A negative feedback system has . The closed loop system is stable for K > 20 15

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Question
A negative feedback system has . The closed loop system is stable for
Options
A. K > 20
B. 15 < K < 19
C. 8 ? K ? 14
D. K < 6

Correct Answer

K < 6

Explanation

Find characteristic equation.

Automatic Control Systems problems

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2. Assertion (A): Potentiometers can not be used as error detectors in position control systems.
Reason (R): The resolution of a potentiometer places an upper limit on its accuracy
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is correct but R is wrong
D. R is correct but A is wrong

3. From the noise point of view, bandwidth should
Options
A. be large
B. not be too large
C. should be as large as possible
D. should be infinite

4. The compensator of the given figure is a
Options
A. lag compensator
B. lead compensator
C. lag-lead compensator
D. none of the above

7. Stepper motors find applications in
Options
A. X-Y plotters
B. numerically controlled machining equipment
C. printers
D. all of the above

8. The log magnitude curve for a constant gain K is a
Options
A. horizontal straight line
B. horizontal straight line of magnitude 20 log K decibels
C. an inclined line having slope K
D. an inclined line having slope -K

10. In an integral controller
Options
A. the output is proportional to input
B. the rate of change of output is proportional to input
C. the output is proportional to rate of change of input
D. none of the above

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