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 above2. what is the input to a servo control loop?(1) Set Point(2) Error Voltage(3) Energy or load disturbance(4) none of the above3. What is the slope of a gain block?(1) 0dB/decade(2) +20 dB/decade(3) -20 dB/decade(4) none of the above4. 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 above5. . 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 above6. 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/sec7. 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) no9. 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) 10dB10. Is the system in Question 9 stable if the overall phase shift is +1300 when the overall gain is 0 dB?(1) yes(2) no11. 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