68702. If phase angle of open loop transfer function becomes - 180° at frequency ω1, then gain margin is equal to
68703. For the second order system having following differential equation(When θ0 and θi are output and input) the natural frequency is
68704. For a second order system, the position of poles is in the shaded region shown in the given figure. The variation in damping factor is
68705. For a factor in the transfer function, the log magnitude plot
68706. The frequency at which magnitude of closed loop frequency response is 3 dB below its zero frequency value is called critical frequency.
68707. The transfer function has the characteristics of high pass filter.
68708. In a second order system, the time constant t of exponential envelopes depends
68709. The maximum shift which can be provided by a lead compensator with transfer function is
68710. The network of the given figure is a
68711. The resistance R of a liquid flow system is defined as
68712. For quadratic factor. In Bode log magnitude plot the high frequency asymptote is a straight line having the slope
68713. 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.
68714. In liquid flow system the capacitance of a water tank is defined as
68715. For a first order system having transfer function , the unit ramp response is
68716. If feedback factor is β the overall gain of a closed loop system is approximately equal to
68717. The functions and have
68718. Assertion (A): Positive feedback is not used in any circuit.Reason (R): Positive feedback leads to instability.
68719. For the equation where Q is heat energy Gt is thermal conductance and θ is temperature, analogous electrical equation is
68720. If the Nyquist plot does not encircle the (-1 + j0) point the system is always stable.
68721. A system hasFor unit step input the settling time for 2% tolerance band is
68722. A system has transfer function. If a sinusoidal input of frequency ω is applied the steady state output is of the form
68723. For a quadratic factor in transfer function the phase angle is not a function of damping factor.
68724. The current rating of dc tachogenerator is usually
68725. For the compensator in the given figure the maximum phase lead is
68726. Lag compensation increases bandwidth of the system.
68727. Assertion (A): The time response of the system with will not have any overshoot for unit step input.Reason (R): A critically damped system does not have any overshoot to a unit step input.
68728. The polar plot of the given figure is for the term
68729. The effect of negative feedback on distortion and bandwidth because
68730. Which of the following rotors are used in two phase ac servomotor? Solid iron rotorSquirrel cage rotorDrag cup rotor Of the above the correct ones are
68731. Given figure shows a unity feedback system. The ratio of time constants for open loop and closed loop response are
68732. For a second order system damping factor is 0.1. If ωd is frequency of damped oscillations and ωn is natural frequency, then
68733. The phase angle curve of G(jω) H(jω) can be drawn
68734. The most commonly used devices for differencing and amplification, in control systems, are
68735. In Bode method of stability analysis, the error curve is not symmetric about corner frequency.
68736. Phrasal Verb:To shrug one’s shoulders
68737. For the feedback system with closed loop transfer function the settling time for 2% tolerance
68738. In a second order system with a unit step input, the speed of response is high if system is
68739. 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
68740. 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
68741. In a second order system ωn = 10 rad/sec and ζ = 0.1, then ωd =
68742. A system has 12 poles and 2 zeros. Its high frequency asymptote in its magnitude plot has a slope of
68743. The open loop transfer function of a unity feedback system is The poles of closed loop system are at
68744. For the system of the given figure the closed loop poles are located at
68745. If the polar plot, as the frequency is varied from 0 to infinity is
68746. The response is
68747. For a first order system having transfer function, the unit step response is
68748. Which of the following is not a necessary advantage of negative feedback system?
68749. In position control system the device used for providing rate feedback voltage is
68750. For the system of the given figure, the closed loop poles are at
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