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: Apr 21, 2026

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Question 1

What is the main advantage of using cascade control over a single-loop control system?

A : ascade control can handle multiple disturbances and setpoints simultaneously

B : Cascade control can improve the stability and performance of the primary process variable

C : Cascade control can reduce the complexity and cost of the control system

D : Cascade control can eliminate the need for sensors and actuators in the secondary loop

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

What sensor malfunction that causes values for a particular variable to be grossly out of range describes which process data?

A : Outliers

B : Noise

C : Drift

D : Bias

Answer: A

Question 4

Availability measures the percentage of time that a system is operational, while reliability measures the probability that a system performs its intended function without failure.

A : TRUE

B : False

C : It depends on the context

D : None of the above

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: Apr 21, 2026

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