#4 Top 50 PLC and SCADA MCQ

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Important 50 Multiple Choice Question based on PLC and SCADA


Question 1: What is the full form of SCADA?

  • Supervisory Control and Document Acquisition
  • Supervisory Control and Data Acquisition
  • Supervisory Column and Data Assessment
  • Supervisory Column and Data Assessment

Answer: Supervisory Control and Data Acquisition

Question 2: DCS is a ______

  • Distributed Control System
  • Data Control System
  • Data Column System
  • Distributed Column System

Answer: Distributed Control System

Question 3 The control in SCADA is _____________

  • Online control
  • Direct control
  • Supervisory control
  • Automatic control

Answer: Supervisory control

Question 4 What is SCADA?

  • Software
  • Process
  • System
  • Hardware

Answer: Process

Question 5 Which of the following is not the component of a SCADA system?

  • Database server
  • I/O system
  • PLC controller
  • Sparger controller

Answer: Sparger controller

Question 6 When did the SCADA start?

  • 1980s
  • 1990s
  • 1970s
  • 1960s

Answer:1960s

Question 7 When did Windows become the world standard operating system?

  • 1980s
  • 1990s
  • 1970s
  • 1960s

Answer: 1990s

Question 8 How many levels are present in a complex SCADA system?

  • 3 – levels
  • 5 – levels
  • 4 – levels
  • 6 – levels

Answer: 4 – levels

Question 9 What is the full form of RAID

  • Redundant Array of Independent Drives
  • Redundant Array of Inexpensive Disks
  • Redundant Array of Independent Disks
  • All of the above

Answer: All of the above

Question 10 Which of the following is used for centralized network databases?

  • RAID 2
  • RAID 5
  • RAID 1
  • RAID 2

Answer: RAID 5

Question 11 Which of the following is the heart of a SCADA system?

  • PLC
  • HMI
  • Alarm task
  • I/O task

Answer: I/O task

Question 12 Which of the following is an example of the SCADA system?

  • Emerson Delta V
  • Honeywell Plant Scape
  • Yokogawa CENTUM
  • Power Studio Deluxe

Answer: Power Studio Deluxe

Question 13 What does NC stands for?

  • New Configuration
  • Normally Close
  • Normal Classes
  • Never Closing

Answer: Normally Close

Question 14 What is nominal DC voltage given to PLC?

  • +10V
  • +24V
  • +5V
  • +12V

Answer: +5V

Question 15 In which of the following is a PLC Programming tool.

  • RS Logix 500
  • RS view 32
  • Keil u vision
  • Core Vision AVR

Answer: RS Logix 500

Question 16 Among following which one is a PLC Programming Language

  • Assembly
  • Ladder Logic
  • Java
  • HTML

Answer: Ladder Logic

Question 17 In which of the following is the SCADA Software?

  • OrCAD
  • RS View32
  • Keil u vision
  • Porteous

Answer: RS View32

Question 18 Ladder logic programming consists primarily of:

  • Virtual relay contacts and coils
  • Logic gate symbols with connecting lines
  • Function blocks with connecting lines
  • Text-based code
  • Hieroglyphics

Answer: Virtual relay contacts and coils

Question 19 Examine-on instruction in PLC language is symbolically represented by what shape?

  • -] [-
  • -( )-
  • -]/[-
  • None of these

Answer: -] [-

Question 20 The symbol -(L)- represent what instruction in the PLC language?

  • OUT output unlatch instruction.
  • OTL output latch instruction
  • Examine off instruction.
  • Output energize instruction

Answer: OTL output latch instruction

Question 21 In a PLC, the scan time refers to the amount of time in which …..

  • The technician enters the program
  • Timers and counters are indexed by
  • One “rung” of ladder logic takes to complete
  • The entire program takes to execute
  • Transmitted data communications must finish

Answer: The entire program takes to execute

Question 22 The Boolean representation of this PLC program is:

  • ABC + D
  • C + (A + B)D
  • C + D(A + B)
  • ABC + BD
  • C(AB + D)

Answer: C(AB + D)

Question 23 What is the color used for NO type switches?

  • Red
  • Green
  • non of the above

Answer: non of the above

Question 24 To reset the time for a PLC what condition must be true?

  • Reset rung of TON must be true.
  • Reset rung of TON must be false.
  • RST instruction with timer address must be true.
  • RST instruction with associated timer address must be false

Answer: RST instruction with timer address must be true.

Question 25 The below rung would represent what Boolean equation?

  • X • Y = Z
  • X + Y = Z
  • X • Y’ = Z
  • None of the above.

Answer: X • Y’ = Z

Question 26 To increase the number of inputs and outputs of the PLC, one can use expansion modules.

  • True.
  • False.
  • None of the above.

Answer: True.

Question 27 Solenoids, lamps, motors are connected to:

  • Analog output.
  • Digital output.
  • Analog input.
  • Digital input

Answer: Digital output.

Question 28 The _____ is moved toward the relay electromagnet when the relay is on.

  • Armature
  • Coil
  • NO contact
  • NC contact

Answer: Armature

Question 29 In a current sinking DC input module _____

  • The current flows out of the input field device
  • Requires that a AC sources be used with mechanical switches
  • The current flows out of the input module
  • Currents can flow in either direction at the input module

Answer: The current flows out of the input field device

Question 30 AC output field devices can interface to _____

  • AC output modules
  • Relay output modules
  • Both a and b
  • Neither a or b

Answer: Both a and b

Question 31 The difference between online and offline PLC programming is . . .

  • Whether the PLC is running or stopped
  • Whether the programming PC has internet connectivity
  • The type of programming cable used
  • Where the edited program resides
  • The type of programmer used

Answer: Where the edited program resides

Question 32 In PLC programming, a retentive function is one that:

  • Defaults to the “on” state
  • Comes last in the program
  • Defaults to the “off” state
  • Cannot be edited or deleted
  • Is not reset after a power cycle

Answer: Is not reset after a power cycle

Question 33 Normally open contacts are open when:

  • When Input is not energized
  • When the input is energized
  • When input is higher than 20 volts
  • None of these

Answer: When Input is not energized

Question 34 What is the largest integer number that a PLC counter function can reach if it uses a 16 bit register?

  • 32,768
  • 65,535
  • 65,536
  • 65,537
  • 32,767

Answer: 65,535

Question 35 An NOR function implemented in ladder logic uses:

  • Normally-closed contacts in series
  • Normally-open contacts in series
  • A single normally-closed contact
  • Normally-open contacts in parallel
  • Normally-closed contacts in parallel

Answer: Normally-closed contacts in series

Question 36 Which of the following instruction enables a jump to a subroutine?

  • JMP
  • SBR
  • RET
  • None of the above

Answer: JMP

Question 37 What are the features of SCADA?

  • Control feature using a graphical representation
  • Alarm Handling
  • Security Management
  • All of the above

Answer: All of the above

Question 38 Leading SCADA providers companies are.

  • Siemens WinCC
  • Microsoft
  • TCS
  • All of the above

Answer: Siemens WinCC

Question 39 What is Scripts in SCADA?

  • Scripts are basically a form
  • Scripts are basically a function
  • Scripts are basically a facility
  • Scripts are basically a favorite

Answer: Scripts are basically a function

Question 40 What is CIMPLICITY?

  • SCADA package
  • SCADA hardware
  • SCADA software
  • SCADA handler

Answer: SCADA package

Question 41 A good application for a timed interrupt in a PLC program would be:

  • A communications function block
  • A PID function block
  • A math function block
  • A motor start/stop rung
  • A “watchdog” timer

Answer: A PID function block

Question 42 What is the full form of RTU ?

  • Remote Terminate Unit
  • Remote Terminal Unit
  • Remote Translation Unit
  • Remote Transfer Unit

Answer: Remote Terminal Unit

Question 43 What is the full form DDE?

  • Dynamic Data Exchange
  • Data Dynamic Exchange
  • Domain Data Exchange
  • Different Data Exchange

Answer: Dynamic Data Exchange

Question 44 What is the difference between SCADA and HMI.

  • Both are same
  • HMI is not related with SCADA
  • HMI can be a part of SCADA but SCADA can’t be a part of HMI.
  • SCADA is a part of HMI

Answer: HMI can be a part of SCADA but SCADA can’t be a part of HMI.

Question 45 What are the differences between PLC and SCADA?

  • PLC is a hardware part while SCADA is a software part.
  • PLC is a  software  part while SCADA is a hardware part.
  • Both are hardware unit
  • Both are software

Answer: PLC is a hardware part while SCADA is a software part.

Question 46 A PLC consists of

  • Processor Unit
  • Program Memory
  • Input/output Section
  • Display Device
  • All of the above

Answer: All of the above

Question 47 An OR function implemented in ladder logic uses:

  • Normally-closed contacts in series
  • Normally-open contacts in series
  • A single normally-closed contact
  • Normally-open contacts in parallel
  • Normally-closed contacts in parallel

Answer: Normally-open contacts in parallel

Question 48 What is the full form of NEMA ?

National Electronics Manufacturing Association
National Electrical Manufacturing Association 
National Electrotechnical Manufacturing Association 
National Electromechanical Manufacturing Association 

Answer: National Electrical Manufacturing Association 

Question 49 Which of the following is not element of SCADA:

  • SCADA Communication
  • Mono Terminal Units
  • PLCs
  • RTUs

Answer: Mono Terminal Units

Question 50 Identify the problem in this motor control PLC program:

  • Coil
  • Start contact
  • Seal-in contact
  • Stop contact
  • Power source

Answer: Seal-in contact



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