Course 59983

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Referring to the figure below, when the stop-button is pressed, ____.

motor # 2 stops

❌

motor #1 stops, but motor #2 will continue to run for 5 seconds

✅

both motor #1 and motor # 2 stop

❌

motor # 1 stops

❌

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Refer to the circuit shown above. What is the purpose of the dashed line drawn between coil symbols F and R?

It indicates a mechanical interlock. When one contactor is energized, the other is mechanically prevented from operating.

✅

It indicates that the two coils are electrically connected. They will both energize at the same time.

❌

It indicates that the two contactors are located out of sight of each other.

❌

It indicates that the contactors are mechanically connected so that both are forced to operate at the same time.

❌

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Referring to the figure below, when the push-pull operator is ____.

pressed, the motor starter M is de-energized

❌

pulled, the motor starter M is de-energized

❌

pulled, the motor starter M is energized

✅

pressed, the motor starter CR is energized

❌

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Refer to the circuit shown above. Assume that the coil of TR4 timer is open. Explain the action of the circuit when the start button is pressed.

Motor 1 will starts immediately; 5 seconds later motor 2 starts; and motor 3 never starts. When the stop button is pressed, both motors 1 and 2 stop immediately.

❌

Motor 1 will start immediately; 5 seconds later motor 2 starts; and motor 3 never starts. When the stop button is pressed, motor 2 stops immediately; 5 seconds later motor 1 stops.

✅

The motors will start in sequence from 1 to 3 with a delay of 5 seconds between the starting of motors 2 and 3. When the stop button is pressed, motors 2 and 3 stop immediately; 5 seconds later motor 1 stops.

❌

Motors 1 and 2 start immediately; after a delay of 5 seconds, motor 3 starts. When the stop button is pressed, motor 1 and 2 stop immediately; 5 seconds later motor 3 stops.

❌

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