Unit Revision Quiz: Industrial Control Systems
Test your knowledge on SCADA, DCS, Programming, and Architecture.
1. What is the primary function of the Integral (I) term in a PID controller?
A. To provide an immediate response proportional to the error.
B. To eliminate steady-state offset (error) over time.
C. To predict future error based on the rate of change.
D. To provide protection against overshooting the setpoint.
The Integral term accumulates past errors to eliminate the small, persistent offset that the Proportional term cannot fix alone.
2. The IEC-61131-3 standard defines which five programming languages?
A. C++, Python, Ladder Diagram, Structured Text, Assembly.
B. Basic, Pascal, C, C#, Function Block Diagram.
C. Ladder Diagram, Function Block Diagram, Structured Text, Instruction List, Sequential Function Chart.
D. Sequential Function Chart, VHDL, C, C++, Structured Text.
IEC-61131-3 standardizes the five languages used in industrial control programming.
3. Which standard defines the integration levels between enterprise systems (ERP) and control systems (DCS/PLC)?
A. ISA-95
B. IEC-61499
C. OPC UA
D. NAMUR
ISA-95 defines the interface and data models between the Level 3 (MES) and Level 4 (ERP) systems in the automation pyramid.
4. A **Function Block (FB)**, as defined by IEC-61131-3, is distinct from a **Function** because it:
A. Only supports one type of input data.
B. Can only be programmed using Ladder Logic.
C. Must be compiled before execution.
D. Retains internal state (memory) between executions.
Functions have no memory (stateless), while Function Blocks (like timers or PID blocks) retain internal memory (stateful), which is essential for complex control logic.
5. Which component is generally used in SCADA systems for data acquisition and control in geographically dispersed, remote locations?
A. Human Machine Interface (HMI)
B. Remote Terminal Unit (RTU)
C. Enterprise Resource Planning (ERP)
D. Safety Instrumented System (SIS)
RTUs are specialized microprocessors used in SCADA applications for monitoring and control in remote areas, communicating back to the central master station.
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