Free ISA-IEC ISA-CAP Exam Questions

Become ISA-IEC Certified with updated ISA-CAP exam questions and correct answers

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Total 557 Questions | Updated On: Jan 28, 2026

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Question 1

Which of the following PLC programming languages is based on a graphical representation of relay logic circuits?

A : Ladder Diagram (LD)

B : Function Block Diagram (FBD)

C : Structured Text (ST)

D : Instruction List (IL)

Answer: A

Question 2

Why is it important for field maintenance technicians to enter and validate data in real time?

A : It can improve the accuracy and completeness of data and reduce errors and rework

B : It can increase the efficiency and productivity of data collection and analysis

C : It can enhance the communication and collaboration among field technicians and other stakeholders

D : All of the above

Answer: A

Question 3

What is the effect of increasing the derivative gain (KD) of a PID controller?

A : It reduces the rise time and the overshoot, but increases the steady-state error and the settling time

B : It reduces the overshoot and the settling time, but increases the rise time and the steady-state error

C : It reduces the rise time and the steady-state error, but increases the overshoot and the settling time

D : It reduces the settling time and the overshoot, but increases the rise time and the steady-state error

Answer: A

Question 4

Which of the following BEST describes the different technology logic systems used in safety systems?

A : They are systems that use sensors, logic solvers, and final control elements to take the process to a safe state in case of an emergency.

B : They are systems that use switches, relays, and valves to control the process variables and prevent any safety hazards.

C : They are systems that use transmitters, controllers, and actuators to monitor the process conditions and optimize the performance.

D : They are systems that use scanners, computers, and displays to collect and analyze the process data and provide feedback.

Answer: A

Question 5

Some newer microprocessor-based single loop controls can do the following things that lead to the controllers sometimes being called hybrid control systems:

A : They can execute more than one PID control algorithm for a process loop, by time-sharing their calculating power.

B : They can communicate with other controllers and SCADA systems via network protocols.

C : They can store programs and data in non-volatile memory for high reliability and easy maintenance.

D : All of the above.

Answer: A

Page: 1 / 112

Total 557 Questions | Updated On: Jan 28, 2026

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