11 multiple chioce questions in applied science

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