Sarthaks eConnect | Largest Online Education Community - Recent questions and answers in Electronics
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Managed by Sarthaks eConnectA 3-phase, 50 Hz, 160 km long overhead line supplies 1000 kW at 11 k V, 0·8 p.f. lagging. The line resistance is 0· 0 05 Ω per phase per km
https://www.sarthaks.com/1067233/phase-160-long-overhead-line-supplies-1000-08-lagging-the-line-resistance-05-per-phase-per
<p>A 3-phase, 50 Hz, 160 km long overhead line supplies 1000 kW at 11 k V, 0·8 p.f. lagging. The line resistance is 0· 0 05 Ω per phase per km and line inductance is 0·05 mH per phase per km, the line susceptance is 10<sup>-05</sup> S per phase per km. Calculate the sending end voltage, voltage regulation and efficiency of transmission</p>Electronicshttps://www.sarthaks.com/1067233/phase-160-long-overhead-line-supplies-1000-08-lagging-the-line-resistance-05-per-phase-perMon, 12 Apr 2021 07:41:12 +0000A string of 5 insulators is connected across a 100 kV line. If the capacitance of each disc to earth is 0-1
https://www.sarthaks.com/1067059/string-insulators-is-connected-across-100-kv-line-if-the-capacitance-of-each-disc-earth-is
A string of 5 insulators is connected across a 100 kV line. If the capacitance of each disc to earth is 0.1 of the capacitance of the insulator, calculate (i) the distribution of voltage on the insulator discs and (ii) the string efficiency.Electronicshttps://www.sarthaks.com/1067059/string-insulators-is-connected-across-100-kv-line-if-the-capacitance-of-each-disc-earth-isSun, 11 Apr 2021 18:30:26 +0000Pmmc instrument
https://www.sarthaks.com/1066398/pmmc-instrument
Pmmc instrument has a full scale deflecting of 90 for a 2A.the deflecting torque is directly proportional to the current passing via the moving coil.find the current required for a deflecting of 60 if the instrument is, (A. Spring controlled And, (b. Gravity controlledElectronicshttps://www.sarthaks.com/1066398/pmmc-instrumentSat, 10 Apr 2021 01:56:48 +0000Electromagnetism
https://www.sarthaks.com/1059035/electromagnetism
Electronicshttps://www.sarthaks.com/1059035/electromagnetismSun, 28 Mar 2021 08:16:01 +0000Answered: what is electronics?
https://www.sarthaks.com/1055579/what-is-electronics?show=1056068#a1056068
<p><strong>Analogue electronics</strong> are electronic systems with a continuously variable signal, in contrast to digital electronics where signals usually take only two levels. The term "analogue" describes the proportional relationship between a signal and a voltage or current that represents the signal. The word analogue is derived from the Greek word analogos meaning proportional.</p>Electronicshttps://www.sarthaks.com/1055579/what-is-electronics?show=1056068#a1056068Tue, 23 Mar 2021 15:07:41 +0000Determine the total complex power
https://www.sarthaks.com/1055877/determine-the-total-complex-power
a balanced star connected three phase generator with phase voltage 200v supplies an unbalanced star connected load with impedance (7+3j),(4-9j),(8-6j). Determine the total complex power.<br />
<br />
This is full questionElectronicshttps://www.sarthaks.com/1055877/determine-the-total-complex-powerTue, 23 Mar 2021 10:38:23 +0000Analog Electronics Circuit
https://www.sarthaks.com/1054732/analog-electronics-circuit
Explain in detail the working mechanism of NPN transistor in active region. Draw the Common Emitter Input and Output characteristics.Electronicshttps://www.sarthaks.com/1054732/analog-electronics-circuitSun, 21 Mar 2021 17:02:53 +0000Differential equations
https://www.sarthaks.com/1054550/differential-equations
Solve (x2<br />
-4xy) dx + (y2<br />
-4xy) dy = 2y2 dx + 2x2 dyElectronicshttps://www.sarthaks.com/1054550/differential-equationsSun, 21 Mar 2021 02:41:51 +0000Four circuit elements are connected in series across a sinusoidal alternating voltage
https://www.sarthaks.com/1051737/four-circuit-elements-are-connected-in-series-across-a-sinusoidal-alternating-voltage
Electronicshttps://www.sarthaks.com/1051737/four-circuit-elements-are-connected-in-series-across-a-sinusoidal-alternating-voltageSun, 14 Mar 2021 16:12:30 +0000Special OPAMP CALCULATION
https://www.sarthaks.com/1051709/special-opamp-calculation
<p><img alt="Help me to solve this" src="https://www.sarthaks.com/?qa=blob&qa_blobid=12944778268652048093" style="height:597px; width:600px"></p>Electronicshttps://www.sarthaks.com/1051709/special-opamp-calculationSat, 13 Mar 2021 14:47:39 +0000Reduce following function using k map
https://www.sarthaks.com/1049195/reduce-following-function-using-k-map
F(A,B,C,D)=π(0,1,2,3,8,9,10,11,12,13)Electronicshttps://www.sarthaks.com/1049195/reduce-following-function-using-k-mapTue, 09 Mar 2021 12:53:19 +0000Derive the expression for voltage gain of instrumentation amplifier for a resistive transducer
https://www.sarthaks.com/1048635/derive-the-expression-for-voltage-gain-instrumentation-amplifier-resistive-transducer
Electronicshttps://www.sarthaks.com/1048635/derive-the-expression-for-voltage-gain-instrumentation-amplifier-resistive-transducerTue, 09 Mar 2021 05:43:21 +0000how could we find the equivalent resistance in a circuit having different series and parallel combinations of resistors in it??
https://www.sarthaks.com/1047647/equivalent-resistance-circuit-having-different-series-parallel-combinations-resistors
Electronicshttps://www.sarthaks.com/1047647/equivalent-resistance-circuit-having-different-series-parallel-combinations-resistorsSat, 06 Mar 2021 17:59:02 +0000Find the current in 2.5 resistor
https://www.sarthaks.com/1046831/find-the-current-in-2-5-resistor
<p><img alt="" src="https://www.sarthaks.com/?qa=blob&qa_blobid=6169404419459419725" style="height:379px; width:525px"></p>Electronicshttps://www.sarthaks.com/1046831/find-the-current-in-2-5-resistorFri, 05 Mar 2021 09:36:07 +0000Wave particle paradox
https://www.sarthaks.com/1046442/wave-particle-paradox
An x-ray with a wavelength of 0.1 nm collides with an electron that is initially at rest. The<br />
x-ray’s final wavelength is 0.119 nm. What is the final kinetic energy of the electronElectronicshttps://www.sarthaks.com/1046442/wave-particle-paradoxThu, 04 Mar 2021 16:43:05 +0000Explain how a DMM and CRO be used to measure voltage across and current through a 1kohm resistor
https://www.sarthaks.com/1046441/explain-how-dmm-and-cro-be-used-measure-voltage-across-and-current-through-1kohm-resistor
OhmElectronicshttps://www.sarthaks.com/1046441/explain-how-dmm-and-cro-be-used-measure-voltage-across-and-current-through-1kohm-resistorThu, 04 Mar 2021 16:23:57 +0000Explain the working of R-2R ladder D/A converter with example having 3 bit, 4 bit and 5 bit input sequence with a reference voltage of - 5V
https://www.sarthaks.com/1046440/explain-working-ladder-converter-example-having-input-sequence-with-reference-voltage
Electronicshttps://www.sarthaks.com/1046440/explain-working-ladder-converter-example-having-input-sequence-with-reference-voltageThu, 04 Mar 2021 16:21:17 +0000ما هو النتائج
https://www.sarthaks.com/1046064/
Q: An audio signal transmitted from a radio station has a bandwidth of 10kHz is passed through a Band Pass Filter with a centre frequency of 1000 MHz after getting multiplied by cos wct to produce Xc(t):I- Sketch the spectrum at each point.II- Find the value of wc, if you know that the carrier frequency is only 20% of Xc(t) bandwidth.III- Is there any type of modulation you studied corresponds to this modulator.IV- What will occur when remove the BPF (the Band Pass Filter).V- Suggest a method to regenerate the audio signal at the receiver radio (Car, House…etc.).Electronicshttps://www.sarthaks.com/1046064/Wed, 03 Mar 2021 12:56:09 +00003 phase star connected
https://www.sarthaks.com/1044633/3-phase-star-connected
3 phase 440 v is connected to 3 star connected resistance such that the voltage across two of them are equal in magnitude and differ in phase by 100 degreeElectronicshttps://www.sarthaks.com/1044633/3-phase-star-connectedSat, 27 Feb 2021 04:37:51 +0000Answered: Resistance of a circuit
https://www.sarthaks.com/1043268/resistance-of-a-circuit?show=1043413#a1043413
<p><img alt="" src="https://www.sarthaks.com/?qa=blob&qa_blobid=6521678162222167938" style="height:800px; width:600px">solve the Wheatstone bridge after that it is simple combination of parallel and series resistances </p>Electronicshttps://www.sarthaks.com/1043268/resistance-of-a-circuit?show=1043413#a1043413Tue, 23 Feb 2021 17:44:15 +0000Thevenin's theorem
https://www.sarthaks.com/1041619/thevenins-theorem
<p><img alt="" src="https://www.sarthaks.com/?qa=blob&qa_blobid=2242569162480790211" style="height:176px; width:99px"></p>Electronicshttps://www.sarthaks.com/1041619/thevenins-theoremSun, 14 Feb 2021 22:09:32 +0000Thevenin's theorem
https://www.sarthaks.com/1041618/thevenins-theorem
<p><img alt="" src="https://www.sarthaks.com/?qa=blob&qa_blobid=3203978745329609698" style="height:1773px; width:999px"><img alt="" src="https://www.sarthaks.com/?qa=blob&qa_blobid=3446030841513658738" style="height:1065px; width:600px"></p>Electronicshttps://www.sarthaks.com/1041618/thevenins-theoremSun, 14 Feb 2021 22:06:39 +0000Transfer 12th
https://www.sarthaks.com/1039995/transfer-12th
Electronicshttps://www.sarthaks.com/1039995/transfer-12thThu, 11 Feb 2021 03:26:12 +0000Construct The K map and find the minimum SOP expression
https://www.sarthaks.com/1039779/construct-the-k-map-and-find-the-minimum-sop-expression
Construct the K map and find the minimum SOP expression for Z = W’X’Y + W’XY’ + WX’Y + WXYElectronicshttps://www.sarthaks.com/1039779/construct-the-k-map-and-find-the-minimum-sop-expressionTue, 09 Feb 2021 18:48:31 +0000find the current necessary to produce this flux
https://www.sarthaks.com/1039213/find-the-current-necessary-to-produce-this-flux
An iron ring has a cross-sectional area of 400 mm2 and a mean diameter of 250 mm. An air gap of 1 mm<br />
has been made by a saw-cut across the section of the ring. If a magnetic flux of 0·3 mWb is required in<br />
the air gap, find the current necessary to produce this flux when a coil of 400 turns is wound on the ring.<br />
The iron has a relative permeability of 500.Electronicshttps://www.sarthaks.com/1039213/find-the-current-necessary-to-produce-this-fluxMon, 08 Feb 2021 06:58:22 +0000Calculate the m.m.f. required.
https://www.sarthaks.com/1039209/calculate-the-m-m-f-required
It is required to produce a flux density of 0·6 Wb/m2 in an air gap having a length of 8 mm. Calculate the m.m.f. required.Electronicshttps://www.sarthaks.com/1039209/calculate-the-m-m-f-requiredMon, 08 Feb 2021 06:51:11 +0000Answered: What is CVV?
https://www.sarthaks.com/1039043/what-is-cvv?show=1039083#a1039083
<p><span style="color:#000000"><strong>A card verification value or a CVV numbe</strong>r is a 3-digit code printed at the back of a credit or a debit card. Also known as card security code or card verification code, it acts as an additional security layer protecting your data during online transactions or card swipes at POS machines.</span></p><p><span style="color:#000000">The CVV code is distinct from the card’s PIN and is required while making online transactions. Cardholders must protect their CVV and not share it with anyone to avoid falling prey to cyber frauds.</span></p>Electronicshttps://www.sarthaks.com/1039043/what-is-cvv?show=1039083#a1039083Mon, 08 Feb 2021 04:05:26 +0000Answered: What are the values of circuit constants?
https://www.sarthaks.com/1038492/what-are-the-values-of-circuit-constants?show=1038786#a1038786
<p><span style="color:#000000">(i) Z = √(R<sup>2</sup> + (2π x 50L)<sup>2</sup>) = √(R<sup>2</sup> + 98696L<sup>2</sup>);</span></p><p><span style="color:#000000">V = IZ or 10 = 700 x 10<sup>-3</sup>√(R<sup>2</sup> + 98696L<sup>2</sup>)</span></p><p><span style="color:#000000">√(R<sup>2 </sup>+ 98696L<sup>2</sup>) = 10/700 × 10<sup>−3</sup> = 100/7 </span></p><p><span style="color:#000000">or R<sup>2</sup> + 98696 L<sup>2</sup> = 10000/49 ...(i)</span></p><p><span style="color:#000000">(ii) In the second case Z = √(R<sup>2</sup> + (2π x 75L)<sup>2</sup>) = √(R<sup>2</sup> + 222066L<sup>2</sup>)</span></p><p><span style="color:#000000">∴ 10 = 500 x 10<sup>-3</sup>√(R<sup>2</sup> + 222066L<sup>2</sup>) i.e √(R<sup>2</sup> + 222066L<sup>2</sup>) = 20 or R<sup>2</sup> + 222066L<sup>2</sup> = 400 (ii)</span></p><p><span style="color:#000000">Subtracting Eq. (i) from (ii), we get </span></p><p><span style="color:#000000">222066 L<sup>2 </sup>− 98696 L<sup>2</sup> = 400 − (10000/49) or 123370 L<sup>2</sup> = 196 </span></p><p><span style="color:#000000">or L = 0.0398 H = 40 mH. </span></p><p><span style="color:#000000">Substituting this value of L in Eq. (ii), we get, R<sup>2</sup> + 222066 (0.398)<sup>2 </sup> = 400 </span></p><p><span style="color:#000000">∴ R = 6.9 Ω</span></p>Electronicshttps://www.sarthaks.com/1038492/what-are-the-values-of-circuit-constants?show=1038786#a1038786Sat, 06 Feb 2021 07:55:59 +0000Answered: resistance and p.f.
https://www.sarthaks.com/1038491/resistance-and-p-f?show=1038752#a1038752
<p><span style="color:#000000">In L-R series circuit current lags the voltage by an angle,</span></p><p><span style="color:#000000"><img alt="" src="https://www.sarthaks.com/?qa=blob&qa_blobid=7144176473517399607" style="height:337px; width:398px"></span></p>Electronicshttps://www.sarthaks.com/1038491/resistance-and-p-f?show=1038752#a1038752Sat, 06 Feb 2021 07:31:34 +0000Answered: In a BJT, if the collector-base junction and the base-emitter junction are both reverse-biased, which region is the BJT operating in
https://www.sarthaks.com/1037631/collector-base-junction-base-emitter-junction-both-reverse-biased-which-region-operating?show=1037633#a1037633
If the collector-base junction and the base-emitter junction are both reverse-biased, then the BJT functions in the cut off region of the output characteristics.Electronicshttps://www.sarthaks.com/1037631/collector-base-junction-base-emitter-junction-both-reverse-biased-which-region-operating?show=1037633#a1037633Thu, 04 Feb 2021 09:07:54 +0000Transformers
https://www.sarthaks.com/1037434/transformers
A 500kVa,6000/4000V star-star,three phase 50Hz transformer has an iron loss of 1500W.The maximum efficiency occurs at 0.75 full load.Determine the efficiency of the transformer at full load and 0.8 power factor laggingElectronicshttps://www.sarthaks.com/1037434/transformersThu, 04 Feb 2021 05:09:39 +0000Determine the phasor current in each line, the power consumed per phase, phasor sum of the three line currents.
https://www.sarthaks.com/1037368/determine-the-phasor-current-each-line-the-power-consumed-phase-phasor-three-line-currents
A 220-V, 3- φ voltage is applied to a balanced delta-connected 3- φ load of phase impedance (18 + j24) Ω. Determine (i) the phasor current in each line, (ii) the power consumed per phase (c) phasor sum of the three line currents.Electronicshttps://www.sarthaks.com/1037368/determine-the-phasor-current-each-line-the-power-consumed-phase-phasor-three-line-currentsWed, 03 Feb 2021 16:50:52 +0000Crank mechanism
https://www.sarthaks.com/1036797/crank-mechanism
A petrol engine of cylinder diameter 100mm and stroke 120mm has a piston of mass 1.1kgElectronicshttps://www.sarthaks.com/1036797/crank-mechanismTue, 02 Feb 2021 16:36:43 +0000Urgent Q about electronics
https://www.sarthaks.com/1035992/urgent-q-about-electronics
<p><span style="color:#000000">All the transistor given in the following circuit are identical. What is the ratio of the current I<sub>x</sub>/I<sub>y</sub>,</span></p><p><span style="color:#000000"><img alt="" src="https://www.sarthaks.com/?qa=blob&qa_blobid=8839263131381694078" style="height:444px; width:600px"></span></p>Electronicshttps://www.sarthaks.com/1035992/urgent-q-about-electronicsMon, 01 Feb 2021 09:39:07 +0000The main three power generator in the west bank are located in
https://www.sarthaks.com/1032902/the-main-three-power-generator-in-the-west-bank-are-located-in
The main three power generator in the west bank are located inElectronicshttps://www.sarthaks.com/1032902/the-main-three-power-generator-in-the-west-bank-are-located-inTue, 26 Jan 2021 21:40:55 +0000find V(0) at this circuit
https://www.sarthaks.com/1032872/find-v-0-at-this-circuit
<p><img alt="" src="https://drive.google.com/drive/u/0/my-drive"></p>Electronicshttps://www.sarthaks.com/1032872/find-v-0-at-this-circuitTue, 26 Jan 2021 09:09:59 +0000Answered: ammeer and voltmeter connection
https://www.sarthaks.com/1030266/ammeer-and-voltmeter-connection?show=1032284#a1032284
<p><strong>Ammeter</strong> is used to measure electric current in a circuit, so it is connected in <u><strong>series</strong></u> as the internal resistance of ammeter is very low(zero) so if it is connected in parallel the it will draw maximum current and will get damaged. so it is connected in series.</p><p><strong>Voltmeter</strong> is used to measure electrical potential difference between two points in an electric circuit, internal resistance of voltmeter is very high(infinite)therefore it is connected in <u><strong>parallel.</strong></u> If voltmeter is connected in series it would increase the equivalent resistance of circuit so no current will flow through the circuit. that's why it is connected in parallel so that it won't disturb the equivalent resistance and flow of current of the circuit.</p>Electronicshttps://www.sarthaks.com/1030266/ammeer-and-voltmeter-connection?show=1032284#a1032284Sun, 24 Jan 2021 08:04:48 +0000Answered: What is transistor?
https://www.sarthaks.com/1030806/what-is-transistor?show=1030876#a1030876
<p><span style="color:#000000">A transistor is a type of a semiconductor device that can be used to both conduct and insulate electric current or voltage. A transistor basically acts as a switch and an amplifier. In simple words, we can say that a transistor is a miniature device that is used to control or regulate the flow of electronic signals.</span></p>Electronicshttps://www.sarthaks.com/1030806/what-is-transistor?show=1030876#a1030876Wed, 20 Jan 2021 12:35:48 +0000Calculate current through 200 ohm resistance by applying thevenin's theorem
https://www.sarthaks.com/1028327/calculate-current-through-200-ohm-resistance-by-applying-thevenins-theorem
<p><span style="color:#000000">Calculate current through 200 ohm resistance by applying thevenin's theorem</span></p><p><span style="color:#000000"><img alt="" src="https://www.sarthaks.com/?qa=blob&qa_blobid=7565059103139758419" style="height:390px; width:600px"></span></p>Electronicshttps://www.sarthaks.com/1028327/calculate-current-through-200-ohm-resistance-by-applying-thevenins-theoremThu, 14 Jan 2021 16:01:06 +0000Find the voltage across the 20 ohm resistance by applying nodal voltage method .
https://www.sarthaks.com/1028326/find-the-voltage-across-the-20-ohm-resistance-by-applying-nodal-voltage-method
<p><span style="color:#000000">Find the voltage across the 20 ohm resistance by applying nodal voltage method .</span></p><p><span style="color:#000000"><img alt="" src="https://www.sarthaks.com/?qa=blob&qa_blobid=11502350212613236764" style="height:397px; width:600px"></span></p>Electronicshttps://www.sarthaks.com/1028326/find-the-voltage-across-the-20-ohm-resistance-by-applying-nodal-voltage-methodThu, 14 Jan 2021 15:59:06 +0000Calculate the current through Load resistance 6ohm resistance by using super position theorem ?
https://www.sarthaks.com/1028325/calculate-current-through-load-resistance-6ohm-resistance-using-super-position-theorem
<p><span style="color:#000000">Calculate the current through Load resistance 6ohm resistance by using super position theorem ?</span></p><p><span style="color:#000000"><img alt="" src="https://www.sarthaks.com/?qa=blob&qa_blobid=8474872542033723877" style="height:353px; width:600px"></span></p>Electronicshttps://www.sarthaks.com/1028325/calculate-current-through-load-resistance-6ohm-resistance-using-super-position-theoremThu, 14 Jan 2021 15:56:18 +0000transmission and distribution electrical math
https://www.sarthaks.com/1026456/transmission-and-distribution-electrical-math
A single core lead covered cable is to be designed for 68 kV(peak value) to earth. Its conductor diameter is 2 cm and its three insulating materials have permittivities of 5, 4 and 3 respectively with the corresponding maximum safe working stress of 38 kV/cm (r.m.s), 26 kV/cm (r.m.s) and 20 kV/cm (r.m.s) respectively. Find the minimum diameter of lead sheath.Electronicshttps://www.sarthaks.com/1026456/transmission-and-distribution-electrical-mathSun, 10 Jan 2021 05:20:04 +0000Electrical math
https://www.sarthaks.com/1026410/electrical-math
A string of 4 insulators has self-capacitance equal to 4 times the pin to earth<br />
capacitance. Calculate the voltage distribution across various units as a<br />
percentage of total voltage across the string and string efficiency.Electronicshttps://www.sarthaks.com/1026410/electrical-mathSat, 09 Jan 2021 17:53:20 +0000Answered: Define permeability in a magnetic circuit
https://www.sarthaks.com/1025198/define-permeability-in-a-magnetic-circuit?show=1025247#a1025247
<p><span style="color:#000000">In electromagnetism, permeability is the measure of magnetization that a material obtains in response to an applied magnetic field. Permeability is typically represented by the (italicized) Greek letter μ. The reciprocal of permeability is magnetic reluctivity.</span></p>Electronicshttps://www.sarthaks.com/1025198/define-permeability-in-a-magnetic-circuit?show=1025247#a1025247Fri, 08 Jan 2021 05:23:35 +0000Mechanics Problem
https://www.sarthaks.com/1025135/mechanics-problem
<pre>
</pre><h1>A roller of weight 10KN rest on a smooth horizontal floor and is connected to the floor by the bar AC as shown in figure . Determine the force in the AC and reaction from floor , if the roller is subjected to a horizontal force of 5KN and inclined force of 7KN as shown in figure.</h1><p><a rel="nofollow" href="denied:javascript:void(0)">See Attachment</a></p>Electronicshttps://www.sarthaks.com/1025135/mechanics-problemFri, 08 Jan 2021 03:09:14 +0000Find the qualent resistance of the circuit
https://www.sarthaks.com/1024758/find-the-qualent-resistance-of-the-circuit
Electronicshttps://www.sarthaks.com/1024758/find-the-qualent-resistance-of-the-circuitThu, 07 Jan 2021 08:40:25 +0000ELECTRICAL AND ELECTRONICS ENGINEERING
https://www.sarthaks.com/1021963/electrical-and-electronics-engineering
a system is designed for a certain application and its performance is to be evaluated using standard singularity functions what will be the frequency domain functions of these singularity functions use Laplace transformationElectronicshttps://www.sarthaks.com/1021963/electrical-and-electronics-engineeringMon, 04 Jan 2021 09:06:47 +0000Find A, B, C and D constants for nominal π and T circuit of a medium transmission line.
https://www.sarthaks.com/1013003/find-a-b-c-and-d-constants-for-nominal-and-t-circuit-of-a-medium-transmission-line
Electronicshttps://www.sarthaks.com/1013003/find-a-b-c-and-d-constants-for-nominal-and-t-circuit-of-a-medium-transmission-lineTue, 22 Dec 2020 10:35:49 +0000Answered: Explain the construction and working principle of a single phase transformer and derive its EMF equations?
https://www.sarthaks.com/1012601/explain-the-construction-working-principle-single-phase-transformer-derive-equations?show=1012608#a1012608
<p><span style="color:#000000">When an alternating voltage V<sub>1</sub> is applied to a primary winding, an alternating current I<sub>1 </sub>flows in it producing an alternating flux in the core. As per Faraday’s laws of electromagnetic induction, an emf e<sub>1</sub> is induced in the primary winding.</span></p><p><img alt="" src="https://www.sarthaks.com/?qa=blob&qa_blobid=12939382025355368921" style="height:137px; width:440px"></p><p><span style="color:#000000"><strong>Working Principle of a transformer</strong></span></p><p><span style="color:#000000">e<sub>1</sub> = <span class="math-tex">\(-N_1\frac{d\varphi}{dt}\)</span></span></p><p><span style="color:#000000">Where N<sub>1 </sub>is the number of turns in the primary winding. The induced emf in the primary winding is nearly equal and opposite to the applied voltage V<sub>1</sub>.<br>Assuming leakage flux to be negligible, almost the flux produced in primary winding links with the secondary winding. Hence, an emf e<sub>2</sub> is induced in the secondary winding.</span></p><p><span style="color:#000000">e<sub>2</sub> = <span class="math-tex">\(-N_2\frac{d\varphi}{dt}\)</span></span></p><p><span style="color:#000000">Where N<sub>2 </sub>is the number of turns in the secondary winding. If the secondary circuit is closed through the load, a current I<sub>2</sub> flows in he secondary winding. Thus energy is transferred from the primary winding to the secondary winding.</span></p><p><span style="color:#000000"><strong>EMF EQUATION.</strong></span></p><p><span style="color:#000000">As the primary winding is excited by a sinusoidal alternating voltage, an alternating current flows in the winding producing a sinusoidally varying flux <span class="math-tex">\(\varphi\)</span> </span><span style="color:#000000">in the core.</span></p><p><span class="math-tex">\(\varphi\,=\,\varphi msin\omega t\)</span></p><p><span style="color:#000000">As per Faraday’s law of electromagnetic induction an emf e<sub>1</sub> is induced in the primary winding.</span></p><p><span style="color:#000000"> e<sub>1</sub> = <span class="math-tex">\(-N_1\frac{d\varphi}{dt}\)</span></span></p><p><span style="color:#000000"> e<sub>1</sub> = <span class="math-tex">\(-N_1\frac{d\varphi}{dt}\)</span>(<span class="math-tex">\(\varphi msin\omega t\)</span>)</span></p><p><img alt="" src="https://www.sarthaks.com/?qa=blob&qa_blobid=11312526310739028047" style="height:96px; width:223px"></p><p><span style="color:#000000">Maximum value of induced emf = <span class="math-tex">\(2\pi f \varphi_mN_1\)</span></span></p><p></p><p><span style="color:#000000">Hence, rms value of induced emf in primary winding is given by,</span></p><p><span style="color:#000000">E<sub>1</sub> = <span class="math-tex">\(\frac{Emax}{\sqrt2}\)</span> = <span class="math-tex">\(\frac{2\pi fN_1 \varphi_m}{\sqrt2}\)</span> = 4.44fN<sub>1</sub><span class="math-tex">\(\varphi_m\)</span></span></p><p><span style="color:#000000">Similarly rms value of induced emf in the secondary winding is given by,</span></p><p><span style="color:#000000">E<sub>2</sub><sub> </sub>= 4.44<span class="math-tex">\(fN_2\varphi_m\)</span></span></p><p><span style="color:#000000">Also,<span class="math-tex">\(\frac{E_1}{N_1}\)</span> = <span class="math-tex">\(\frac{E_2}{N_2}\)</span> = 4.4f<span class="math-tex">\(\varphi_m\)</span></span></p><p><span style="color:#000000">Thus emf per turn is same in primary and secondary winding and an equal emf is induced in each turn of the primary and secondary winding.</span></p>Electronicshttps://www.sarthaks.com/1012601/explain-the-construction-working-principle-single-phase-transformer-derive-equations?show=1012608#a1012608Tue, 22 Dec 2020 06:23:46 +00002, 3, 5, 7, 11, 13, 17, 19 and 23
https://www.sarthaks.com/1006053/2-3-5-7-11-13-17-19-and-23
The line is delivering 72 MW at 0·8 p.f. lagging.<br />
A (medium) single phase transmission line 100 km long has the following constants :<br />
Resistance/km/phase = 0·15 Ω<br />
Inductive reactance/km/phase = 0·377 Ω<br />
Capacitive reactance/km/phase = 31·87<br />
Receiving end line voltage = 132 kV<br />
Assuming that the total capacitance of the line is localised at the receiving end alone, determine :<br />
(i) sending end current (ii) line value of sending end voltage<br />
(iii) regulation (iv) sending end power factorElectronicshttps://www.sarthaks.com/1006053/2-3-5-7-11-13-17-19-and-23Sun, 13 Dec 2020 11:56:58 +0000