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Consider the following statements regarding control systems:

1. In open loop control system, the control action depends upon the desired output.

2. All control systems operated by present timing mechanism are open loop.

3. in a closed loop control system feedback signal is usually negative.

4. In open-loop control system stability cannot be ensured.


Q. Which of the above statements are correct?

  • a)
    1, 2, 3 and 4

  • b)
    1 and 4 only

  • c)
    1,2 and 3 only

  • d)
    2 and 3 only

Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Consider the following statements regarding control systems:1. In open...

  • There is no-control action in open loop systems. Hence, statement 1 is false.

  • Generally, all control systems operated by present timing mechanism are open loop because they are more stable than closed loop control system. Hence, statement-2 is true.

  • Due to various advantages of negative feedback systems (except reduction in gain), feedback signal is usually negative in a closed loop control system. Hence, statement-3 is true.

  • In open-loop control systems stability can be ensured because they are more stable than closed-loop control system.

  • Thus, only statements 2 and 3 are true.

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Most Upvoted Answer
Consider the following statements regarding control systems:1. In open...
Explanation:
Control systems are used to regulate or manipulate the behavior of a system. There are two types of control systems: open loop and closed loop.

1. In open loop control system, the control action depends upon the desired output.
- This statement is correct. In an open loop control system, the control action is not dependent on the output. Instead, it is based on a predetermined set of inputs, which are assumed to produce the desired output. There is no feedback mechanism to modify the output.

2. All control systems operated by present timing mechanism are open loop.
- This statement is incorrect. The timing mechanism can be used in both open loop and closed loop systems.

3. In a closed loop control system feedback signal is usually negative.
- This statement is correct. In a closed loop control system, the feedback signal is used to modify the output. The feedback signal is compared with the desired output, and the difference between the two is used to adjust the control action. The feedback signal is usually negative, which means that it is subtracted from the desired output.

4. In open-loop control system stability cannot be ensured.
- This statement is incorrect. Stability can be ensured in an open loop control system by designing the system properly. However, it is more difficult to ensure stability in an open loop system, as there is no feedback mechanism to correct errors.

Therefore, the correct answer is option D, which includes statements 2 and 3 only.
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Consider the following statements regarding control systems:1. In open loop control system, the control action depends upon the desired output.2. All control systems operated by present timing mechanism are open loop.3. in a closed loop control system feedback signal is usually negative.4. In open-loop control system stability cannot be ensured.Q. Which of the above statements are correct?a)1, 2, 3 and 4b)1 and 4 onlyc)1,2 and 3 onlyd)2 and 3 onlyCorrect answer is option 'D'. Can you explain this answer?
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