Control Systems - Study Mode

[#186] The feedback control system in the figure is stable.
Correct Answer

(C) only if 0 ≤ K < 1

[#187] Consider the characteristic equation of a control system given by s 3 + (K + 0.5)s 2 + 4Ks + 50 = 0. Find the value of K for the system to have sustained oscillations.
Correct Answer

(C) 3.3

[#188] The open-loop transfer function of a system is given by $$Gleft( s
ight)Hleft( s
ight) = frac{{100left( {s + 100}
ight)}}{{sleft( {s + 10}
ight)}}.$$ xa0 xa0 xa0In the straight line approximation of the Bode plot, |G(jω) H(jω)| and ∠G(jω) H(jω) at ω = 100 rad/s are:
Correct Answer

(C) 20 dB and $$frac{{ - 3pi }}{4}$$xa0rad

[#189] For the flow diagram shown in figure, the transfer function $$frac{{Yleft( s
ight)}}{{Rleft( s
ight)}}$$xa0 is
Correct Answer

(A) $$frac{3}{{{s^2} + 6s + 11}}$$

[#190] The basic element for a pneumatic controller is
Correct Answer

(A) Op-Amp