JK Cement Deputy Manager Interview Questions and Answers for Experienced

Negative phase sequence in motor causes overheating and reduced efficiency.

• Negative phase sequence causes reverse rotation of the magnetic field in the motor.

• This leads to increased current and overheating of the motor.

• The motor also experiences reduced efficiency and torque.

• Examples of negative phase sequence include unbalanced three-phase power supply and faulty motor winding.

The type of brushes used in slipring motor depends on various factors such as motor design, operating conditions, and application requirements.

• The type of brushes used in slipring motor can be carbon, graphite, or metal graphite brushes.

• The current density of brushes depends on the motor design and operating conditions.

• The brush holder pressure or spring tension is typically set to ensure proper contact between the bru...read more