The open loop control system is a type of control system in which the output is independent of the control input. This means that the output of the system is not affected by any feedback or correction mechanism. The control input is directly applied to the system, and the output is determined solely by the input and the system parameters.

In an open loop control system, there is no mechanism to measure or correct for any errors or disturbances in the system. The control input is predetermined and does not take into account any changes or variations in the system or its environment.

Explanation of the options:
a) The output is dependent on control input: This option is incorrect because in an open loop control system, the output is not dependent on the control input. The output is determined solely by the input and the system parameters.
b) The output is independent of control input: This is the correct option. In an open loop control system, the output is independent of the control input. The output is solely determined by the input and the system parameters.
c) Only system parameters have an effect on the control output: This option is incorrect because in an open loop control system, the output is not affected by any system parameters. The output is solely determined by the input and the system parameters.
d) None of these: This option is incorrect because option B is the correct answer.

Advantages and disadvantages of open loop control system:

Advantages:
1. Simple: Open loop control systems are generally simpler in design compared to closed loop control systems as they do not require feedback mechanisms or sensors.
2. Fast: Since there is no feedback loop, the response time of an open loop control system is usually faster.
3. Cost-effective: Open loop control systems are often less expensive to implement and maintain compared to closed loop control systems.

Disadvantages:
1. Lack of accuracy: Open loop control systems do not account for any disturbances or changes in the system, which can lead to inaccuracies in the output.
2. Sensitivity to variations: Open loop control systems can be highly sensitive to variations in the system or its environment, which can affect the output.
3. Limited adaptability: Open loop control systems are not able to adapt or correct for errors or disturbances in real-time, as they lack feedback mechanisms.

Overall, open loop control systems are suitable for situations where accuracy and adaptability are not critical, and simplicity and speed are prioritized.