What is the advantage of using an...

🔍 Key Concepts

• Auto-transformer starter operation and how it reduces starting current and voltage • Relationship between starting current, starting torque, and run-up time for induction motors • Typical advantages and disadvantages of auto-transformer starters compared with other starting methods (e.g., star-delta)

💭 Think About

• Think about what happens to current and torque in a motor when the supply voltage at start is reduced using a transformer tap • Consider which option describes a practical performance benefit (in terms of current surge and acceleration) rather than cost or a technical detail that is not unique to auto-transformers • Ask yourself which choice best matches the idea of a compromise between limiting inrush current and still allowing the motor to accelerate in reasonable time

✅ Before You Answer

• Verify which option mentions starting current (surge current) and run-up time/acceleration together • Eliminate options that focus only on cost or on features that are not specific to auto-transformer starters • Confirm that the correct statement should describe a reduced voltage at start and its impact on the motor’s starting behavior

What is the advantage of using an auto-transformer starter?

The starter enables the voltage to be disconnected while changing over to rated voltage.

The voltage is initially increased and then stepped down to rated voltage resulting in minimum heating of the coils.

It is cheaper as compared to other starters.

It gives an acceptable reduction in surge current without undue increase in run-up time.

🔍 Key Concepts

💭 Think About

✅ Before You Answer