Automatic Control Systems
The frequency at which magnitude of closed loop frequency response is 3 dB below its zero frequency value is called critical frequency.
Answer: B
It is not critical frequency.
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For the transport lag G(jω) = e-jωT, the magnitude is always equal to
Answer: B
Magnitude is 1.
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If the characteristic equation is (λ + 1) (λ + 2) (λ + 3) = 0, the eigen values are
Answer: A
No answer description available for this question.
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Lag compensation permits a high gain at low frequencies.
Answer: A
No answer description available for this question.
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In control systems the magnitude of error voltage
Answer: A
The error voltage is always very small. A high value of error voltage may cause instability.
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If the Nyquist plot does not encircle the (-1 + j0) point the system is always stable.
Answer: B
It is not necessary.
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A system has 12 poles and 2 zeros. Its high frequency asymptote in its magnitude plot has a slope of
Answer: A
-(12 - 2) 20 or - 200 dB/decade.
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For type 2 system, the magnitude and phase angle of the term (jω)2 in the denominator, at ω = 0, are respectively
Answer: C
If ω = 0, 
has a magnitude of infinity and phase angle -180°.
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The slope of log-magnitude asymptote changes by - 40 dB/ decade at a frequency ω1. This means that
Answer: C
A double pole or pair of complex poles result in - 40 dB/decade slope in log magnitude graph.
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Modelling error may occur due to
Answer: D
Any of these may cause modelling error.
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