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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Q. In Bode diagram (log magnitude plot) the factor (jω)^n in the transfer function gives a line having slope

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Q. The magnitude of transport lag factor is always zero.

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Q. If G(s) H(s) = 1/(s²+100), the closed loop poles are on

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Q. A system has 12 poles and 2 zeros. Its high frequency asymptote in its magnitude plot has a slope of

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Q. The open loop transfer function of a unity feedback system is G(s) = 1/(s+2)². The poles of closed loop system are at

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Q. If G(jω) = 1/(1+(jωT) the polar plot, as the frequency is varied from 0 to infinity is

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Q. Lag compensation increases bandwidth of the system.

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Q. The effect of negative feedback on distortion and bandwidth because

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Q. Which of the following rotors are used in two phase ac servomotor?

1. Solid iron rotor
2. Squirrel cage rotor
3. Drag cup rotor

Of the above the correct ones are

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