Executive Instrumentation Interview Questions and Answers

Ladder diagram is a graphical representation of a motor control circuit using interlocks.

• Ladder diagram consists of rungs that represent the control circuit.

• Interlocks are used to prevent simultaneous operation of conflicting devices.

• Motor starter is used to start and stop the motor.

• Interlocks can be implemented using mechanical or electrical means.

• Example: A motor cannot be started if the door of the control panel is open.