Aux 2 Unit 4 Quiz 2

Correct Answer:
C) It increases to full line voltage

Explanation:
In DELTA configuration, the phase voltage equals the line voltage, which increases the power output and allows the motor to deliver full torque.

Correct Answer:
B) When the motor needs to start with reduced current and torque

Explanation:
A STAR/DELTA starter is used to start large induction motors with reduced starting current and torque, minimizing the stress on electrical components and preventing a large voltage drop in the supply network.

Correct Answer:
B) To provide full line voltage across each winding for maximum power and torque

Explanation:
Once the motor reaches a sufficient speed, switching to DELTA configuration allows full line voltage across each winding, enabling the motor to operate at its rated power and torque for normal operation.

Correct Answer:
B) It creates high starting current and torque, which could damage electrical systems

Explanation:
A DOL starter connects the motor directly to the supply voltage, causing high inrush current and torque that may damage electrical infrastructure or the motor itself, making a STAR/DELTA starter more suitable for larger motors.

Correct Answer:
B) A high-capacity industrial pump

Explanation:
High-capacity motors, such as those used for industrial pumps, require a STAR/DELTA starter to manage the high inrush current and torque during startup and avoid electrical disturbances in the supply network.

Correct Answer:
B) To reduce the starting current and torque, protecting the electrical network

Explanation:
The STAR configuration lowers the phase voltage across each winding, which reduces the starting current and torque, protecting both the motor and the supply network from high inrush currents.

Correct Answer:
B) It starts the motor in STAR configuration for reduced voltage, then switches to DELTA for full voltage

Explanation:
A STAR/DELTA starter initially connects the motor windings in a STAR configuration to reduce the starting current and torque. After the motor reaches a certain speed, it switches to DELTA configuration to provide full voltage and enable full power output.