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Automatic Control Systems - Engineering

Q1:

Assertion (A): An on off controller gives rise to oscillation of the output between two limits. Reason (R): Location of a pair of poles on jω axis gives rise to self sustained oscillations in the output.

A Both A and R are correct and R is correct explanation of A

B Both A and R are correct but R is not correct explanation of A

C A is correct but R is wrong

D R is correct but A is wrong

ANS:B - Both A and R are correct but R is not correct explanation of A

Sir but made easy gives the answer {A} in test series solution.

Please give me some explanation about it.