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PLC MCQ – Top 10 Programmable Logic Controller MCQs

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How much you know about PLCs? Test your PLC knowledge from these Top 10 Programmable Logic Controller MCQs

Programmable logic controller or PLC sometimes also referred to as a programmable controller is a type of industrial computer that is available in various sizes. Given below are the top 10 basic MCQs on Programmable logic controllers.

The most popular language for PLCs is

The most popular language for PLCs is:

  1. Ladder diagram
  2. C++
  3. OOP+
  4. VHDL

Correct answer: 1. Ladder diagram

Very often relays and valves are connected to

Very often relays and valves are connected to:

  1. Input modules
  2. Output modules
  3. Any of these

Correct answer: 2. Output modules

Input modules receive data from devices such as switches and push buttons and pass to output modules. The output modules are connected to relays and valves to whom they send the data.

SCADA stands for

SCADA stands for:

  1. Supervisory Computer And Data Analog
  2. Supervisory Computer And Data Acquisition
  3. Supervisory Control And Data Acquisition
  4. Supervisory Control And Data Aspiration

Correct answer: 3. Supervisory Control And Data Acquisition

PLC MCQ#4

Statement 1: The instance data block is assigned to logical block
Statement 2: Shared data block is never assigned to logical block

  1. Both statements are incorrect
  2. Statement 1 is correct, 2 is wrong
  3. Statement 2 is correct, 1 is wrong
  4. Both statements are correct

Correct answer: 4. Both statements are correct

The instance data block is assigned to a logical block while the shared data block is never assigned to a logical block.

Normally open contacts are open when

Normally open contacts are open when:

  1. When Input is not energized
  2. When the input is energized
  3. When input is higher than 20 volts
  4. None of these

Correct answer: 1. When Input is not energized

Typical examples of inputs to SCADA are

Typical examples of inputs to SCADA are:

  1. Switches
  2. LDVT
  3. Potentiometer
  4. All of these

Correct answer: 4. All of these

NOR has output 1 when

NOR has output 1 when:

  1. Both inputs are 1
  2. First input is 1, Second is 0
  3. First input is 0, Second is 1
  4. Both inputs are 0

Correct answer: 1. Both inputs are 1

BOOL tag in Programmable logic controller

BOOL tag in Programmable logic controller:

  1. Represents timer memory
  2. Is used for PID control functons
  3. Holds true or false values
  4. None of these

Correct answer: 3. Holds true or false values

PLCs that have a fixed amount of I/O capability built into the unit are known as

PLCs that have a fixed amount of I/O capability built into the unit are known as:

  1. Rack PLCs
  2. Monolithic PLCs
  3. Modular PLCs
  4. None of these

Correct answer: 2. Monolithic PLCs

Colored contact in PLC ladder diagram indicates

Colored contact in PLC ladder diagram indicates:

  1. Closed contact
  2. Open contact
  3. Any of these
  4. None of these

Correct answer: 1. Closed contact

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