Refer to the circuit shown above. Assume that the coil of TR4 timer is ope...

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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.

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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.

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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.

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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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