The correct answer is D. Errors are caused by disturbances.
An open-loop control system is a control system that does not have any feedback from the output to the input. This means that the system cannot adjust its output based on how well it is performing. As a result, open-loop control systems are more likely to produce errors than closed-loop control systems.
Errors in open-loop control systems can be caused by a number of factors, including:
- Changes in the process being controlled
- Changes in the environment
- Improper calibration of the system
To minimize errors in open-loop control systems, it is important to carefully design the system and to monitor the process closely.
A. Less expensive: Open-loop control systems are typically less expensive to design and build than closed-loop control systems. This is because they do not require the same level of precision and accuracy.
B. Recalibration is not required for maintaining the required quality of the output: Open-loop control systems do not require recalibration for maintaining the required quality of the output. This is because the system does not adjust its output based on how well it is performing.
C. Construction is simple and maintenance easy: Open-loop control systems are typically simpler to construct and maintain than closed-loop control systems. This is because they do not require the same level of precision and accuracy.