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Control Systems - Interview Questions and Answers

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56. Which of the following is an open loop control system ?
A. Field controlled D.C. motor
B. Ward leonard control
C. Metadyne
D. Stroboscope
Explanation:
57. The frequency and time domain are related through which of the following?
A. Laplace Transform and Fourier Integral
B. Laplace Transform
C. Fourier Integral
D. Either (b) or (c)
Explanation:
58. Velocity error constant of a system is measured when the input to the system is unit _______ function.
A. parabolic
B. ramp
C. impulse
D. step
Explanation:
59. Addition of zeros in transfer function causes which of the following ?
A. Lead-compensation
B. Lag-compensation
C. Lead-lag compensation
D. None of the above
Explanation:
60. In order to increase the damping of a badly underdamped system which of following compensators may be used ?
A. Phase-lead
B. Phase-lag
C. Both (a) and (b)
D. Either (a) and (b)
Explanation:
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