Unit 2

In an open loop control system

• Output is independent of control input

• Output is dependent on control input

• Only system parameters have effect on the control output

• None of the mentioned

For open control system which of the following statements is incorrect ?

• Less expensive

• Construction is simple and maintenance easy

• Errors are caused by disturbances

• Recalibration is not required for maintaining the required quality of the output

A control system in which the control action is somehow dependent on the output is known as

• Closed loop system

• Open system

In closed loop control system, with positive value of feedback gain the overall gain of the system will

• decrease

• increase

• be unaffected

The following has tendency to oscillate.

• Open loop system

• Closed loop system

In the feedback loop, the transfer function is given by

• C(s)/R(s)=G(s)/1+G(s)H(s)

• C(s)/R(s)=G(s)H(s)/1-G(s)H(s)

• C(s)/R(s)=G(s)/1+G(s)H(s)

• C(s)/R(s)=G(s)/1-G(s)H(s)

Traffic light system is the example of:

• 1. Open-loop system

• 1. Closed-loop system

• 1. Both (a) and (b)

The negative feedback closed-loop system was subjected to 15V. The system has a forward gain of 2 and a feedback gain of 0.5. Determine the output voltage.

• 15V

• 10V

• 20V

• 5V

The transfer function of the given system is:

• 
• 
• 

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