Define Phase lag and phase lead?

Define Phase lag and phase lead?
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1 Answer

Answer :

A negative phase angle is called phase lag.
A positive phase angle is called phase lead.
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Related questions

Define Phase lag

Description : Define Phase lag

Last Answer : A negative phase angle is called phase lag.

What are the merits of lag lead network?

Description : What are the merits of lag lead network?

Last Answer : i. Faster response and steady state accuracy. ii. Bandwidth of the system increased. iii. It reduces gain and phase margin can be adjusted.

Define phase lead?

Description : Define phase lead?

Last Answer : A positive phase angle is called phase lead.

What are the basic roles of compensation of lag-led network?

Description : What are the basic roles of compensation of lag-led network?

Last Answer : The use of Lag and Led compensation increase the order of system by one. The use of lag-led compensation increase is the order of the system by two which means that the system becomes more complex. So it is more difficult to control the transient response behavior.

What are the basic roles of compensation of lag network?

Description : What are the basic roles of compensation of lag network?

Last Answer : Lag compensation is essentially yields an appreciable improvement in steady state accuracy at the expense of increase of transient response time.

What are the effects of phase lead compensation?

Description : What are the effects of phase lead compensation?

Last Answer : i. The velocity error constant Kv is usually increased for the given relative stability. ii. The peak resonance Mp will be reduced. iii. Phase margin is increased. iv. Bandwidth is increased. v. Overshoot reduces as peak resonance Mp is reduced.

What are the limitations of phase lead compensation?

Description : What are the limitations of phase lead compensation?

Last Answer : i. The velocity error constant Kv is usually increased for the given relative stability. ii. The peak resonance Mp will be reduced. iii. Phase margin is increased. iv. Bandwidth is increased. v.Overshoot reduces as peak resonance Mp is reduced.

Define Phase cross over?

Description : Define Phase cross over?

Last Answer : The frequency at which, the phase of open loop transfer functions is called phase cross over frequency ω

Phase Margin?

Description : Phase Margin?

Last Answer : Answer: The phase margin is the amount of additional phase lag at the gain cross over frequency required to bring the system to the verge of instability.

What is Phase cross over frequency?

Description : What is Phase cross over frequency?

Last Answer : Answer: The frequency at which the phase of the open loop transfer function is 180o is called the phase cross over frequency.

What is phase margin?

Description : What is phase margin?

Last Answer : The phase margin is the amount of phase lag at the gain cross over frequency required to bring system to the verge of instability.

What is phase margin?

Description : What is phase margin?

Last Answer : The phase margin is the amount of phase lag at the gain cross over frequency required to bring system to the verge of instability.

What is phase margin?

Description : What is phase margin?

Last Answer : The phase margin, ω ired to bring system to the verge of instability.

Define Transfer Function?

Description : Define Transfer Function?

Last Answer : Transfer Function of a control system is defined as: i) Ratio of Laplace transform of Output to the Laplace transform of the Input with zero initial conditions ii) Transfer function is defined as the Laplace transform of Impulse response of the system with zero initial conditions

Define Gain cross over?

Description : Define Gain cross over?

Last Answer : The gain cross over frequency is the frequency at which the magnitude of the open loop transfer function is unity.

Define Relative stability

Description : Define Relative stability

Last Answer : Relative stability is the degree of closeness of the system and it is an indication of strength or degree of stability.

Define Corner frequency?

Description : Define Corner frequency?

Last Answer : The frequency at which the two asymptotic meet in a magnitude plot is called corner frequency.

Define Cut-off rate?

Description : Define Cut-off rate?

Last Answer : The slope of the log-magnitude curve near the cut-off is called cut-off rate. The cut-off rate indicates the ability to distinguish the signal from noise.

Define Corner frequency?

Description : Define Corner frequency?

Last Answer : The frequency at which the two asymptotic meet in a magnitude plot is called corner frequency.

Define Gain cross over?

Description : Define Gain cross over?

Last Answer : The gain cross over frequency is the frequency at which the magnitude of the open loop transfer function is unity.

Define Relative stability

Description : Define Relative stability

Last Answer : Relative stability is the degree of closeness of the system, it is an indication of strength or degree of stability.

Define Corner frequency?

Description : Define Corner frequency?

Last Answer : The frequency at which the two asymptotic meet in a magnitude plot is called corner frequency.

Define Gain cross over?

Description : Define Gain cross over?

Last Answer : The gain cross over frequency ωgc is the frequency at which the magnitude of the open loop transfer function is unity.

Define –Gain Margin?

Description : Define –Gain Margin?

Last Answer : The gain margin, kg is defined as the reciprocal of the magnitude of the open loop transfer

Define Cut-off rate?

Description : Define Cut-off rate?

Last Answer : The slope of the log-magnitude curve near the cut-off is called cut-off rate. The cut-off rate indicates the ability to distinguish the signal from noise.

Define –Resonant frequency

Description : Define –Resonant frequency

Last Answer : The frequency at which resonant peak occurs is called resonant frequency.

Define –resonant Peak

Description : Define –resonant Peak

Last Answer : The maximum value of the magnitude of closed loop transfer function is called resonant peak.

Define Steady state error.

Last Answer : The steady state error is defined as the value of error as time tends to infinity.

Define Settling time.

Description : Define Settling time.

Last Answer : Settling time is defined as the time taken by the response to reach and stay within specified error

Define peak overshoot.

Description : Define peak overshoot.

Last Answer : Peak overshoot is defined as the ratio of maximum peak value measured from the Maximum value to final value

Define peak time.

Description : Define peak time.

Last Answer : The time taken for the response to reach the peak value for the first time is peak time.

Define Rise time.

Description : Define Rise time.

Last Answer : The time taken for response to rise from 0% to 100% for the very first time is rise time.

Define Delay time.

Description : Define Delay time.

Last Answer : The time taken for response to reach 50% of final value for the very first time is called delay time.

Define Damping ratio.

Description : Define Damping ratio.

Last Answer : Damping ratio is defined as the ratio of actual damping to critical damping.

Define BIBO stability.

Description : Define BIBO stability.

Last Answer : A linear relaxed system is said to have BIBIO stability if every bounded input results in a bounded output.

Define thermal resistance.

Description : Define thermal resistance.

Last Answer : The thermal resistance for heat transfer between two substances is defined as the ratio of change in temperature and change in heat flow rate.

Define non touching loop.

Description : Define non touching loop.

Last Answer : The loops are said to be non - touching if they do not have common nodes.

increases the steady state accuracy. (a) Integrator (b) Differentiator (c) Phase lead compensator (d) Phase lag compensator Ans:A 10.As a result of introduction of negative feedback which of the following will not decrease ? (a) Band width (b) Overall gain (c) Distortion (d) Instability

Description : increases the steady state accuracy. (a) Integrator (b) Differentiator (c) Phase lead compensator (d) Phase lag compensator Ans:A 10.As a result of introduction of negative feedback which of the following will not decrease ? (a) Band width (b) Overall gain (c) Distortion (d) Instability

Last Answer : Ans: A

Possible phase relationships between voltage and current in an alternating current circuit include which of the following conditions? A. Current and voltage may be in phase. B. Current may lead the voltage. C. Current may lag the voltage. D. All of the above.

Description : Possible phase relationships between voltage and current in an alternating current circuit include which of the following conditions? A. Current and voltage may be in phase. B. Current may lead the voltage. C. Current may lag the voltage. D. All of the above.

Last Answer : Answer: D

A phase lag lead network introduces in the output?

Description : A phase lag lead network introduces in the output?

Last Answer : A phase lag lead network introduces in the output lag at low frequencies and lead at high frequencies.

Frequency Domain Analysis in Control System

Description : Frequency Domain Analysis in Control System

Last Answer : Frequency Response: The Frequency Response of the system is the steady state response of the system obtained as the output when a sinusoidal input signal is given to the system. For determining the ... of the system, adjust the gain of the control system and helps in designing the control system.

Advantages of Frequency Domain Analysis

Description : Advantages of Frequency Domain Analysis

Last Answer : Advantages of Frequency Domain Analysis Frequency Response Analysis: In frequency response analysis the input to the control system is fed with a sinusoidal signal with different frequencies. The output ... system Frequency domain analysis can also be carried out for the non linear control systems.

PI Controllers in Process System

Description : PI Controllers in Process System

Last Answer : PI controllers are used in many industrial control applications. The main purpose of using Proportional and Integral (PI) in process system is to improve the steady state accuracy of the ... requires higher values of the proportional and integral gains compared to gains required in PI controllers

What is Zero of the system?

Description : What is Zero of the system?

Last Answer : Zero of a function F(s) is a value at which the function F(s) becomes zero, where F(s) is a function of complex variable s.

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Description : What is Pole of the system?

Last Answer : Pole of a function F(s) is the value at which the function F(s) becomes infinite, where F(s) is a function of the complex variable s.

What are Test signals and their significance?

Description : What are Test signals and their significance?

Last Answer : The knowledge of the input signal is required to predict the response of the system. In most of the systems input signals are not known ahead of the time and it is also difficult to ... the control system. The commonly used test signals are impulse, ramp, step signals and sinusoidal signals.

How Time response of the system is divided?

Description : How Time response of the system is divided?

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Description : What is Time response of the control system?

Last Answer : Time response of the control system is defined as the output of the closed loop system as a function of time. Time response of the system can be obtained by solving the differential equations governing the system or time response of the system can also be obtained by transfer function of the system.

What is Order of the system?

Description : What is Order of the system?

Last Answer : Order of the system is defined as the order of the differential equation governing the system. Order of the system can be determined from the transfer function of the system. Also the order of ... function. For nth order system for a particular transfer function contains 'n' number of poles.

Explain Mechanical Translational System?

Description : Explain Mechanical Translational System?

Last Answer : Model of mechanical translational system can be obtained by using three basic elements Mass, Spring and Dash-pot. Weight the mechanical system is represented by mass and is assumed to be ... represented by the spring Friction existing in a mechanical system can be represented by dash-pot.