Question 1

A synchronous motor may be brought up to synchronous speed with the use of a definite relay to excite the DC field.&#10;A)accelerating&#10;B)current&#10;C)time-delay&#10;D)overcurrent

Accepted Answer

A time-delay relay is used to excite the DC field of a synchronous motor to bring it up to synchronous speed, allowing for a controlled and delayed application of excitation to the motor.

Question 2

In the accompanying figure, the timing relay coil (TR) is energized with the secondary starter coil (F).

Accepted Answer

Without a specific figure to reference, it's impossible to determine the relationship between the timing relay coil (TR) and the secondary starter coil (F). The operation of these components depends on the specific wiring and control logic of the circuit they are part of.

Question 3

In the accompanying figure, the timer setting should be adjusted for the maximum time required to accelerate the motor to the point that it can reach the synchronous speed after contact TR closes.

Accepted Answer

The timer setting should be adjusted to allow the motor enough time to accelerate to synchronous speed after the contact TR closes, ensuring proper operation.

Question 4

If the attempt to synchronize the motor is not successful, the stop button is pressed and the starting cycle is .&#10;A)repeated&#10;B)prolonged&#10;C)redefined&#10;D)reset

Accepted Answer

When the attempt to synchronize a motor is not successful and the stop button is pressed, the starting cycle is typically repeated in an effort to successfully synchronize the motor on a subsequent attempt.

Deck 41: Timed Semiautomatic Synchronizing