Control Systems Objective Questions & Answers
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Time constant is defined as the time taken by the response of the system to reach  ?
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A first order system is initially at and subjected to a sudden input at t=0. Its output reaches 1.1 V in 4 sec and eventually reaches steady state of 2 V. Find the time constant?
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The open loop transfer function of a unity feedback control system is given by G(s) = k/s(s+1). If the gain k is increased to infinity, then damping ratio will tend to become
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A proportional plus derivative controller
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Find the stability for the following transfer function? G(s) = 50/s(s+5)
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For the polynomial P(s) = s^{4} + 8s^{3} + 18s² + 16s +5, find the number of roots which lie on the right half of splane?
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A second order control system has a transfer function 16/(s² + 4s + 16). What is the time for the first overshoot?
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The transfer function of a system is G(s) = 100/((s+1)(s+100)). For unit step input to the system the approximate settling time for 2% criterion is
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The Laplace transformation of f(t) is F(S) given F(s) = ω/S^{2} + ω^{2} the final value of f(t) is
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In which of the following controller band width is increased?
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The system is initially critical damped. If the gain of the system is doubled, then it will exhibit
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Which of the following controller has sluggish response?
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The system having characteristic equation s^{4} + 2s^{3} + 3s² + 2s + k = 0 is used to be an oscillator. What is the value of k?
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A proportional plus integral controller
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Which one of the following is the steady state error for a step input applied to a unity feedback system with the open loop transfer function G(s) = 10/(s²+14s+50)?
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The unit step response of the system is 1  e^{t}(1+t). Which is the system?
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Which one of the following is the response y(t) of a casual LTI system described by H(s) = (s+1)/(s²+2s+2) for a given input x(t) = e^{t} u(t)?
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The device necessarily used for automatic temperature control in a furnace is
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When the input to a system was with drawn at t=0, its output was found to decrease exponentially from 1000 units to 500 units in 1.386 sec. The time constant of the system is
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For the polynomial P(s) = 2s^{5} + s^{4} + 4s^{3} + 2s^{2} + 3s + 15, number of roots which lie in the right half of splane is
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Settling time for 5% tolerance band is 
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Transient response is improved in case of
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The transfer of a system is 10/(1 + S) when operated as a unity feedback system, the steady state error to a unit step input will be
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Two identical first order systems have been cascaded non interactively. The unit step response of the systems will be
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A ramp input applied to an unity feedback system results in 5% steady state error. The type number of the system is...........?
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The optimum values of damping ration is 
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The impulse response of an initially relaxed linear system is e^{2t}u(t). To produce a response of te^{2t}u(t), the input must be equal to
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Which of the following controller is also known as anticipatory controller?
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Transient state analysis depends on which of the following?
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A second order control system has a transfer function 16/(s² + 4s + 16). Find the settling time for 2% tolerance?
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