Free ISA-IEC ISA-CAP Exam Questions

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

What is true of both single-phase and polyphase AC motors:

A : They both use a rotating magnetic field to induce torque in the rotor.

B : They both require a capacitor to create the necessary phase shift for starting.

C : They both have the same number of stator windings and rotor poles.

D : They both have the same efficiency and power factor

Answer: A

Question 3

What is the next best course of action after troubleshooting a system failure by replacing a suspected bad component with a known good component and finding that this does not correct the problem?

A : Replace another component that is related to the problem and test again

B : Consult a third person who has advanced knowledge about the system or the principles

C : Remove devices one at a time and test again

D : Insert faults into the system and observe the response

Answer: A

Question 4

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 5

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