# 11 multiple chioce questions in applied science

1. what is the input to a process control system?

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(1) Set Point

(2) Error voltage

(4) none of the above

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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

(4) none of the above

4. What is the slope of a first-order derivative block?

5. . What is the slope of a first-order integral block?

6. An element has a transfer function of (1 + 5x)2. What is the critical frequency?

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

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