Automatic Control Systems
For 0 < M>
Answer: A
No answer description available for this question.
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Stepper motors find applications in
Answer: D
Stepper motors are used in all these applications.
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A thermometer requires 1 minute to indicate 98% of its final response to a step input. If it is a first order system the time constant is
Answer: C
0.98 = 1 - e-1/T or T = 0.25 minute.
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Assertion (A): If points at infinity are included, G(s) has same number of poles and zeros.
Reason (R): The function 
has a zero at s = - 2.
Answer: B
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Assertion (A): A slight change in pole-zero configuration can cause only minor changes in root locus configuration.
Reason (R): Asymptotes show the behaviour of root loci for |s| >> 1
Answer: D
Even a slight change in pole-zero position may affect root locus appreciably.
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The most commonly used devices for differencing and amplification, in control systems, are
Answer: C
Op-amps are commonly used due to their several advantages.
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The polar plot of a transfer function passes through (-1, 0) point. The gain margin is
Answer: A
When polar plot passes through (-1, 0) the system is on limit of stability and gain margin is zero
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Whether a linear system is stable or unstable that it
Answer: B
Stability is a property of the system only.
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Derivative control action is effective?
Answer: B
Derivative of constant is zero. Hence derivative control action is not effective is steady state.
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In position control system the device used for providing rate feedback voltage is
Answer: D
Tacho generator provides a voltage whose magnitude is proportional to speed.
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