134.  Closed loop poles are
A. zeros of G(s) H(s)
B. pole of G(s) H(s)
C. zeros of 1 + G(s) H(s)
D. pole of 1 + G(s) H(s)

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135.  Which of the following technique is not applicable to nonlinear system ?
A. functional analysis
B. Nyquist criterion
C. Quasi linearization
D. phase-plane representation

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136.  Backlash in a stable control system may cause:
A. underdamping
B. overdamping
C. low level oscillations
D. high level

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137.  Saturation in a stable control system may cause
A. overdamping
B. conditional stability
C. low level oscillations
D. high level oscillations

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138.  Noise in a control system can be kept low by
A. reducing the bandwidth
B. attenuating such frequencies at which external signals get coupled into the system
C. both A and B above
D. none of the above

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139.  Excessive noise in a control system may result in
A. reduction in gain
B. reduction in bandwidth
C. oscillations
D. saturation in amplifying stages

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140.  For a closed loop system to be stable, the Nyquist plot of G (s) H (s) must encircle the point (-1, j0) as many time as the number of
A. zeros of G(s) H(s) in the RHS of s-plane
B. zeros of G(s) H(s) in the LHS of s-plane
C. poles of G(s) H(s) in the RHS of s-plane
D. poles of G(s) H(s) in the LHS of s-plane

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