1. what is the input to a process control system?
(1) Set Point
(2) Error voltage
(3) Energy or load disturbance
(4) none of the above
2. what is the input to a servo control loop?
(1) Set Point
(2) Error Voltage
(3) Energy or load disturbance
(4) none of the above
3. What is the slope of a gain block?
(1) 0dB/decade
(2) +20 dB/decade
(3) -20 dB/decade
(4) none of the above
4. What is the slope of a first-order derivative block?
(1) 0dB/decade
(2) +20 dB/decade
(3) -20 dB/decade
(4) none of the above
5. . What is the slope of a first-order integral block?
(1) 0dB/decade
(2) +20 dB/decade
(3) -20 dB/decade
(4) none of the above
6. An element has a transfer function of (1 + 5x)2. What is the critical frequency?
(1) 5 rad/sec
(2) 0.5 rad/sec
(3) 0.2 rad/sec
(4)2 rad/sec
7. A Bode gain plot for an element follows a horizontal 40dB until w = 3 rad/sec where it decreased by -40dB/decade. What is the transfer function for this element?
(1) 40/(1+3s)2
(2) 100/(1+0.33s)2
(3) 40/(1+0.338)2
(4) 100/(1+0.33s)
8. A negative-feedback system has a phase shift of +1800 and a gain of +10dB at 1 rad/sec, and a phase shift of +1600 and a gain of 0dB at 0.2 rad/sec. Is the system stable?
(1) yes
(2) no
9. A negative-feedback system has a phase shift of -1800 and a gain of -10 dB at 1 rad/sec. What is the gain margin?
(1) 0dB
(2)-10 dB
(3) 20 dB
(4) 10dB
10. Is the system in Question 9 stable if the overall phase shift is +1300 when the overall gain is 0 dB?
(1) yes
(2) no
11. A negative-feedback system has a gain of 0 dB and a phase shift of -1500 at 1 rad/sec. What is the phase margin?
(1) 1800
(2) 300
(3) 1500
(4) none of the above