Aux 2 Unit 4 Quiz 1

Correct Answer:
A) All three phases share a common neutral point

Explanation:
In a Star connection, each phase is connected to a common central point (neutral), creating a star shape, with each winding extending outward.

Correct Answer:
C) Line voltage is √3 times the phase voltage

Explanation:
In a Star connection, the line voltage is √3 times the phase voltage because the line voltage is measured across two phases, while phase voltage is measured from the phase to the neutral.

Correct Answer:
A) Phase voltage equals line voltage

Explanation:
In a Delta connection, the phase voltage is the same as the line voltage because each winding is directly connected between two lines.

Correct Answer:
A) Connect terminals U1 to V2, V1 to W2, and W1 to U2

Explanation:
In a Delta connection, each phase is connected end-to-start with the next phase to create a closed loop. This configuration ensures that all windings are connected across the power supply phases.

Correct Answer:
C) Both connections provide the same speed

Explanation:
The connection type (Delta or Star) affects the torque and current characteristics of the motor but not the synchronous speed, which is determined by the supply frequency and the number of poles in the motor.

Correct Answer:
B) The end of one phase is connected to the start of the next, forming a closed loop

Explanation:
In a Delta connection, the phases are connected in a closed loop where the end of each winding is connected to the start of the next, forming a triangle or delta shape.

Correct Answer:
B) Higher starting torque

Explanation:
A Delta connection allows the motor to operate with full line voltage across each winding, resulting in higher starting torque and power output compared to a Star connection.