CONTROL SYSTEM questions asked in TRB EEE POLYTECHNIC LECTURER EXAM 2017 with detailed answers.

 

           Answer:

                       It is mentioned roots are moving away from imaginary axis but they didnt           mentioned moving direction (Right side or left side of imaginary axis) . If it is moved right side of imaginary axis system stability will be decreased. If it is moved left side of imaginary axis system stability will be increased. Here we can choose undefined.

Answer:

                

                                         So answer is B.

                 Answer is B. Negative feedback reduce error signal.

                Answer is A.

      Answer : B

As Corner frequency is not given, We cannot find exact function.