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Electrical Engineering Objective Questions { Control System }

29.  The break away points of root loci are
A. open loop poles
B. closed loop poles
C. open loop zeros
D. closed ioop zeros

30.  The number of root loci branches which do not terminate at zeros are equal to number of
A. poles
B. zeros
C. sum of A and B above
D. difference of A and B above

31.  The algebraic sum of the angles of the vectors from all poles and zeros to the point on any root locus segment is
A. always 180?
B. 180? or odd multiple thereof
C. always 90?
D. 90? or odd multiple thereof

32.  The transfer function of a system is 100(1 + 0.25s) (1 + 0.5s) The phase shift at co =0 and co =00 are
A. 0? and ?90?
B. 90? and ?90?
C. 90? and 180?
D. 0? and 180?

33.  The minimum phase transfer function is one having
A. poles and zeros in RHS
B. poles and zeros in LHS
C. poles in LHS and zeros in RHS
D. poles in MIS and zeros in RHS

34.  For type three system, the lowest frequency asymptote will have the slope of
A. ?20 dB/octave
B. ?6 dB/ocatave
C. ?12 dB/octave
D. ?18 dB/octave

35.  Which of the following gives information regarding difference in the number of poles and zeros of a closed loop transfer function?
A. Root locus method
B. Bode diagram
C. Nyquist diagram
D. Routh Hurwitz criterion

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