Tennessee Wastewater Operator Practice Exam

What is the purpose of a soft starter in blower operations?

1. To increase the blower's maximum capacity

2. To decrease in-rush electricity during start-up

3. To ensure continuous running of the blower

4. To regulate exhaust emissions

The correct answer is: To decrease in-rush electricity during start-up

A soft starter is a device used to control the starting and stopping of electric motors by reducing the initial torque and in-rush current during start-up. This is particularly important in blower operations, where the high starting current can cause voltage dips, overheating, and stress on the electrical infrastructure. By gradually ramping up motor speed, a soft starter minimizes these issues, which helps protect the motor and extend its lifespan, as well as reducing the overall strain on the electrical system. The other options do not accurately represent the primary function of a soft starter. While it does not increase the blower's maximum capacity or ensure continuous operation, it specifically focuses on controlling in-rush current. Similarly, while exhaust emissions may be a concern in blower operation, a soft starter does not serve to regulate these emissions directly.