Q. Assertion (A): If minimum phase system has a gain margin of 8 dB and phase margin of 21°, the system is stable.

Reason (R): For a minimum phase system both GM and PM must be positive for the system to be stable.

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Q. Which of the following can act as error detecting devices

1. a pair of potentiometers
2. a pair of synchros
3. a differential transformer
4. a metadyne
5. a control transformer

Select the answer using the following codes:

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Q. The M circle for M = 1 is the

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Q. In terms of ξ and ωn the settling time of a second order systems for 2% criterion and step input is equal to

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Q. Robotic manipulator arms mostly use

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Q. The sensor generally used in incremental optical encoder is

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Q. Integral control action

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Q. For any test point s on the real axis, the sum of angular contributions of the complex conjugate poles is

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Q. Nyquist stability criterion uses open loop frequency response characteristics.

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Q. For G(jω) = 1 / (1+jωT) as ω approaches infinity, the magnitude approaches zero and phase angle approaches - 90°.

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Q. For type 1 system the velocity lag error is

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Q. A lead compensator

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Q. Which of the following can be used as a rotating amplifier in a control system?

1. Amplidyne
2. Separately excited dc generator
3. Synchro
4. Self excited dc generator

Select the answer from the following codes:

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Q. Which of the following features is not associated with Nichols chart?

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Q. If any term in the first column of a Routh array becomes zero, then

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Q. In force current analogue, mechanical mobility is analogous to

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Q. The effect of adding poles and zeros can be determined quickly by

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Q. Assertion (A): When performance specifications are given in term of transient response characteristics, root locus method is a suitable method.

Reason (R): When performance specifications in terms of state variables are given, modern control methods can be used.

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Q. If the poles lie in second quadrant, damping ratio is

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Q. Lag compensation permits a high gain at low frequencies.

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