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Control Systems - Interview Questions and Answers

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61. If a step function is applied to the input of a system and the output remains below a certain level for all the time, the system is
A. not necessarily stable
B. stable
C. unstable
D. always unstable
Explanation:
62. Static error co-efficients are used as a measure of the effectiveness of closed loop systems for specified ________ input signal.
A. acceleration
B. velocity
C. position
D. all of the above
Explanation:
63. Which of the following is an electromechanical device ?
A. Induction relay
B. Thermocouple
C. LVDT
D. Any of the above
Explanation:
64. If the gain of the critical damped system is increased it will behave as
A. oscillatory
B. critically damped
C. overdamped
D. underdamped
Explanation:
65. A phase lag lead network introduces in the output
A. lag at all frequencies
B. lag at high frequencies and lead at low frequencies
C. lag at low frequencies and lead at high frequencies
D. none of the above
Explanation:
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