Category: Electrical Engineering MCQs

What is the primary cause of magnetizing current in a transformer? A Voltage imbalance B High frequency C Magnetic flux

What is the main purpose of cooling in transformers? A Increase voltage B Reduce size C Prevent overheating D Increase

What is the main purpose of using a laminated core in transformers? A Lower resistance B Reduce losses C Improve

What does a transformer change in an electrical system? A Frequency B Voltage C Power D Current Explanation A transformer

What is the primary purpose of braking methods in electrical machines? A Increase speed B Stop quickly C Increase torque

How does an increase in temperature affect the resistance of an electrical machine’s windings? A Fluctuates B Increases resistance C

What is the primary function of the commutator in a DC motor? A Reverse current direction B Increase torque C

What does voltage regulation measure in an electrical machine? A Load current B Torque change C Speed variation D Voltage

What is the primary purpose of using testing methods for electrical machines? A To increase speed B To reduce losses

What does the efficiency of an electrical machine depend on? A Power losses B Torque C Voltage D Speed Explanation