CONTROL SYSTEM SET 23
1. The effect of adding feedback makes the system__________
a) Linear
b) Non-linear
c) Time variant
d) Time invariant
a) Linear
b) Non-linear
c) Time variant
d) Time invariant
Answer: a
2. The relation between output response and input signal in closed loop system is:
a) Exponential
b) Parabolic
c) Linear
d) Nonlinear
2. The relation between output response and input signal in closed loop system is:
a) Exponential
b) Parabolic
c) Linear
d) Nonlinear
Answer: c
3. Assertion (A): Practical systems must be closed loop system.
Reason (R): This is due to the fact that closed loop systems are least affected by parameter variations, stable, higher bandwidth, linear and more speed of response.
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
3. Assertion (A): Practical systems must be closed loop system.
Reason (R): This is due to the fact that closed loop systems are least affected by parameter variations, stable, higher bandwidth, linear and more speed of response.
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
Answer: a
4. Regenerative feedback is also called as_________________
a) Negative feedback
b) Positive feedback
c) No feedback
d) Negative and Positive Feedback
4. Regenerative feedback is also called as_________________
a) Negative feedback
b) Positive feedback
c) No feedback
d) Negative and Positive Feedback
Answer: b
5. Which of the following are the characteristics of regenerative feedback:
a) Zero damping
b) Stable
c) Least sensitive to parameter variations
d) None of the mentioned
5. Which of the following are the characteristics of regenerative feedback:
a) Zero damping
b) Stable
c) Least sensitive to parameter variations
d) None of the mentioned
Answer: a
6. Which of the following are true:
a) Sensitivity of regenerative feedback is more than negative feedback but less than non-feedback system
b) Sensitivity of regenerative feedback is more non-feedback system but less than negative feedback system
c) Sensitivity of regenerative feedback is less than both
d) Sensitivity of regenerative feedback is more than both
6. Which of the following are true:
a) Sensitivity of regenerative feedback is more than negative feedback but less than non-feedback system
b) Sensitivity of regenerative feedback is more non-feedback system but less than negative feedback system
c) Sensitivity of regenerative feedback is less than both
d) Sensitivity of regenerative feedback is more than both
Answer: c
7. Loop gain provided by the regenerative feedback makes the closed loop transfer function insensitive to G(s).
a) True
b) False
7. Loop gain provided by the regenerative feedback makes the closed loop transfer function insensitive to G(s).
a) True
b) False
Answer: a
8. Which of the following statements is correct for any closed loop system?
a) All the co-efficient can have zero value
b) All the co-efficient are always non-zero
c) Only one of the static error co-efficient has a finite non-zero value
d) None of the mentioned
8. Which of the following statements is correct for any closed loop system?
a) All the co-efficient can have zero value
b) All the co-efficient are always non-zero
c) Only one of the static error co-efficient has a finite non-zero value
d) None of the mentioned
Answer: c
9. Due to which of the following reasons excessive band width in control systems should be avoided?
a) It leads to slow speed of response
b) It leads to low relative stability
c) Noise is proportional to bandwidth
d) Presence of feedback
9. Due to which of the following reasons excessive band width in control systems should be avoided?
a) It leads to slow speed of response
b) It leads to low relative stability
c) Noise is proportional to bandwidth
d) Presence of feedback
Answer: c
10. In a stable control system backlash can cause which of the following?
a) Underdamping
b) Overdamping
c) Poor stability at reduced values of open loop gain
d) Low-level oscillations
10. In a stable control system backlash can cause which of the following?
a) Underdamping
b) Overdamping
c) Poor stability at reduced values of open loop gain
d) Low-level oscillations
Answer: d
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