232. The transfer function of a system is 1 + s When operated as a unity feedback system, the steady state error to a unit step input will be transfer function Cc(s) ?(1 + 0.01s) The maximum phase angle lead provided by this compensator will occur at a frequency com is equal to

A. 50 rad/sec

B. 25 rad/sec

C. 10 rad/sec

D. 4 rad/sec

233. Signal flow graph is used to obtain the

A. stability of the system

B. transfer function of the system

C. controllability of the system

D. observability of the system

234. The effect of distance-velocity lag/ transportation lag is

A. to increase the phase margin

B. to reduce the phase margin

C. to alter the gain at a given to

D. to improve the transient response of the system

235. Sinusoidal oscillators are

A. stable

B. unstable

C. marginally stable

D. conditionally stable

236. If the gain of the open-loop system is doubled, the gain margin

A. is not affected

B. gets doubled K(s + 2)

C. marginally stable

D. conditionally stable

237. Given G(s) = s(s + 2) the transfer function is operated in a closed loop with unity feedback. The closed loop system is

A. stable

B. unstable

C. marginally stable

D. conditionally stable

238. The transfer function of transportation lag is Ca. If the lag is small as compared with the time constant of the system, it can be approximated by

A. sT

B. 1 + sT

C. 1 ? sT

D.1 + sT

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