Q. A system has its two poles on the negative real axis and one pair of poles lies on jω axis. The system is

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Q. In a minimum phase system

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Q. A stepper motor is

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Q. In a two phase ac servomotor rotor resistance is R and rotor reactance is X. The speed curve will be linear if

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Q. From the noise point of view, bandwidth should

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Q. The primary function of lag compensator is to provide sufficient

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Q. The polar plot of a transfer function passes through (-1, 0) point. The gain margin is

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Q. For a quadratic factor in transfer function the phase angle is not a function of damping factor.

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Q. The current rating of dc tachogenerator is usually

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Q. In a second order system, the time constant t of exponential envelopes depends

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Q. If feedback factor is β the overall gain of a closed loop system is approximately equal to

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Q. In control systems the magnitude of error voltage

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Q. The slope of log-magnitude asymptote changes by - 40 dB/ decade at a frequency ω₁. This means that

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Q. For a factor 1/(jω)² in the transfer function, the log magnitude plot

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Q. The frequency at which magnitude of closed loop frequency response is 3 dB below its zero frequency value is called critical frequency.

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Q. The transfer function 1/(1+jωT) has the characteristics of high pass filter.

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Q. Assertion (A): Positive feedback is not used in any circuit.

Reason (R): Positive feedback leads to instability.

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Q. If the Nyquist plot does not encircle the (-1 + j0) point the system is always stable.

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Q. Assertion (A): When the phase margin of a control system is improved using a lead network, noise transmission increases.

Reason (R): Phase lead compensation increases bandwidth.

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Q. The entries in the first column of Routh array of a fourth order are 5, 2, - 0.1, 2, 1. The number of poles in the right half plane are

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