Which type of DC generator is used in power shovel drives?

The correct answer is option 4.

Power shovel drives require high starting torque and stable voltage regulation under varying loads.

• Series generators provide high torque but poor voltage regulation, making them unsuitable.
• Shunt generators have good voltage regulation but low starting torque, which is not ideal.
• Cumulative compound generators combine the benefits of series and shunt characteristics, providing high starting torque and better voltage regulation, making them the best choice for power shovel drives.
• Differential compound generators have a weakening field under load, leading to poor stability.