate and stable than TC, but TC is more rugged and can measu...read more

Variable frequency drives (VFDs) are used in ID fan motor and cooler motor.

• VFDs are used to control the speed of the motor and save energy.

• ID fan motor and cooler motor require different speeds at different times, which can be achieved through VFDs.

• VFDs can also protect the motor from damage due to overvoltage or undervoltage.

• Examples of VFDs include ABB ACS880, Siemens Sinamics G120, and Schneider Electric Altivar Pro

Synchronisation process of a plant involves matching the frequency, voltage, and phase angle of the incoming generator with the grid.

• Ensure the generator frequency matches the grid frequency (50Hz or 60Hz).

• Match the voltage levels of the generator with the grid.

• Adjust the phase angle of the generator to synchronize with the grid.

• Use synchronizing equipment like synchroscope or synchronizing lamps to ensure proper synch...read more

Alternator and transformer protection systems are essential for preventing damage and ensuring safe operation.

• Alternator protection systems typically include overcurrent, overvoltage, and reverse power protection to safeguard the alternator from damage.

• Transformer protection systems often involve differential protection, overcurrent protection, and temperature monitoring to prevent overheating and insulation breakdown.

• ...read more