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Control Systems

Control Systems
Slope of asymptote in Bode plot of 2nd order system is _____________________ per octave.

 18 dB
 12 dB
 3 dB
 6 dB

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Control Systems
Error at corner frequency ωcf of first order control system is -------

 ±4 db
 ±2 db
 ±3 db
 ±1 db

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Control Systems
What is the type of closed loop system for the plant transfer function G(s) = k/s²(1+Ts) and with unity feedback?

 2
 3
 0
 1

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Control Systems
Which one of the following is the response y(t) of a casual LTI system described by H(s) = (s+1)/(s²+2s+2) for a given input x(t) = e-t u(t)?

 e-t cott*u(t)
 e-t sint*u(t)
 e-t tant*u(t)
 e-t cost*u(t)

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Control Systems
A control system has open loop transfer function . Break away point is lies between

 any of the above.
 0 and -4.
 0 and 4.
 -4 and -6.

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Control Systems
The open loop transfer function of a unity feedback control system is given by G(s) = k/s(s+1). If the gain k is increased to infinity, then damping ratio will tend to become

 infinite
 unity
 zero
 0.707

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