Pasupati Acrylon Electrical Maintenance Engineer Interview Questions and Answers

The excitation system rating in kW reflects its power output capacity for effective generator operation.

• Excitation systems provide the necessary field current to the rotor of synchronous machines.

• The kW rating indicates the real power required to maintain the magnetic field.

• For example, a generator with a 200 kW excitation system can support a generator output of up to 200 kW.

• This rating helps in sizing the excitation ...read more

Transformers are rated in kVA to account for both active and reactive power, ensuring proper sizing for various loads.

• Transformers handle both active (kW) and reactive power (kVAR), making kVA a more comprehensive measure.

• Using kVA allows for the consideration of power factor, which varies with different loads.

• For example, a transformer rated at 100 kVA can support a load of 100 kW at a power factor of 1 (purely resist...read more

Synchronizing a generator without matching parameters can lead to severe mechanical and electrical issues.

• Phase mismatch can cause large circulating currents, potentially damaging equipment.

• Frequency differences can lead to mechanical stress on the generator and connected systems.

• Voltage mismatch may result in arcing at the circuit breaker contacts during synchronization.

• Example: If a generator is running at 60 Hz and ...read more