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: Dec 06, 2025

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Question 1

Integral action is a controller action that adjusts the output of a controller based on the accumulated error over time. Integral action eliminates offset by continuously shifting the proportional band until the error is zero. Integral action operates on the:

A : urrent error

B : Rate of change of error

C : Sum of past errors

D : Difference between setpoint and process variable

Answer: A

Question 2

Which of the following is the most critical step in writing a custom software program for an automation system?

A : Testing and debugging the program

B : Documenting and commenting the program

C : Analyzing and designing the program

D : Compiling and deploying the program

Answer: A

Question 3

Which of the following can be considered a fixed speed motor?

A : three-phase AC induction motor powered directly from the AC line

B : A single-phase AC induction motor with a capacitor start

C : A DC motor with a variable voltage supply

D : A synchronous motor with a variable frequency drive

Answer: A

Question 4

Which of the following is not a valid form of PID algorithm implemented in modern PID controllers?

A : Parallel form

B : Ideal form

C : Series form

D : Hybrid form

Answer: A

Question 5

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

Page: 1 / 112

Total 557 Questions | Updated On: Dec 06, 2025

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