Examlex
The following data are in the tables Employee (primary key: Empno) and Department (primary key: Deptno) . The questions refer to row numbers of this table. The first row of each table is row #1. Empdeptno in table Employee is a foreign key that refers to Deptno in the table Department. Deptmgr in the table Department is a foreign key that refers to Empno in the table Employee.
-Which of the following statements is true?
Master Control Relay Instruction
An alternate definition for MCR Instructions, specifically highlighting its role in controlling the execution flow in PLC programs.
Disconnect Switch
A Disconnect Switch is an electrical switch designed to completely cut off electrical power from part of a circuit or the entire system for safety or maintenance purposes.
Motor Starter Seal-In Contact
A contact in an electric motor starter circuit that maintains the circuit closed, keeping the motor running after the start button is released.
Programmed Contact
A virtual representation of a physical switch or condition used within PLC or relay logic to control the flow of a program.
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