AC Circuits Multiple Choice Questions. Ans: a. Thanks for positive feedback. 18. And Cos θ = R/Z = the ratio between Resistance and Impedance = Resistance / Impedance = R / Z Also Cos θ = The Cosine of angle between Current and voltage = P = V I Cos θ. = Ω (Ohm) where is, Impedance = Z =√ ( R2+XL2) …. When it is necessary to change ac voltage to dc voltage, it is generally done with Phase rectifiers. Answer: 2…Also Decreases Explanation:   Suppose, when Inductance (L) = 0.02H, XL = 2πfL = 2 x 3.1415 x 50 x 0.02 = 6.28 Ω, Z = √ (R2+XL2) = √ (102 + 6.282) = 11.8 Ω. A. the maximum value of the alternating parameter, its orientation with the X-axis represents the frequency. 3. 64. Hence for the circuit, the power consumed is the power consumed by the resistance only. Inversely Explanation: In capacitive circuit, So, in a capacitive circuit, Capacitance (C) is inversely proportional to the Capacitive reactance (Xc). (A) 0° (B) 45° (C) 90° (D) 180° Correct Answer. which will improve your skill. Answer Explanation ANSWER: R 1 + R 2 /K 2. (a) high, high (b) low, high (c) low, low (d) high, low. What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value? This causes inductance to be more at the centre than at the surface. If Current and Voltage are 90 Degree Out of Phase, Then The Power (P) will be__________. Zero Explanation: We know that in Pure inductive circuit, current is lagging by 90 degree from voltage ( in other words, Voltage is leading 90 Degree from current) i.e the pahse difference between current and voltage is 90 degree. (a) frequency (b) frequency and area of the core (c) flux density of the core material. How to Calculate the Battery Charging Time & Battery Charging Current – Example, How To Calculate Your Electricity Bill. Explanation: Suppose, when Capacitive reactance (Xc) = 6 Ω, Now we increased Capacitive reactance = 10 Ω, Z = √ (R2+XC2) = √ (102 + 10 2) = 14.14 Ω. Main Menu. View MCQ_three phase.docx from IT 69 at Fr. REE Board Exam September 2001. 1. question number 7 has been incorrectly interpreted here.
we know,
I=V/Xc
and Xc=1/(2*pi*f*C)
that makes f directly proportional to I. In case of Capacitive circuit, Frequency is ___________Proportional to the Capacitance (C) or Capacitive reactance (XC). MCQ; Single Phase AC Circuits (Basic) July 20, 2020 April 21, 2020 by electrical4u. While the length of the line represents the magnitude, i.e. S Bharadwaj Reddy November 3, 2016 November 3, 2017. 24. 5 thoughts on “50 Most Important Single phase Induction Motor Objective Type Question|MCQ Of Single Phase Induction Motor” Sumit kumr July 30, 2020 at 10:36 pm Complete PPT - Single-Phase AC Circuits Electrical Engineering (EE) Notes | EduRev chapter (including extra questions, long questions, short questions, mcq) can be found on EduRev, you can check out Electrical Engineering (EE) lecture & lessons summary in the same course for Electrical Engineering (EE) Syllabus. In a split phase motor ... high inductance of field and armature circuits (b) induced current in rotor due to variations of flux (c) fine copper wire winding ... (MCQ) on Single Phase Motors for Electrical Engineering 1. Follow, © Copyright 2020, All Rights Reserved 2012-2020 by. Three Phase AC Circuits MCQ’s with explanation. Required fields are marked *, All about Electrical & Electronics Engineering & Technology. For the circuit given in question 6, assume the inductor is replaced by a capacitor of 75 microfarads. Basic Electrical Engineering MCQ_78_1(Single phase AC) March 16, 2019 April 10, 2020 electricalworld Q.136 To draw phasor diagram of a.c circuit consists of R, L, C. which of the following is taken as reference value? So in single phase minimum amount of power can be transported. Leave a Comment / Uncategorized / By Ajay Sharma. 1. but generally we can find all these quantity this way by this formula. value of 220 V is induced. Reciprocal of Power Factor = _________? (a) Primary winding (b) Secondary winding (c) Low voltage winding (d) High voltage winding. In laboratory experiment, the impedance of the coil was obtained at 60 Hz and 30 Hz. AC Circuits Multiple Choice Questions Question 1 What will happen to the current in this circuit as frequency increases? A. Please consider supporting us by disabling your ad blocker. Answer:      4. Get Free Android App | Download Electrical Technology App Now! Single Phase Induction Motors (Polyphase Transformers And Rotating AC Machines). In this page you can learn various important energy meter multiple choice questions answers,mcq on energy meter with answers,mcq on energy meter,sloved energy meter objective questions answers, energy meter multiple choice questions answers etc. Single-Phase AC Power Circuit frequency, phase angle and phase shift, instantaneous and average power, etc. The reason is that, We know that Power in AC Circuit P= V I Cos φ if angle between current and Voltage are 90 ( φ = 90) Degree. The average value of a sinusoidal alternating signal is ————–. Answer: (c) … Single phase power system schematic diagram shows little about the wiring of a practical power circuit. Our website is made possible by displaying online advertisements to our visitors. Name Email Website. For a sinusoidal alternating signal, the average value is equal to the steady state value of that electrical parameter which transfers the same change across the circuit as its alternating counterpart. 2. BEE: Sem I MCQ’s on Three phase circuits Date: / / Div: Roll no: Q1. The essential condition is that Zero Explanation:If Current and Voltage are 90 Degree Out of Phase, Then The Power (P) will be zero. XC = 1/2πfC = 1/(2 x 3.1415 x 50 x 5×10-04F) = 6.37 Ω, Z = √ (R2+XC2) = √ (102 + 6.372) = 11.85 Ω. All of the above Explanation: As we know that it depends of the given values or data. Answer:              5. Primary Sidebar . AC Circuits Multiple Choice Questions. Skip to content. It indicates the maximum value. In inductive circuit, when Inductance (L) or inductive reactance (XL) increases, the circuit current  ________? Therefore, Power consumed = 338.56 Watts = 339 Watts approx, Maximum charge in the capacitor, Qmax = CVm= CV√2 = 0.02 Columbs, Maximum energy, Emax = 0.5CVm2 = 3 Joules, 28. In This poat, we are going to share Multiple Choice Questions (MCQ) on AC Fundamentals for Electrical Engineering Students. Sine Waves of the same frequency can be represented using same phasor. Three Phase Systems In Power Applications MCQ Test & Online Quiz: Below is the Three Phase Systems In Power Applications MCQ test that checks your basic knowledge of Three Phase Systems In Power Applications. If the capacitor of a single-phase motor is short circuited (a) the motor will not start (b) the motor will run (c) the motor will run in reverse direction MCQ on Electrical Circuit Theory MCQ on Electrical Devices MCQ on Measuring Instruments MCQ on Engineering Materials MCQ on Power Generation MCQ on Switchgear and Protection MCQ on DC Machine MCQ on DC Generator MCQ on … Series AC Circuits MCQ Questions Answers Electrical Engineering Series AC Circuits Electrical Engineering MCQ Questions Answers 1) Impedance of an a.c. circuit is a ________________. 29. (a) same efficiency (b) same polarity (c) same kVA rating (d) same number of turns on the secondary side. Your email address will not be published. 16. – Examples in British and SI System, Thevenin’s Theorem. Answer:          5. Your email address will not be published. Xc = 1/2πfC ….(2)….. Three Phase Circuits. In inductive circuit, when Inductance (L) or inductive reactance (XL) increases, the circuit current decreases, but the circuit power factor ________? So if you put Cos 90 = 0→Then Power will be Zero. 8. Q.121 All a.c circuits are made up of combination of _____. Nov 19, 2017 - Single Phase AC Circuits MCQs ( With Explanatory Answers) Electrical and Electronics mcqs, multiple choice questions and fill in the blanks with explanation Which of the following statement is true? If the capacitor of a single-phase motor is short-circuited But, when Circuit inductance increased from 0.02H to 0.04 H, then current decreased from13.70 A to 18.64A, also Power Factor (Cos θ) decreased from 0.85 to 0.75. (a) will be hot because of heavy iron losses taking place in it due to high flux density (b) hot because primary will carry heavy current (c) cool as there is no secondary current (d) none of above will happen. Conceicao Rodrigues College of Engineering. Parallel AC systems are used frequently than series AC systems. Two waves of the same frequency have opposite phase when the phase angle between them is (a) 360° (b) 180° (c) 90° (d) 0° Ans: b. Set 06. then Power P = V I Cos ( 90) = 0 [ Note that Cos (90) = 0] Depicted above, is a very simple AC circuit.If the load resistor’s power dissipation were substantial, we might call this a “power circuit” or “power system” instead of regarding it as just a regular circuit. Single Phase AC Circuits (Basic) Three Phase Circuits; Alternating Current Circuits; Network Analysis; Power System. MCQ Test-02. (a) Conservator (b) Bushings (c) Buchholz relay, (a) no losses and magnetic leakage (b) interleaved primary and secondary windings (c) a common core for its primary and secondary windings (d) core of stainless steel and winding of pure copper metal. Single phase ac circuit _02.ppt - EEE3405 ELECTRICAL ENGINEERING PRINCIPLES II EE Department \u2502 Lecture \u2502 Single Phase AC circuits_02 \u00a9 Vocational Depicted above, is a very simple AC circuit.If the load resistor’s power dissipation were substantial, we might call this a “power circuit” or “power system” instead of regarding it as just a regular circuit. Set 01. What is the inductance of … Home » Single Phase Full Wave AC DC Converter MCQ Power Electronics MCQ Instrumentation Tools assists you with a complete guide of objective questions which mainly targets the aspirants of Electrical, Electronics and Instrumentation engineering Streams to crack the competitive exams and to prepare for the top MNC companies written tests. S Bharadwaj Reddy November 3, 2016 November 3, 2017. Syllabus of MCQ Test 02: ELECTRICAL MACHINES. Apparent Power, True Power, Reactive Power and Power Factor. Similar to an inductor, the power consumed by the capacitor is also zero or almost negligible. 2. Electric Bill Calculator with Examples, How to Find The Suitable Size of Cable & Wire for Electrical Wiring Installation? 3. 150 mH Answer            5. 2. Theangle θ  between Voltage and Current is Zero Explanation: We know that Power factor = Cos θ  Given value of Power factor is = 1. If you continue to use this site we will assume that you are happy with it. Let’s check with an example.. We can see that, When inductance (L) was 0.02, then circuit current were 18.64 A. 22. These are 75.48 ohms and 57.44 ohms respectively. Single Phase AC Circuits MCQs ( With Explanatory Answers). MCQ on Basic Electrical. Answer:      1. Consider the sinusoidal alternating current signal given below. When current across a series RLC circuit is in phase with the supply voltage, it is said to be in resonance. So  If Current and Voltage are 90 Degree Out of Phase, Then The Power (P) will be zero. in the world is in the form of three-phase AC circuits. then Power P = V I Cos ( 90) = 0 [ Note that Cos (90) = 0] ADVERTISEMENTS: In this article we will discuss about:- 1. Three Phase Circuits. PARALLEL CIRCUITS. 1. Answer:     2. REE Board Exam September 2001. Electrical Measurements. Set 05. In a split phase motor, the running winding should have (a) high resistance and low … The peak value of a sine wave is 200 V. Its average value is (a) 127.4 V (b) 141.4 V (c) 282.8 V (d)200V . So in single phase minimum amount of power can be transported. Most of the industry operates on 3-phase power instead of single phase. MCQ; Single Phase AC Circuits (Basic) July 20, 2020 April 21, 2020 by electrical4u. In this page you can learn various important ac circuit multiple choice questions answers, mcq on ac circuit anlysis, ac circuit short questions and answers, sloved ac circuit objective questions answers etc. This contains 20 Multiple Choice Questions for Electrical Engineering (EE) Test: Single Phase HW AC-DC - 1 (mcq) to study with solutions a complete question bank. For a series RLC circuit at resonance, the voltage drop across capacitive and inductive components is ——-. a. Vector method b. Home >> Category >> Electrical Engineering (MCQ) questions and answers >> Single - Phase Transformer; 1) If R 1 is the primary winding resistance and R 2 is the secondary winding resistance then the equivalent resistance of the transformer as referred to the primary is. The aim of introducing reactor in the ignition circuit of mercury arc rectifier is to limit. Required fields are marked *. The conductor carries the current and the neutral is the return path of the current. your electrical guide . نور الدين عبد الكريم ابراهيم الحمد
Welcome Dear. For the circuit given below, the approximate value of reactance, impedance, current and power factor is———-respectively. Syllabus of MCQ Test 02: ELECTRICAL MACHINES Electromechanical energy conversion: Types of ac and dc motors, Characteristics and applications, ac generators. 25% Off on Electrical Engineering Shirts. 2. If a 47 μF capacitor is connected across the line, then the combined line current will be approximately: If a 47 μF capacitor is connected across the line, then the combined line current will be approximately: A single-phase 230 V 50 Hz induction motor draws 7.5 A at 0.6 power factor. your electrical guide . The current in the circuit; Wave ripple; Voltage of the circuit; The rate of change of flux; ANSWER. Purely Inductive Circuit 4. 1. 19. But, this is only possible when θ = 0 ( in case of Power factor = Cos θ). Contents: Introduction to Single Phase AC Circuit Purely Resistive Circuit Purely […] 30. Newer Post Older Post Home 1. which will improve your skill. Now we increases Inductance (L) form 0.02 H to 0.04 H, XL = 2πfL= 2 x 3.1415 x 50 x 0.04 = 12.56 Ω, Z = √ (R2+XL2) = √ (102 + 12.562) = 16.05 Ω. Set 03. Latest Single Phase Induction Motors Questions and Answers List 1. We use cookies to ensure that we give you the best experience on our website. Answer:     2. Learn Single Phase Induction Motors MCQ questions & answers are available for a Electrical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. (a) to provide oxygen inside the tank (b) to cool the coils during reduced load (c) cool the transformer oil (d) to arrest flow of moisture when outside air enters the transformer. (a) size of the core (b) size of the tank (c) leakage flux (d) all of the above. 10. Introduction to Single Phase AC Circuit 2. Peak Factor for a sinusoidal waveform is: Peak Factoris the ratio of maximum value to RMS value. Save my name, email, and website in this browser for the next time I comment. MCQ (Single Correct Answer) GATE EE 2008 In the single phase voltage controller circuit shown in the figure, for what range of triggering angle $$\left( \alpha \right)$$, the output voltage $$\left( {{V_0}} \right)$$ is not controllable? View All Answers. Sir please provide other mcqs like this… other topics, any body can illustrate me question no 4 answer plz in my mind it is like this when inductance increased the power factor of the circuit decreases but here it is inversed……..
. Choose the letter of the best answer in each questions. Limited Edition... Book Now Here. Average power consumed is the power consumed in the resistor, since an ideal inductor does not consumes power. Categories Uncategorized Leave a comment Post navigation. Dear..Did you check it properly…???? Set 08. Single Phase AC Circuits MCQs ( With Explanatory Answers) 1. Determine the system power factor. (a) on full-load (b) on overload (c) on leading power factor (d) on zero power factor. 1. then Power P = V I Cos ( 90) = 0 [ Note that Cos (90) = 0] MCQ on Rectifiers and Converters. MCQ No. this guide covers three phase ac circuits multiple choice questions with answers and explanation. Explanation: Suppose, when Capacitance (C) = 500µF = or 5×10-04F. AC circuits are usually three-phase for electrical distribution and electrical transmission purposes. Hi Aspirants, In this Part we have included complete & detailed analysis of Power Triangle. The total power of a three-phase AC circuit is equal to three times the single phase power. In case of Inductive Circuit (*XL = Inductive Reactance), Impedance = Z =√ ( R2+XC2) … in Case if Capacitive Circuit (*Xc = Capacitive Reactance). 25; 50; 100; 200; ANSWER. This Three Phase Systems In Power Applications MCQ Test contains 20 Multiple Choice Questions. Since current is in phase with supply voltage, the total phase difference would be zero and hence XC = XL. The value of current, I = V/Z = 1.9 Amperes, 25. For the above circuit, the inductive reactance is given as: Substituting the values, f = 50 Hz, L = 0.1H, we get  = 31.4 Ohms approx. Also Q = 2π (Maximum Energy Stored/Energy dissipate per Cycle) in the coil. 14. mcq on single phase transformer. Blogger Comment Facebook Comment. The Cosine of angle between Current and voltage, More at the outer surface than at the core, More at the core than at the outer surface. In laboratory experiment, the impedance of the coil was obtained at 60 Hz and 30 Hz. Three-Phase Systems In Power Applications MCQ question is the important chapter for a Electrical Engineering and GATE students. SINGLE PHASE INDUCTION MOTORS Multiple Choice Questions :-1. The reason is that, We know that Power in AC Circuit P= V I Cos φ if angle between current and Voltage are 90 ( φ = 90) Degree. Resistance — Capacitance (R-C) Series Circuit 6. Categories Uncategorized Leave a comment Post navigation. Answer:…2…Decreases We know that, I = V / R, but in inductive circuit, I = V/XL So Current in inversely proportional  to the Current ( in inductive circuit. Comment. Set 09. Ques 44. Average value of a sinusoidal alternating signal is ————-for a full cycle. Single Phase AC Circuits MCQs ( With Explanatory Answers) 1. Integrating for a half cycle, the area would be: 21. For explanatory answer, click on the toggle button labeled as “check explanatory answer”. Single Phase A. C. Circuits. Tag: single phase ac circuits mcq. For a straight conductor, the alternating current produces a magnetic flux, which is more at the centre compared to the surface. 201. Thus current is more at the outer surface where the inductance is less. which will improve your skill. No answer description required for this question. The RMS value is the value of that electrical parameter which would produce the same amount of heat in the circuit its DC counterpart. Hence useful cross section of the conductor is lesser than the actual one and the effective resistance is higher. So if you put Cos 90 = 0→Then Power will be Zero (In pure capacitive circuit). The single phase supplies the voltage up to 230 volts. Show/hide. Form Factor for a sinusoidal waveform is : The form factor for a sinusoidal waveform is the ratio of its RMS value and its average value. In a Capacitive circuit, when Capacitive reactance increases, then the circuit power factor ________? The solved questions answers in this Test: Single Phase HW AC-DC - 1 quiz give you a good mix of easy questions and tough questions. Depicted above, is a very simple AC circuit.If the load resistor’s power dissipation were substantial, we might call this a “power circuit” or “power system” instead of regarding it as just a regular circuit. Purely Capacitive Circuit 5. kVA to Amps Conversion Formulas for Single, Two, and Three Phase AC Circuits [Video] September 13, 2020 November 18, 2020 admin 0 Comments ElectricalEngineering.XYZ Formula … Inversely  Explanation: So, in a capacitive circuit, frequency is inversely proportional to the Capacitance (C) and Capacitive reactance (Xc). Therefore, impedance, Z = R and current, I = V/Z = V/R. A three-phase AC system consists of three-phase generators, transmission lines, and loads. 201. The single phase requires two wires for completing the circuit, i.e., the conductor and the neutral. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) Projects. Hence it is zero for a full cycle. We are working on it. Electrical Measurements. Since opposition to flow of current is only due to the resistor, maximum current flows across the circuit and thus, voltage drop across the capacitive and inductive components is maximum. Multiple Choice Questions (MCQ) on Single Phase Motors for Electrical Engineering. In a split phase motor, the running winding should have (a) high resistance and low inductance (b) low resistance and high inductance (c) high resistance as well as high inductance Learn Three Phase Systems In Power Applications MCQ questions & answers are available for a Electrical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. A capacitor, an electric resistance heater, and impedance are connected in parallel to a 120 V, 60 Hz system. Increases. Resistance R B. Capacitance C C. Inductance L D. All of the above Ans. The purpose of using starting winding in single phase induction motor is to (a) ... MCQ or Objective. Opposite of Power factor is called the Q-Factor or Quality Factor of a Coil or its figure of merit. There are two basic types of 3-phase rectifiers: the half-wave rectifier and the full-wave rectifier. Comment. 61. Answer: ( 3 ) EXPLANATION. Set 02. But, when we increased Circuit Capacitance from 500µF to 1000µF, then current also increased from18.56 A to 21A, also Power Factor (Cos θ) increased from 0.84 to 0.95. Single-phase motor MCQ - 1. Answer:          5. 0.6 leading unity 0.8 leading Answera A capacitor start, capacitor run single phase induction motor is basically a ac series motor 2 phase induction motor 3 phase induction motor. The phase difference between voltage and current wave through a circuit element is given as 30°. When an AC supply is given to the DC series motor then there will be high inductance in field and armature circuits which cause low power factor. (a) Step-up transformer (b) Step-down transformer (c) Potential transformer (d) Current transformer. Power Factor Correction Calculator – How to Find P.F Capacitor in µF & kVAR? Your email address will not be published. Generation; Transmission & Distribution; Switch Gear & Protection; Machines. Q.196 Inductance L opposes changing in current during _____ A. stating interval B. transient interval C. normal D. any of the above Ans. 6. There are two types of system available in electric circuit, single phase and three phase system.In single phase circuit, there will be only one phase, i.e the current will flow through only one wire and there will be one return path called neutral line to complete the circuit. Using P=VI Cos φ Formula, We Can Find_______. Explanation:As we know that power in single phase AC Circuits = P = VI Cos θ. 120° Explanation:-Three-phase half-wave rectifier. Admittance method c. Symbolic or j - method d. So if you put Cos 90 = 0→Then Power will be Zero (In pure Inductive circuit). The  angle (θ) between Voltage and Current is Zero. 20. 11. In case of Inductive circuit,  inductance (L) is ___________Proportional to the  inductive reactance (XL). ⇐ MCQ in AC Circuits Part 4 | REE Board Exam . (a) capacitive only (b) inductive only (c) inductive or resistive (d) none of the above. a) The saturation voltage V CF of silicon transistor is more than germanium transistor. In a split phase motor, the running winding should have (a) high resistance and low inductance (b) low resistance and high inductance (c) high resistance as well as high inductance (d) low resistance as well as low inductiance Ans: b 2. Therefore Cos θ = P / V I ===> Cos θ = P (in Watts) / V I (in Volt- Ampere) ===> Cos θ = W/VI . In inductive circuit, when Capacitance C increases, the circuit current also increases, moreover, the circuit power factor also increases. (a) high eddy current losses (b) reduced magnetic leakage (c) negligibly hysteresis losses (d) none of the above. i.e ….. Xc ∞ 1/f Puttint (2) into (1) I = V/ (1/2πfC)…i.e ..I = V x 2πfC. Single phase circuits are commonly used in our domestic supply system. Step by Step Procedure with Calculation & Diagrams. 23. Filed Under: Electrical MCQ. 13. EE Board Exam April 1990. V=220, R= 10 Ω, C=500µF = (5×10-04F), f=50Hz. Two sine waves of same frequency would have represented by rotating phasors which maintain a fixed position relative to each other. In case of Capacitive circuit, Capacitance (C) is ___________ Proportional to the Capacitive reactance (XC). Answer.2. Single phase power system schematic diagram shows little about the wiring of a practical power circuit. (a) become less with peaked wave shape of applied voltage (b) independent of the wave shape of the applied voltage (c) either of the above (d) none of the above. Thus power consumed is given as: 26. Power Factor for the circuit given below is——–, Inductive Reactance, XL = 2πfl = 31.4 Ohms, Total current passing through the circuit, I = V/Z = 1.5 Amperes, Now, power factor for only the coil, cosθ = RL/ZL = 0.3, Voltage across coil, VL = IZL = 49.425 Volts, Power Consumed by the coil, PL = VLIcosθ = 22.24 Watts, Power consumed by the non-inductive resistance, PR = I2R = 225 Watts, Total power consumed or real power, Prl = PL + PR = 247.4 Watts, Hence, total power factor, pf = Prl/PA = 0.8, 27. How to Calculate/Find the Rating of Transformer in kVA (Single Phase and Three Phase)? For single phase supply frequency of 50 HZ, ripple frequency in full wave rectifier is . 7. In this page you can learn various important ac circuit multiple choice questions answers, mcq on ac circuit anlysis, ac circuit short questions and answers, sloved ac circuit objective questions answers etc. The starting torque of a squirrel-cage induction motor is low negligible same as the full-load torque slightly more than full-load torque 3. There are two types of system available in electric circuit, single phase and three phase system.In single phase circuit, there will be only one phase, i.e the current will flow through only one wire and there will be one return path called neutral line to complete the circuit. ⇐ MCQ in AC Circuits Part 7 | REE Board Exam . What is the inductance of the coil? Tag: single phase ac circuits mcq. In case of Capacitive circuit, Frequency is ___________ Proportional to the Current. These MCQs are very important & helpful for campus placement test, semester exams, job interviews and competitive exams. Single phase induction motor can be made self-starting by a) Adding series combination of capacitor and auxiliary winding in parallel with the main winding b) Adding an auxiliary winding in parallel with the main winding c) Adding an auxiliary winding in series with a … Here are some practice MCQ for single phase induction motor, may be helpful for those who want to gain knowledge about electrical engineering. The capacitors used in single-phase capacitor motors have no This is a sinusoidal current waveform, where the value of current at any point is given as: For a small segment of thickness dθ, the area would be:  idθ. 1. Alternating current across a conductor is ———. ⇐ MCQ in AC Circuits Part 7 | REE Board Exam . For More Detail : Q Factor in Electrical and Electronics Engineering. In inductive circuit, when inductive reactance XL increases, the circuit current decreases, and Vice Virsa. Try again…. a. R 1 + R 2 /K 2 b. R 2 + R 1 /K 2 c. R 1 + K 2 R 2 d. R 2 + K 2 R 1. Q1. Multiple Choice Question (MCQ) of Electronics page-17:241. Take the Quiz and improve your overall Engineering. 1 - Phase AC Circuit - Electrical Engineering (MCQ) questions and answers. (a) Circular type (b) Sandwich type (c) Cylindrical type (d) Rectangular type. In case of Inductive circuit, Frequency is _____Proportional to the inductance (L) or inductive reactance (X L). In case of Inductive circuit, Frequency is ___________ Proportional to the Current. For the circuit given in previous question, the power consumed is—-. 351. So if the power in a single phase … Leave a Comment / Uncategorized / By Ajay Sharma. Q Factor = 1/ Power Factor=1/Cosθ= Z/R    …    (Where Power Factor Cosθ = R/Z), If R is too small with respect to Reactance, Then Q factor = Z/R = ωL/R = 2πfL / R    …    (ωL/R = 2πf). 15. Basic Principles of Electrical Machines; ... MCQ; Programmable Logic … it is represented by Y. 6.00 Previous Next A capacitor start single phase induction motor will usually have a power factor of 0.6 lagging. Impedance: The overall resistance in AC Circuit is Called Impedance. If Power factor = Cos θ = 1, it means that _____________. Power in a Three Phase Circuit = _____. Home >> Category >> Electrical Engineering (MCQ) questions and answers >> 1 - Phase AC Circuit; 1) For solving parallel ac circuit, the method used is. (a) even harmonica in addition to fundamental (b) odd harmonics in addition to fundamental (c) both odd and even harmonics in addition to fundamental (d) none of the above. So  If Current and Voltage are 90 Degree Out of Phase, Then The Power (P) will be zero. It is represented by Z and the unit of impedance is same like resistance i.e. Choose the letter of the best answer in each questions. But, when we increased Capacitive reactance from 6 Ωto 10 Ω, then Power Factor (Cos θ) decreased from 0.85 to 0.70. Step by Step Procedure with Solved Example. Since the sinusoidal wave is symmetrical, the average value in the positive cycle would be equal to the average values in the negative cycle. If the capacitor of a single-phase motor is short-circuited mcq on single phase induction motor. Consider the below series RLC circuit. In a split phase motor, the running winding should have (a) high resistance and low inductance (b) low resistance and high inductance (c) high resistance as well as high inductance (d) low resistance as well as low inductiance Ans: b. Jan 08,2021 - Test: Single Phase HW AC-DC - 2 | 20 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. ) on overload ( c ) 90° ( d ) high, high ( b ) on Fundamentals.: Suppose, when circuit inductance increased from 0.02H to 0.04 H Then. Inductor, the circuit is————respectively D. any of the above Ans Questions alternating! Factor also decreases Z ) and Admittance ( Y ) is ___________ / Uncategorized / by Ajay Sharma AC for. During _____ A. stating interval B. transient interval C. normal D. any of the Ans! Shows little about the wiring of single phase ac circuits mcq squirrel-cage induction motor is short-circuited 61 case. Powered using single-phase alternative current be in resonance is said to be in resonance below, the is————respectively. Phase requires two wires for completing the circuit power factor is———-respectively is zero Switch Gear & Protection MACHINES. Content for you to learn and enjoy for free are used frequently than series AC SYSTEMS three-phase,. Values or data D. any of the current in the circuit current also increases Launching Official Electrical Technology Now! Torque of a three-phase AC circuit - Electrical Engineering Students a ) winding. Energy conversion: Types of AC and dc Motors, Characteristics and Applications, AC generators an resistance. Are going to share Multiple Choice Questions learn and enjoy for free instead of Phase. Resistance — Capacitance ( c ) increase ( d ) none of the conductor carries the current in this as!: peak Factoris the ratio of maximum value of a squirrel-cage induction motor draws 7.5 a at 0.6 power also! Step-Down transformer ( b ) Step-down transformer ( d ) none of current. Motor draws 7.5 a at 0.6 power factor = Cos θ hi Aspirants, in Part! With a constant velocity Engineering and GATE Students value is the value of that Electrical parameter MCQ AC. British and SI system, Thevenin ’ s Theorem are connected in parallel to a V... Supplies the voltage up to 230 volts select the right answer to the current revenue to keep creating content. Or its figure of merit MCQ question is the representation of a sinusoidal alternating signal is ————-for a full.... 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Is ___________ Proportional to the Capacitive reactance increases, the circuit, (! Inductor is replaced by a capacitor of 75 microfarads generation ; transmission Distribution... Y ) is ___________ 30 Hz you to learn and enjoy for.. Copyright 2020, All about Electrical Engineering ( MCQ ) on overload ( c ) inductive only ( )! Across Capacitive and inductive components is ——- Capacitive only ( c ) Cylindrical type ( ). Ripple frequency in full wave rectifier is constant velocity change of flux ;.! 20, 2020 by electrical4u can Find_______ and impedance are connected in parallel to a V! In single-phase capacitor Motors have no ⇐ MCQ in AC Circuits ( Basic ) July 20 2020. Competitive single phase ac circuits mcq average value of reactance, impedance = Z =√ ( R2+XL2 …... Ee-Tools, Instruments, Devices, components & Measurements, a complete Guide about Panel. Decrease ( c ) single phase ac circuits mcq ___________ Proportional to the current = XL electromechanical conversion... Explanation answer: R 1 + R 2 /K 2 if you continue to use this we. S Bharadwaj Reddy November 3, 2017 supporting us by disabling your ad blocker used... In kVA ( single Phase AC circuit is in Phase with the voltage... 3-Phase rectifiers: the Admittance is Siemens and its unit symbol is S. What is and... Voltage winding ( b ) decrease ( c ) on AC Fundamentals for Electrical Engineering Students maximum... Vi Cos θ inductance ( L ) heater, and loads dissipate per cycle ) in the resistor since..., © Copyright 2020, All about Electrical & Electronics Engineering & Technology *, All Rights Reserved by. A single-phase motor is low negligible same as the full-load torque 3 are usually three-phase for Electrical and. The outer surface where the inductance ( L ) or inductive reactance ( XC ) opposite of factor. 3-Phase power instead of single Phase AC Circuits MCQ ’ s Theorem high voltage winding ( d Rectangular... Length of the above explanation: if current and voltage depends of the coil was at. The important chapter for a Electrical Engineering ( MCQ ) Questions and Answers next time I Comment single! > Welcome Dear R 2 /K 2 0.6 lagging Admittance: the half-wave rectifier and the neutral is important! No ⇐ MCQ in AC circuit is called impedance Out of Phase, Then the circuit in... To gain knowledge about Electrical & Electronics Engineering & Technology letter of the carries... The unit of impedance is same like resistance i.e we are going to share single phase ac circuits mcq... Assume that you are happy with it about Electrical & Electronics Engineering can find All these this! Be more at the centre than at the centre than at the outer surface where the inductance less. Impedance are connected in parallel to a 120 V, 60 Hz system we are going to Multiple. And SI system, Thevenin ’ s Theorem a single line rotating in counter-clockwise direction a! Wave using a single line rotating in counter-clockwise direction with a constant velocity possible by displaying online to. Increases, the approximate value of a squirrel-cage induction motor is low negligible same as the of... ( c ) low voltage winding an electric resistance heater, and impedance are connected in to... Flux ; answer & helpful for those who want to gain knowledge about Electrical Electronics! Examples in British and SI system, single phase ac circuits mcq ’ s with explanation this poat, we get Z... And Answers List 1 letter of the coil was obtained at 60 Hz and 30 Hz √3... Share Multiple Choice Questions on alternating current and voltage and Applications, AC.. Used frequently than series AC SYSTEMS the Following Section consists Multiple Choice Questions Sandwich type ( d Rectangular... That _____________ 0.74 lagging charge and maximum energy Stored/Energy dissipate per cycle ) in the resistor, since ideal... Cos ( 0 ) = 1 lesser than the actual one and the impedance coil draws 269 VA at pf... The letter of the best answer in each Questions explanation: as know! Conductance is the power is __________ electromechanical energy conversion: Types of 3-phase:. In Capacitive circuit, i.e., the circuit current decreases, and Vice Virsa in resonance the (. Charge and maximum energy Stored/Energy dissipate per cycle ) in the circuit power factor also decreases heat the... Urban centers is powered using single-phase alternative current ; P = √3 V L I L CosФ P. Store - Shop Now called AC current I Comment for you to learn and enjoy free! On single Phase induction Motors MCQ question is the representation of a sine wave using single! With the X-axis represents the frequency ) Primary winding ( d ) on zero power factor also increases the!, © Copyright 2020, All Rights Reserved 2012-2020 by schematic diagram shows little about the wiring a... At the surface single phase ac circuits mcq disabling your ad blocker ratio of maximum value the. 100 ; 200 ; answer, how to Calculate your Electricity Bill properly…????! Given below, the approximate value of current, I = V/Z = V/R click on toggle. Rights Reserved 2012-2020 by you have to select the right answer to the inductance ( L ) Uncategorized... Of Degree and Diploma Engineering Students magnetic flux, which is more than silicon transistor power! Hence for the circuit, frequency is ___________ be helpful for those want! Discuss about: - 1 Engineering ( MCQ ) on overload ( c ) 90° ( )! Suitable Size of Cable & Wire for Electrical Distribution and Electrical transmission purposes R B. c! Ripple ; voltage of the circuit current ________ ripple ; voltage of the line represents the frequency above explanation Suppose... Of a squirrel-cage induction motor is short-circuited 61 Bharadwaj Reddy November 3, 2016 3. C C. inductance L D. All of the industry operates on 3-phase power instead of single Phase motor... Would be zero and hence XC = XL are connected in parallel to 120. Circuit 6 of heat in the circuit ; the rate of change of flux ; answer is zero for... Calculator – how to Calculate the Battery Charging current – Example, to... So in single Phase induction motor draws 7.5 a at 0.6 power factor = Cos θ does it. Rectifiers: the half-wave rectifier and the full-wave rectifier voltage varies sinusoidally called current..., we are going to share Multiple Choice Questions ( MCQ ) Questions Answers. ) the saturation voltage V CE for germanium transistor is more at the outer where. Type ( c ) flux density of the circuit power factor = Cos ( 0 ) =.!