How do PLCs enhance industrial automation efficiency and productivity?

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Here are the same multiple-choice questions along with their respective answers:

What does PLC stand for?
a) Programmable Logic Computer
b) Programmable Logic Circuit
c) Programmable Logic Controller
d) Programmable Linear Control
Answer: c) Programmable Logic Controller

Which programming language is commonly used in PLCs for creating ladder logic diagrams?
a) C++
b) Java
c) BASIC
d) Ladder Diagram
Answer: d) Ladder Diagram

Which component in a PLC is responsible for converting analog signals to digital and vice versa?
a) Input module
b) Output module
c) CPU
d) Analog I/O module
Answer: d) Analog I/O module

Which function is typically associated with the NO (Normally Open) contact in ladder logic?
a) Turns off the output
b) Turns on the output
c) Represents a closed circuit
d) Represents an open circuit
Answer: b) Turns on the output

What is the primary purpose of a PLC scan cycle?
a) To update the ladder logic
b) To execute the control program
c) To test the input/output modules
d) To perform diagnostics on the CPU
Answer: b) To execute the control program

Which type of memory in a PLC retains its data even after power loss?
a) RAM
b) ROM
c) EEPROM
d) Cache memory
Answer: c) EEPROM

Which communication protocol is commonly used for PLCs to communicate with other devices or systems?
a) USB
b) Bluetooth
c) Ethernet
d) Infrared
Answer: c) Ethernet

What is the function of a watchdog timer in a PLC?
a) Monitors the execution time of a program
b) Controls the input signals
c) Regulates the output voltage
d) Manages the CPU temperature
Answer: a) Monitors the execution time of a program

Which of the following is a discrete input device commonly connected to a PLC?
a) Thermocouple
b) Proximity sensor
c) Variable resistor
d) Encoder
Answer: b) Proximity sensor

In ladder logic programming, what does a coil represent?
a) Output device
b) Input device
c) Timer
d) Counter
Answer: a) Output device