Transfer function of a system is used to calculate ...

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Transfer function of a system is used to calculate

(a) the steady state gain (b) the time constant (c) the order of the system (d) the output for a given input

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A system has transfer function (1–s) ÷ (1+s). It is  A) Non minimum phase transfer function B) Minimum phase transfer function C) Low pass system D) Second order system

The dc gain of the system represented by the transfer function G(s)=(s+6)/((s+2)(s+3)) is  A) 1 B) 2 C) 5 D) 6

Order of the open loop transfer function is _____ to order of closed loop transfer function   (a) not equal (b) equal (c) less than (d) greater than

If a step function is applied to the input of a system and the output remains below a certain level for all the time, the system is?

With the knowledge of the state variable representation of a plant the transfer function of the plant

The loop transfer of a system is G(s) H(s) = 5/(s+1) (2s+1)(3s+1) which has the phase crossover frequency fc = 0.16 Hz. The gain margin (dB) of the system is  (a) 6 (b) 4 (c) 2 (d) 0

A system has 14 poles and 2 zeros in its open -loop transfer function. The slope of its highest frequency asymptote in its magnitude plot is (a) - 40 dB/dec (b) - 240 dB/dec (c) + 40 dB/dec (d) + 240 dB/dec

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

For a system with derivative feedback, forward path transfer is G(s) = I / (s2 + s + 1) and feedback path transfer is H(s) = Ks. What is the value of K to obtain a critically-damped closed loop transient response.  (a) 0.5 (b) 0.707 (c) 1 (d) 1.414

One of the necessary and sufficient condition for a network function N(s)=p(s)/q(s) to be a transfer function is that  A) The coefficients of the polynomial p(s) and q(s) must be real and those for q(s) must be positive B) Coefficients of p(s) and q(s) must be real and positive C) Coefficients of p(s) must be positive and real but coefficients of q(s) can be negative also D) Degree of p(s) and q(s) may differ by either zero or one only

The transfer function of a phase lead compensator is found to be the form (s+z1 ) / (s + p1 ) and that of a lag compensator to be of the form (s+z2 ) / (s + p2 ). Then which of the following conditions must be satisfied?  (A) z1 > p1 and z2 > p2 (B) z1 > p1 and z2 < p2 (C) z1 < p1 and z2 < p2 (D) z1 < p1 and z2 > p2

Draw a neat labeled diagram to show protective system for AC traction and give the function of each relay used in it.

A PD controller is used to compensate a system. Compared to the uncompensated system, the compensated system has: (1) A higher type number. (2) Reduced damping. (3) Higher noise amplification. (4) Larger transient overshoot.

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

Addition of a pole to the open loop transfer function has the effect of (A) Pulling the root locus to the left (B) Pulling the root locus to the right (C) Either (A) or (B) (D) Does not have any effect on the root locus

The output of a feedback control system must be a function of?

An electromechanical closed –loop control system has the transfer function C(s)/R(s) = k/s (s2 + s +1) (s+ 4) +k. Which one of the following is correct?  (A) The system is stable for all positive values of k (B) The system is unstable for all values of k (C) The system is stable for values of k between zero and 3.36 (D) The system is stable for values of k between 1.6 and 2.45

An _____________is a network of electrical components used to supply, transfer and use electric power:  (A) Electric power system (B) Electric power (C) All of the above (D) None of the above

In Torque-Voltage analogy, the Moment of Inertia of a mechanical rotational system is analogous to (A) Capacitance C. (B) Inductance L. (C) Resistance R. (D) Inductive reactance XL

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

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

When the initial conditions of a system are specified to be zero it implies that the system is?

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

The transient response of a system is mainly due to?

In a control system the output of the controller is given to?

A differentiator is not usually used in control system, because it : - (A) reduces damping  (B) increases error  (C) reduces gain margin  (D) increases input noise

Knowledge of Transfer Function is necessary for the calculation of: - a) The Time Constant b) The output for a given input c) The steady state gain d) The order of the system

The stator of a 3 phase, 10 pole induction motor possesses 120 slots. If a lap winding is used, calculate the coil pitch, if the coil width extends from slot 1 to slot 11.  (A) 72.12% (B) 83.30% (C) 12% (D) 42%

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

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

A control system with excessive noise, is likely to suffer from?

_______ electric power is the most common method used by electrical grids to transfer power.  (A) One-phase (B) Two-phase (C) Three-phase (D) None of the above

A minimum phase transfer function has: a) poles in the left half of the s -plane  b) zeros in the left half of the s -plane  c) poles in the left half of the s -plane and zeros in the right half of the s - plane  d) no poles and zeros in the right half of the s -plane or on the jw - axis excluding origin

What will happen to the gain margin if the gain of the open loop system is doubled? A) Doubled B) Becomes half C) Is not affected D) Becomes one-fourth

The correct sequence of steps required to improve system stability is  (A) Insert derivative action, use negative feedback, reduce gain (B) Reduce gain, use negative feedback, insert derivative action (C) Reduce gain, insert derivative action, use negative feedback (D) Use negative feedback, reduce gain, insert derivative action

Phase margin is the amount of angle to make the system  (1) Oscillatory (2) Stable (3) Unstable (4) Exponential

The correct sequence of steps needed to improve system stability is (a) Insert derivation action, Use negative feedback and Reduce gain (b) Reduce gain, Use negative feedback and Insert derivation action (c) Reduce gain, Insert derivation action and Use negative feedback (d) Use negative feedback, Reduce gain and Insert derivation action

Two wattmeters are used to measure the power in a 3 -phase balanced system. What is the power factor of the load when one wattmeter reads twice the other ?  (a) 0 (b) 0.5 (c) 0.866 (d) 1

Transfer function is defined for: - a) Linear and time invariant System b) Linear and time variant system c) Non -Linear time invariant system d) Non -Linear and time variant system

Companding is a technique used to achieve: -  a) uniform quantization b) delta modulation c) non uniform quantization d) differential quantization

In order to regulate steady state error to zero, in a negative feedback control system, one employs

What is the time response of a system whose poles lie on the right hand side of s-plane? A) Exponentially increasing B) Exponentially decreasing C) Sinusoidal oscillations D) Step response

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

The best method for determining the stability and transient response of a control system is (a) Bode Plot (b) Nyquist plot (c) Root locus (d) Routh-Hurwitz

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

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