# Linear Time Invariant (LTI) System

Linear Time Invariant (LTI) System

Linear Time Invariant System

•Linear system means a system which possesses the property of superposition.

•Time invariant system means its behavior and characteristics are fixed over time.

•Before knowing Linear Time Invariant (LTI) system we should know what is convolution, Laplace transform and Fourier transform.

•Convolution is the mathematical way combining two signals to form third signal.

•Laplace transform is use to find transfer function by taking Laplace transform of output upon Laplace transform of input.

•Fourier transform is having the similar relation like Laplace transform.

•We can get the transfer function from the impulse response.

•Impulse response is related to frequency response via Fourier transform.

## Related questions

Description : What is the meaning of LTI system?

Answer : The system which satisfies both linearity and time invarient is called linear time invarient (LTI) systrm

Description : Linear Algebra Problem the solution to the system of equations

Answer : Linear Algebra Problem the solution to the system of equations https://youtu.be/y_FlupirxZM

Description : A system is linear if and only if it satisfies

Answer : A system is linear if and only if it satisfies principle of superposition and principle of homogeneity

Description : 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

Answer : 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

Description : If the displayed system time and date is wrong, you can reset it using :  (A) Task bar (B) Menu bar (C) Desk top (D) Control panel

Answer : If the displayed system time and date is wrong, you can reset it using : Control panel

Description : With fault clearing time, the transient stability of a power system

Answer : With fault clearing time, the transient stability of a power system decreases

Description :

What is a time variant system?

Description : What is a hard real time system?

Answer : If the real-time systems have minimum interrupt latency and task deadline with prescribe time limits then it is known as hard real-time systems.  If these two requirements meet in real time systems but not always then it is known as soft real-time systems.

Description : 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

Answer : 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 ... given below : (a) 1 only (b) 2 only (c) 3 only (d) 1, 2 and 3

Description : A linear network has a current input 4cos(ω t + 20º)A and a voltage output 10 cos(ωt +110º) V. Determine the associated impedance.

Description :

Description : What are ‘Linear actuators’ ? State applications.

Answer : What are ‘Linear actuators’ ? State applications.

Description : Linear algebra problem: Rank of a matrix

Answer : Linear algebra problem: Rank of a matrix https://youtu.be/b7tPLA3_y6Y

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Answer : Answer : Linear algebra problem: The determinant of the matrix

Description : Linear Algebra Problem 2

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Answer : Linear Algebra Problem The product of eigen values of the matrix https://youtu.be/JGcynUZFQ78

Description : Linear and non-linear device

Answer : Linear and non-linear device

Description : A network contains linear resistors and ideal voltage sources. If values of all the resistors are doubled then the voltage across each resistor will

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Description : Which of the following converts linear displacement from a mechanical reference into a proportional electrical signal containing phase and amplitude information? A) CRO B) LVDT C) RVDT D) None of these

Answer : Which of the following converts linear displacement from a mechanical reference into a proportional electrical signal containing phase and amplitude information? A) CRO B) LVDT C) RVDT D) None of these

Description : The power flow problem mathematical model for a linear transmission network (A) is non-linear (B) is linear (C) considers time variation of generation (D) does not consider tap-changing transformers

Answer : The power flow problem mathematical model for a linear transmission network is non-linear

Description : What do you mean by linear convolution?

Description : Is a convolution linear?

Description : What is the difference between linear and nonlinear electrical loads?

Description :

What is a non linear load?

Description :

Why do non linear loads cause harmonics?

Description : What are the disadvantages of the linear regulator? how are they overcome in the switching regulator? What is continuous and discontinuous mode switching regulator?

Answer : Disadvantages of the linear regulator: Linear regulator waste power in the form of heat. Linear regulator has very low efficiency. Linear regulator cannot be used for the step ... between continuous mode and discontinuous mode switching regulator.

Description : write short notes on Linear motor.

Answer : Normal electrical motor produces rotatory motion same the linear motor produces linear motion. Linear motors have low efficiency. Linear motor can directly produce straight line motion linear motor do not required gears or crank shaft to produce linear motion.

Description : what is linear regulator?

Description : If non-linear loads are connected to the power system, then (A) displacement power factor is same as the total power factor (B) displacement power factor is not equal to the total power factor (C) displacement power factor is due to harmonic currents (D) total power factor is due to fundamental component of current

Answer : If non-linear loads are connected to the power system, then displacement power factor is not equal to the total power factor

Description : Explain slotted time quick return mechanism with neat sketch.

Answer : The slotted lever quick return mechanism is illustrated in Figs. a and b The crank AB (of adjustable length R) rotates with a uniform angular speed. The crank pin B is in the shape of a die block ... Fig. (b)) and the return stroke is completed in less time which is proportional to angle β.

Description :

Answer : It is denoted as τ, tau and has the value of 1/RC. We

Description :

Description : sketch time period measurement by CRO.

Answer : Horizontal sweep is turned ON and the display appealing on the screen is adjusted by varying different control knobs provided on the front panel of CRO, till the signal is suitably displayed ... Where m=Number of division in one complete cycle n=Setting of time base =Time/Division

Description :

Time constant for RC circuit formula

τ = RC

Where, τ = time constant

Answer : Time constant for RC circuit formula τ = RC Where, τ = time constant

Description :

What is Time of Day tariff? How it help in energy conservation?

Answer : Time-off-day tariff:- In addition to basic tariff (Maximum Demand Tariff / KVA Maximum Demand Tariff / Load factor tariff /also the tariff in which P.F. of industrial consumer is taken ... the rated load for longer times of the day their overall efficiency gets higher helping to conserve energy.

Description : Define: 1) frequency, 2) cycle, 3) time period, 4) amplitude

Answer : 1) frequency: The total number of cycles completed in one second is called frequency. Its unit is cycles per second or Hertz (Hz). Its formula is f = 1/ T, where T is time period. ... is second per cycle. 4) amplitude: the maximum instantaneous value of sine wave is called as amplitude.

Description : The average time required to reach a storage location in the memory to read or retrieve the contents of memory is called as A) Turnaround time B) Latency time C) Access time D) Response time

Answer : The average time required to reach a storage location in the memory to read or retrieve the contents of memory is called as Access time

Description : What is the Fourier transform of a Gaussian time pulse? A) Uniform B) Gaussian C) Impulses D) Pulse

Answer : What is the Fourier transform of a Gaussian time pulse? A) Uniform B) Gaussian C) Impulses D) Pulse

Description : The operating time of instantaneous relay is

Answer : The operating time of instantaneous relay is 0.1 sec

Description : The time base signal in Cathode Ray Oscilloscope (CRO) is  (1) A square wave signal (2) A sawtooth signal (3) A triangular wave signal (4) A sinusoidal signal

Description : In electric traction for a trapezoidal speed-time curve, the time period is (A) free running speed period = constant speed period (B) free running period = coasting period (C) free running period + coasting period = constant speed period (D) average speed period = scheduled speed period

Answer : In electric traction for a trapezoidal speed-time curve, the time period is free running period + coasting period = constant speed period

Description : The time period of third harmonic of power supply frequency, in milliseconds, is (A) 20 (B) 3.33 (C) 6.66 (D) 60

Answer : The time period of third harmonic of power supply frequency, in milliseconds, is 6.66

Description : The time constant of the servo-mechanism can be decreased by

Answer : The time constant of the servo-mechanism can be decreased by decreasing the inertia of the system

Description : ln HRC fuse the time between cut-off and final current zero is called

Answer : ln HRC fuse the time between cut-off and final current zero is called the arcing time

Description : The time constant of a series R-C circuit is given by?

Answer : The time constant of a series R-C circuit is given by RC.

Description :

Time constant of a capacitive circuit?

Answer : Time constant of a capacitive circuit increase with increase of capacitance and increase of resistance.

Description :

Time constant of a circuit is the time in seconds taken after the application of voltage to each?

Answer : Time constant of a circuit is the time in seconds taken after the application of voltage to each 63% of maximum value.

Description : The time constant of the capacitance circuit is defined as the time during which voltage?

Answer : The time constant of the capacitance circuit is defined as the time during which voltage rises to 63.2% of its final steady value.

Description :

Time constant of an inductive circuit?

Answer : Time constant of an inductive circuit increases with increase of inductance and decrease of resistance.

Description :

For a frequency of 200 Hz, the time period will be?

Answer : For a frequency of 200 Hz, the time period will be 0.005 s.

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