11 Multiple Chioce Questions In Applied Science

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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

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