# By increasing the gain ‘k’ of a system, steady state error of the system

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By increasing the gain ‘k’ of a system, steady state error of the system (a) increases (b) decreases (c) remains unaffected (d) nothing can be said

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In lag compensator the damping ratio, gain and steady state error (ess) are   (a) Decreases, Decreases and Increases (b) Decreases, Increases and Increases (c) Increases, Increases and Decreases (d) Increases, Decreases and Decreases

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For a feedback control system of type 2, the steady error for a rap input is  A) Infinite B) Constant C) Zero D) Indeterminate

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The characteristic equation for a closed loop system with forward gain K is s4 + 4s3 + 8s2 + 6s + K = 0. The critical gain value Kc for stability should not exceed  (a) 3.25 (b) 9.75 (c) 13.0 (d) 23.3

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A linear time -invariant control system with unsatisfactory steady state error is to be compensated. Which is/are the correct type of cascade compensation to be provided ? 1. Lead 2. Lag 3. Lag -lead Select the correct answer using the codes given below : (a) 1 only (b) 2 only (c) 3 only (d) 1, 2 and 3

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After drawing the Root-Locus, the closed-loop poles corresponding to a specified value of gain K can be determined from which of the following criterion ? (A) Magnitude criterion alone (B) Angle criterion alone (C) Both Magnitude and Angle criteria (D) Angle of departure and angle of arrival.

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Given a unity feedback system with G(s)=k/s (s+4), the value of k for damping ratio of 0.5 is

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Velocity error constant of a system is measured when the input to the system is unit _______ function.

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A system is critically damped. If the gain of the system is increased, the system will behave as: A) overdamped B) underdamped C) oscillatory D) critically damped

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The sensitivity of a closed loop system to gain changes and load disturbances depends upon (a) forward gain (b) loop gain (c) frequency (d) all the above

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The gain margin of a system is 0 dB. It represents a   (a) Stable system (b) Unstable system (c) Marginally stable system (d) Conditionally stable system

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A unity negative feedback control system is found to have a gain margin of 20 dB. The Nyquist plot of the system (A) crosses the real axis at +0.1 (B) crosses the real axis at -0.1. (C) crosses the imaginary axis at -0.1 (D) crosses the imaginary axis at +0.1

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In the Bode plot of a unity feedback control system, the value of phase of G(jw) at the gain cross -over frequency is - 125°.. The phase margin of the system is (a) - 125° (b) - 55° (c) 55° (d) 125°

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______increases the steady state accuracy.

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If the gain of the open loop system is doubled, the gain margin  (1) Is not affected (2) Gets doubled (3) Becomes half (4) Becomes one -forth

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If the gain of the critical damped system is increased it will behave as?

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Consider the following properties attributed to state model of a system : 1. State model is unique. 2. Transfer function for the system is unique. 3. State model can be derived from transfer function of the system.  Which of the above statements are correct ?  (a) 1, 2 and 3 (b) 1 and 2 only (c) 2 and 3 only (d) 1 and 3 only

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A system with gain margin close to unity or a phase margin close to zero is (a) conditionally stable (b) relatively stable (c) highly stable (d) highly oscillatory

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By adding a pole at the origin of s -plane, the Nyquist plot of a system will rotate by (a) 90° in anti -clockwise direction (b) 90° in clockwise direction (c) 180° in anti -clockwise direction (d) 180° in clockwise direction

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With negative feedback, the system stability and system gain respectively (a) Increases and increases (b) Increases and decreases (c) Decreases and increases (d) Decreases and decreases

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A cylinder rotor generator delivers 0.5 pu power in the steady-state to an infinite bus through a transmission line of reactance 0.5 pu. The generator no-load voltage is 1.5 pu and the infinite bus voltage is 1 pu. The inertia constant of the generator is 5 MW -s MVA / and the generator reactance is 1 pu. The critical clearing angle, in degrees, for a three-phase dead short circuit fault at the generator terminal is  (A) 53.5 (B) 60.2 (C) 70.8 (D) 79.6

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A passive two port network is in a steady state. Compared to its input, the steady state output can never offer  A) Higher voltage B) Lower impedance C) Greater power D) Better regulation

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A passive 2-port network is in a steady state, compared to its input, the steady state output can never offer   (a) Higher voltage (b) Lower impedance (c) Greater power (d) Better regulation

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If stability error for step input and speed of response be the criteria for design, what controller would you recommend (1) P controller (2) PD controller (3) PI controller (4) PID controller

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The effect of error damping is to?

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State the number of sub-shells in K,L,M,N shells.

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The state equations in the phase variable canonical form can be obtained from the transfer function by (a) Cascade decomposition (b) Direct decomposition (c) Inverse decomposition (d) Parallel decomposition

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Which of the following statements is true?  (1) steady-state stability limit is greater than transient stability limit  (2) steady-state stability limit is equal to transient stability limit  (3) steady-state stability limit is less than the transient stability limit  (4) no generalization can be made regarding the equality or otherwise of the steady-state stability limit and transient stability limit

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A transfer function has a second order denominator and constant gain in the numerator

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The error detecting element in a control system gives: - a) the sum of the reference signal and feedback signal b) the sum of the reference signal and error signal c) the difference of the reference signal and feedback signal d) the difference of the reference signal and output signal

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A differential amplifier has a differential gain of 20,000, CMRR : 80 dB. The common mode gain is given by