What is the harmonic filter?

What is the harmonic filter?

It is being used to supress the input voltage distortion at input side of any electrical equipment. This distortion is created by other electrical loads like motor, drives etc nearby connected with same source. Harmonic filter to be designed for a range of harmonics or specific harmonics like 3rd harmonics  5th harmonics, 7th harmonics.

Related questions

Description : The second harmonic distortion is defined as the A) Ratio of amplitude of second harmonic component in the output to that of the fundamental frequency B) Harmonic distortion due to only second harmonic component C) Sum of distortion of first and second harmonic components in the output

Answer : The second harmonic distortion is defined as the Ratio of amplitude of second harmonic component in the output to that of the fundamental frequency

Description : What do you mean by active filter? State its advantages over passive filter . Define pass band & stop band with respect to filter.

Answer : Active Filter: Active Filter is formed by using active element along with the passive components.  Advantages of Active filter over Passive filter: High value of pass band gain can be obtained. It is ... pass band.  Stop Band Filter: The frequency range which is attenuated is known as stop band.

Description : What is harmonic in power quality?

Description : Which capacitors are suitable for DC filter circuits?

Answer : Electrolytic capacitors are suitable for DC filter circuits.

Description : write short notes on Low-pass filter.

Answer : low-pass filter (1) filter exhibiting frequency selective characteristic that allows low-frequency components of an input signal to pass from filter input to output unattenuated all high-frequency components are ... the bandwidth of the filter. A filter whose impulse response is a low-pass signal.

Description : To get minimum harmonic distortion in the output, a 3-Ф to 3-Ф cyclo-converter requires :  (A) 12 SCRs (B) 18 SCRs (C) 36 SCRs (D) 72 SCRs

Answer : To get minimum harmonic distortion in the output, a 3-Ф to 3-Ф cyclo-converter requires : 36 SCRs

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 fractional-pitch used for eliminating 7th harmonic from the emf wave of an alternator is (A) 2/3 (B) 5/6 (C) 7/8 (D) 6/7

Answer : The fractional-pitch used for eliminating 7th harmonic from the emf wave of an alternator is 6/7

Description : Explain the sinusoidal harmonic reduction techniques for cylcoconverters.

Description : What is the function of an electrical filter ?

Answer : Filter separates different components that are mixed together. Electrical filter can separate different frequency components. Electrical filters are the electrical circuits which are use to remove unwanted frequency components from the signal.

Description : What is the convolution filter?

Description : need of rectifier and filter.

Answer : Need of rectifier: Every electronics circuit needs a D.C. power source for its operation. The rectifier circuit is used to convert A.C. supply to unidirectional pulses .  Need of filter: A filter ... only the D.C. components to reach the load. So filter is used to provide ripple free output.

Description : State any four advantages of LC filter.

Answer : 1. The choke input (LC) filter has a high output D.C voltage. 2. It has no loading effect on the rectifier and power transformer.  3. The diode does not have to carry surge currents.  ... effect on the rectifier and power transformer.  7. It has better voltage regulation than that of π filter.

Description : Compare RC and LC filter.

Answer : RC filters  LC filters The RC filter is only useful for small load currents. The LC filters are useful for heavy load currents. More power dissipated in RC filter. Less power ... RC is fine for filtering low power signals. LC is fine for filtering high power signals.

Description : Explain design constraint of filter inductor design.

Description : For a prototype low pass filter, the series and shunt elements are respectively _____.

Answer :  For a prototype low pass filter, the series and shunt elements are respectively inductive and capacitive.

Description : The ripple factor in an LC filter.   (A) Increases with the load current (B) Increases with the load resistance (C) Remains constant with the load current (D) Has the lowest value

Answer : The ripple factor in an LC filter. Has the lowest value

Description : The values of L and C for a low pass filter with cut off frequency of 2.5 KHz and operating with a terminated load resistance of 450 Ohm are given by  (a) 57.3 mH; 0.283 μF (b) 28.66 μH; 0.14 μF (c) 114.64 mH; 0.566 mF (d) 50.23 mH; 0.632 mF

Answer : The values of L and C for a low pass filter with cut off frequency of 2.5 KHz and operating with a terminated load resistance of 450 Ohm are given by 57.3 mH; 0.283 μF

Description : A band pass filter is that which

Answer : A band pass filter is that which passes signals between two frequency limits

Description : Low pass filter with cut off frequency of 100 kHz and high pass filter with cut off frequency of 50 kHz are connected in tandem, the resultant filter is Low pass filter with cut off frequency of 100 kHz ... kHz Band pass filter with pass band from 50 kHz to 100 kHz. None of the above.

Answer : Low pass filter with cut off frequency of 100 kHz and high pass filter with cut off frequency of 50 kHz are connected in tandem, the resultant filter is Band pass filter with pass band from 50 kHz to 100 kHz.

Description : Prior to sampling an anti-aliasing filter is used.

Answer : Prior to sampling an anti-aliasing filter is used. It is used to attenuate the high frequency component of the Signal

Description : Rectification efficiency of a full wave rectifier without filter is nearly equals to:  (1) 51% (2) 61% (3) 71% (4) 81%

Answer : Rectification efficiency of a fullwave rectifier without filter is nearly equals to: 81%

Description : A twin T network is a filter of kind  A) BEF B) LPF C) HPF D) BPF

Description : Maximum phase distortion is encountered when using the filter approximation  A) Elliptic B) Butterworth C) Chebyshev I D) Inverse Chebyshev

Description : Angles in degrees of pole locations of 4th order Butterworth low pass filter approximation from either real axis are  A) +45,-45,+30,-30 B) +67.5,-67.5,+45,-45 C) +30,-30,+22.5,-22.5 D) +67.5,-67.5,+22.5,-22.5

Description : What is the effect of following on induction motors: (1) Voltage unbalance (2) Harmonic distortion

Answer : i) Effect of voltage unbalance: For three phase motors this leads to unequal currents in the three phase windings that result in unbalance in the fields produced due to which negative phase ... currents thereon). This leads to motor failures, lower life and improper torque speed characteristics.

Description : A body which is attached to a spring undergoes simple harmonic motion. The magnitude of the body's acceleration is: w) constant x) proportional to its displacement from its equilibrium position y) zero z) always increasing.

Answer : ANSWER: X -- PROPORTIONAL TO ITS DISPLACEMENT FROM ITS EQUILIBRIUM POSITION

Description : Imagine that a 20 mile diameter hole is bored along the diameter of the Earth extending from the North Pole to the South Pole, that all air and gases are pumped out of this hole, and that the temperature ... between the loci of the hole with the opposite surfaces of the Earth. z) none of the above.

Answer : ANSWER: Y -- FOREVER OSCILLATE IN SIMPLE HARMONIC MOTION ALONG THE OLE

Description : The equation, X = A cos(wt + f) (read: X equals A times the cosine of omega t + phi (fee)), can represent an expression for: w) accelerating due to gravity x) uniform straight line motion y) dc current z) a simple harmonic oscillator

Description : The period of oscillation of a particle undergoing simple harmonic motion is: w) independent of the amplitude of the motion x) directly proportional to the frequency of oscillation y) independent of the frequency of oscillation z) none of the above

Answer : ANSWER: W -- INDEPENDENT OF THE AMPLITUDE OF THE MOTION

Description : In simple harmonic motion, the acceleration is: w) constant x) proportional to the distance from the central position y) greatest when the velocity is greatest z) none of the above

Answer : ANSWER: X -- PROPORTIONAL TO THE DISTANCE FROM THE CENTRAL POSITION

Description : Which of the following statements dealing with simple harmonic motion of a mass-spring system is TRUE? w) The acceleration is largest when the oscillating mass is instantaneously at rest. x) The ... of the motion. z) The acceleration is larger when the oscillating mass has its greatest velocity.

Answer : ANSWER: W -- THE ACCELERATION IS LARGEST WHEN THE OSCILLATING MASS IS INSTANTANEOUSLY AT REST

Description : Which of the following is an example of simple harmonic motion? (1) Earth spinning on its axis (2) Simple pendulum motion (3) Ball bouncing on floor (4) Motion of a ceiling fan

Description : The motion of a body that repeats itself after a regular interval of time is (1) a periodic motion (2) a simple harmonic motion (3) an aperiodic motion (4) an oscillatory motion

Description : According to Malthusian theory of population (1) Population increases in geometric ratio, food supply increases in arithmetic ratio (2) Population increases in arithmetic ratio, food supply increases in ... (4) Population increases in a harmonic ratio, food supply increases in a arithmetic ratio

Answer : Population increases in geometric ratio, food supply increases in arithmetic ratio

Description : Define simple harmonic motion. Give its two example.

Answer : Simple harmonic motion: The to and fro motion of the object about its mean position is called simple harmonic motion.  Examples: motion of swing, motion of sewing machine , motion of clock pendulum , etc.

Description : The synchronous speed for the seventh space harmonic mmf wave of a 3-phase, 8-pole, 50 Hz induction machine is  (A) 107.14 rpm in forward direction (B) 107.14 rpm in reverse direction (C) 5250 rpm in forward direction (D) 5250 rpm in reverse direction

Answer : The synchronous speed for the seventh space harmonic mmf wave of a 3-phase, 8-pole, 50 Hz induction machine is 107.14 rpm in forward direction

Description : In single pulse modulation of PWM inverters, third harmonic can be eliminated if pulse width is equal to   (a) 30o (b) 60o (c) 120o (d) 150o

Answer : In single pulse modulation of PWM inverters, third harmonic can be eliminated if pulse width is equal to 120o

Description : Harmonic distortion of the signal is produced in an RC coupled transistor amplifier. The probable component responsible for this distortion is  (A) The transistor itself  (B) the power supply Vcc  (C) the coupling capacitor Cc  (D) the biasing resistors

Answer : Harmonic distortion of the signal is produced in an RC coupled transistor amplifier. The probable component responsible for this distortion is The transistor itself

Description : A rectangular waveform has fifth harmonic amplitude (a) same as that of fundamental (b) 0.2 times that of fundamental (c) 0.4 times that of fundamental (d) 5 times that of fundamental

Description : A square wave has a period of 60 s. The first odd harmonic is: A. 5 kHz B. 50 kHz C. 500 kHz D. 33.33 kHz

Answer : A square wave has a period of 60 s. The first odd harmonic is: 50 kHz

Answer : Harmonic distortion is due to Non-linear behaviour of circuit elements

Description : The order of the sub-harmonic during SSR for 50 Hz nornal frequency is

Description : What are filter aid. What should be qualities of filter aid?

Answer : Filter Aid: These are the substance which reduces the resistance of filtrate to flow. Ideal qualities of filter aid:  i. It should be remain suspended in the liquid. ii. It should be free ... suitable for retention of solid. v. It should have structure that permits formation of porous cake.

Description : What is the significance of signal conditioner? Explain the need of following in mechatronics system. i) Isolator ii) Filter iii) Amplifier iv) Data converter

Answer : Significance: Signal conditioning means manipulating an analog signal in such a way that it meets the requirements of the next stage for further processing. Signal inputs accepted by signal ... -frequency converters, current-to-voltage converters, current loop converters, and charge converters.

Description : Explain the operation of a full wave bridge rectifier with π filter using a neat diagram. Draw input and output waveforms.

Answer : During positive half-cycle of input, the secondary voltage VAB is positive, so diodes D1 and D2 forward biased and D3 and D4 reverse biased. The load current flows from terminal A ... smooth DC voltage appears across the load. The input and output waveforms are shown in the figure.

Description : Define filter and state it’s types.

Answer : A filter circuit may be defined as a circuit, which removes (or minimizes)the unwanted a.c. component of the rectifier output and allows only the d.c. component to reach the load. Types of filters 1) ... 2) Choke input filter(series inductor filter) 3) LC filter 4) π Filter 5) RC filter

Description : Draw and explain: bridge rectifier with shunt capacitor filter.

Answer : Operation of bridge rectifier with capacitor filter is explained in different intervals with the help of the following wave form. Operation in interval at 0 to A: ... filter is very close to theideal dc voltage waveform as most of the ripple is removed from rectified output.

Description : Draw a well labelled diagram of filter candle. Give its working and disadvantages.

Answer : Diagram : Working  : The filter candle is placed in a vessel containing the liquid to be filtered. When vacuum is applied, the pressure inside the candle is decreased. Due to ... Disadvantages   1. Chance of clogging/blocking. 2. Traces of material may come in the solution.

Description : Write the working of filter press with well labelled diagram.

Answer : Working:  1. The slurry is pumped in under positive pressure up to 20 bar and fill each frame. 2. The filtrate passes through the cloths on opposite sides of the frame and runs down between the ... 6. Thickness of cake can be varied by using frame of different thickness. Diagram:

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