SCADA (Supervisory Control and Data Acquisition) is an important topic for competitive exams like UPPCL JE, UPRVUNL JE, and PGCIL DT. Below are well-structured SCADA MCQs with correct answers and brief explanations to help you prepare.
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The SCADA systems are used to:
A) Monitor
B) Control
C) Both A and B ✅
D) None of the above
Explanation: SCADA is used to monitor and control processes remotely, making both options valid.
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The standard form of RTU is:
A) Reverse Terminal Unit
B) Remote Terminal Unit ✅
C) Reverse Unit
D) None of the above
Explanation: RTU is a field device used to collect data and send it to the central SCADA system.
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The standard form of MTU is:
A) Master Terminal Unit ✅
B) Main Terminal Unit
C) Main Unit
D) None of the above
Explanation: MTU is the main controller in a SCADA system.
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The standard form of HMI is:
A) Human Master Interface
B) Human Machine Interface ✅
C) Human Main Interface
D) None of the above
Explanation: HMI allows operators to interact with SCADA systems through visual screens.
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Types of SCADA systems include:
A) Monolithic, Distributed
B) Monolithic, Networked
C) Monolithic, Distributed, Networked ✅
D) None of the above
Explanation: SCADA systems evolved through these three main types over time.
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The standard form of MMI is:
A) Main Machine Interface
B) Master Machine Interface
C) Man Machine Interface ✅
D) None of the above
Explanation: MMI is another term for HMI used in industrial automation.
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SCADA can be used in:
A) Manufacturing
B) Mass transit
C) Traffic signals
D) All of the above ✅
Explanation: SCADA is used across various sectors for real-time monitoring and control.
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A complex SCADA system has:
A) One
B) Two
C) Three
D) Four ✅
Explanation: Complex SCADA systems have four levels: field devices, communication, control, and operator level.
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SCADA system performs:
A) Data presentation
B) Data acquisition
C) Networked data communication
D) All of the above ✅
Explanation: SCADA systems are comprehensive solutions performing all these functions.
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Functions of SCADA are performed by:
A) Sensors, communication network
B) SCADA master units
C) Remote telemetry units
D) All of the above ✅
Explanation: All listed components work together in a SCADA system.
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Not a component of SCADA:
A) Sparger controller ✅
B) Output system
C) Database server
D) None of the above
Explanation: It's unrelated to SCADA; more common in chemical systems.
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RAID 50 is a combination of:
A) RAID 1 and RAID 0
B) RAID 5 and RAID 0 ✅
C) RAID 3 and RAID 0
D) None of the above
Explanation: RAID 50 offers better fault tolerance and performance by combining striping and parity.
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Standard form of RAID:
A) Reduced Array of Independent Disks
B) Reverse Array of Independent Disks
C) Redundant Array of Independent Disks ✅
D) Random Array of Independent Disks
Explanation: RAID improves performance and redundancy using multiple drives.
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RAID is used for:
A) Improvement of performance
B) Improvement of reliability
C) Both A and B ✅
D) None of the above
Explanation: RAID uses redundancy and data distribution to boost both reliability and performance.
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Redundancy in RAID is achieved by:
A) Mirroring or shadowing
B) Parity scheme
C) Both A and B ✅
D) None of the above
Explanation: RAID ensures redundancy through both methods.
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RAID performance improvement is achieved by:
A) Mirroring or shadowing
B) Parity scheme
C) Parallelism
D) Both B and C ✅
Explanation: Data is read/written in parallel to improve speed.
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Standard form of CRC:
A) Cyclic Redundancy Check ✅
B) Code Redundancy Check
C) Cyclic Redundancy Code
D) None of the above
Explanation: CRC is a technique used for error-checking in digital networks.
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Developer of DNP3 protocol:
A) Jonas Wenstrom
B) William Ritchie
C) Michael Faraday
D) Harris ✅
Explanation: Harris developed DNP3 to facilitate interoperability in SCADA systems.
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Suitable multiple access for analog radios:
A) Code Division Multiple Access
B) Time Division Multiple Access
C) Frequency Division Multiple Access ✅
D) None of the above
Explanation: Analog systems commonly use frequency division for multiple users.
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Suitable multiple access for digital radios:
A) Code Division Multiple Access
B) Time Division Multiple Access
C) Frequency Division Multiple Access
D) Both A and B ✅
Explanation: Digital radios often use TDMA or CDMA for efficient bandwidth usage.
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SCADA communication protocols include:
A) Modbus
B) Profibus
C) DNP3
D) All of the above ✅
Explanation: SCADA systems use standard protocols like Modbus, Profibus, and DNP3 for device communication.
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DNP3 stands for:
A) Digital Network Protocol version 3
B) Distributed Network Protocol version 3 ✅
C) Dynamic Network Protocol version 3
D) None of the above
Explanation: DNP3 is a reliable SCADA communication protocol used in utility automation.
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SCADA is essential in power systems for:
A) Real-time fault monitoring
B) Load management
C) Outage detection
D) All of the above ✅
Explanation: SCADA helps ensure reliability and continuity in power system operation.
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Which of the following is a non-SCADA function?
A) Voltage monitoring
B) Speed control of motors
C) Current measurement
D) Emailing reports ✅
Explanation: While reports may be generated, SCADA doesn't handle communication tasks like emailing.
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A key feature of SCADA systems is:
A) Manual operation only
B) Real-time control ✅
C) Delayed monitoring
D) File-based storage
Explanation: SCADA systems offer real-time data acquisition and control functionalities.
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The communication backbone in a modern SCADA system is typically:
A) Analog network
B) Coaxial cable only
C) Digital network (fiber optics, Ethernet, etc.) ✅
D) Satellite link only
Explanation: Modern SCADA systems rely on high-speed digital networks for real-time data exchange.
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In SCADA architecture, which device collects data from the field and sends it to MTU?
A) PLC
B) HMI
C) RTU ✅
D) SCADA software
Explanation: RTUs gather data from sensors and transmit it to the MTU for control decisions.
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SCADA systems help in improving:
A) Data redundancy
B) Manual reporting
C) Operational efficiency and reliability ✅
D) Internet connectivity
Explanation: By automating data collection and control, SCADA enhances efficiency and reduces human error.
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A key cyber security threat to SCADA is:
A) Physical theft
B) Password reset
C) Unauthorized remote access ✅
D) Cable wear and tear
Explanation: SCADA systems are vulnerable to hacking and require strong cybersecurity measures.
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SCADA system can be connected to which of the following for remote access?
A) PLC only
B) Local USB port
C) Cloud or internet network ✅
D) Battery backup
Explanation: Cloud integration allows SCADA systems to be accessed and controlled remotely.
