20.20、Our goal is to design a control system that can facilitate the iron melting process. Consider
the positions of the poles of the closed-loop system resulting from a particular design.
Which of the following should be generally avoided?
(A) Two negative equal real poles
(B) Two negative distinct real poles
(C) Two distinct real poles, one negative and one positive
(D) Complex-conjugate poles with negative real parts
22.22、You need to design a PID control system for the steel rolling process. In that design, there
are multiple objectives that must be achieved. Which of the following cannot be a possible
(A) To maximize the settling time (B) To minimize the steady-state error
(C) To maximize the phase margin (D) To minimize the maximum overshoot
28.28、Which of the following analysis is used to determine magnitudes and phase angle of
voltages at each bus and active and reactive power flow in each line?
(A) power flow analysis (B) short circuit analysis
(C) economic dispatch analysis (D) transient stability analysis
30.30. A three-phase 318.75kVA, 2300V alternator has an armature resistance of 0.35
and a synchronous reactance of 1.2
. Please determine the voltage regulation at
full-load kVA, 0.5 power factor leading, and rated voltage.
(A) 1.55% (B) 3.22% (C) 6.12% (D) -5.11%
39.重新載圖39、According to the circuit shown in the following Figure 11, calculate the frequency response
of iO/iS and find the poles and zeros. Please choose the correct descriptions. (A) 0.5 rad/s < pole < 1.5 rad/s (B) 1.5 rad/s < pole < 2.5 rad/s
(C) 0.5 rad/s < zero < 1.5 rad/s (D) 1.5 rad/s < zero < 2.5 rad/s