Welcome Dear. Get Free Android App | Download Electrical Technology App Now! Set 03. Xc = 1/2πfC ….(2)….. In case of Capacitive circuit, Frequency is ___________ Proportional to the Current. (a) high, high (b) low, high (c) low, low (d) high, low. Since current is in phase with supply voltage, the total phase difference would be zero and hence XC = XL. 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). Therefore, impedance, Z = R and current, I = V/Z = V/R. but generally we can find all these quantity this way by this formula. A capacitor, an electric resistance heater, and impedance are connected in parallel to a 120 V, 60 Hz system. Definition of Single phase. It is represented by Z and the unit of impedance is same like resistance i.e. Resistance R B. Capacitance C C. Inductance L D. All of the above Ans. 1. (a) capacitive only (b) inductive only (c) inductive or resistive (d) none of the above. Integrating for a half cycle, the area would be: 21. Thus series resonance is avoided in power systems. For single phase supply frequency of 50 HZ, ripple frequency in full wave rectifier is . it is represented by Y. Skip to content. 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. (a) high eddy current losses (b) reduced magnetic leakage (c) negligibly hysteresis losses (d) none of the above. 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. Answer: (3)…Both 1 & 2. Zero Explanation:If Current and Voltage are 90 Degree Out of Phase, Then The Power (P) will be zero. Impedance: The overall resistance in AC Circuit is Called Impedance. It is determined by averaging all the instant values of the electrical parameter. 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. Projects. This causes inductance to be more at the centre than at the surface. MCQ Test-02. The purpose of using starting winding in single phase induction motor is to (a) ... MCQ or Objective. Therefore Cos θ = P / V I ===> Cos θ = P (in Watts) / V I (in Volt- Ampere) ===> Cos θ = W/VI . Multiple Choice Questions (MCQ) on Single Phase Motors for Electrical Engineering. 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. Hence for the circuit, the power consumed is the power consumed by the resistance only. So If Current and Voltage are 90 Degree Out of Phase, Then The Power (P) will be zero. Answer: 1. (a) low insulation (b) easy access (c) lower terminal voltage and higher current rating (d) more number of turns, (a) not be open-circuited (b) not be short-circuited (c) either of the above (d) none of the above, (a) lubricate the core (b) insulate the core (c) insulate the coils (d) none of the above, (a) reduces dissipation of heat (b) may short-circuit the windings (c) absorbs oil and grease (d) tends to corrode the metal surface, (a) primary and secondary windings are capacitively coupled (b) primary and secondary windings are inductively coupled (c) primary and secondary windings are conductively coupled (d) none of the above, (a) where ratio of transformation is low (b) where it is required to isolate the two windings electrically (c) because it is much safer to use en auto-transformer (d) where large number of secondary taps are needed, (a) low (b) high (c) zero (d) none of the above, (a) low (b) high (c) either of the above (d) none of the above. (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. Skip to content. 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 6.00 Previous Next 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. Electrical Measurements. Determine the system power factor. www.gtu-mcq.com is an online portal for the preparation of the MCQ test of Degree and Diploma Engineering Students of the Gujarat Technological University Exam. AC Circuits Multiple Choice Questions. 15. 19. Set 04. Average power consumed is the power consumed in the resistor, since an ideal inductor does not consumes power. 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 . 1 - Phase AC Circuit - Electrical Engineering (MCQ) questions and answers. Purely Capacitive Circuit 5. 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. Similar to an inductor, the power consumed by the capacitor is also zero or almost negligible. Hi Aspirants, In this Part we have included complete & detailed analysis of Power Triangle. 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. (a) low power factor wattmeter (b) unity power factor wattmeter (c) frequency meter (d) any type of wattmeter. A. The angle (θ) between Voltage and Current is Zero. The single phase requires two wires for completing the circuit, i.e., the conductor and the neutral. We can see that, When inductance (L) was 0.02, then circuit current were 18.64 A, and Circuit power factor was (Cos θ) = 0.85. Answer Explanation ANSWER: R 1 + R 2 /K 2. 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) same efficiency (b) same polarity (c) same kVA rating (d) same number of turns on the secondary side. Sine Waves of the same frequency can be represented using same phasor. Answer: 5. PARALLEL CIRCUITS. In inductive circuit, when Inductance (L) or inductive reactance (XL) increases, the circuit current ________? which will improve your skill. Increases. SERIES CIRCUITS. mcq on single phase transformer. Phasor Diagram is the representation of a sine wave using a single line rotating in counter-clockwise direction with a constant velocity. 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. Name Email Website. I.e, Cosθ = Cos (0) = 1. Answer: 5. Step by Step Procedure with Solved Example. (a) Primary winding (b) Secondary winding (c) Low voltage winding (d) High voltage winding. Filed Under: Electrical MCQ. In case of Inductive circuit, inductance (L) is ___________Proportional to the inductive reactance (XL). If Power factor = Cos θ = 1, it means that _____________. In inductive circuit, when inductive reactance XL increases, the circuit current decreases, but the circuit power factor also Decreases. Set 08. Limited Edition... Book Now Here. When current across a series RLC circuit is in phase with the supply voltage, it is said to be in resonance. Electromechanical energy conversion: Types of ac and dc motors, Characteristics and applications, ac generators. 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. Most lighting in urban centers is powered using single-phase alternative current. ⇐ MCQ in AC Circuits Part 7 | REE Board Exam . Consider the below series RLC circuit. 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. But, this is only possible when θ = 0 ( in case of Power factor = Cos θ). 8. SINGLE PHASE INDUCTION MOTORS Multiple Choice Questions :-1. Ans: a. 1. In a split phase motor, the running winding should have (a) high resistance and low … In inductive circuit, when Inductance (L) or inductive reactance (XL) increases, the circuit current decreases, but the circuit power factor ________? mcq on single phase induction motor. Generation; Transmission & Distribution; Switch Gear & Protection; Machines. Thanks for positive feedback. (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. P = 3 V Ph I Ph CosФ; P = √3 V L I L CosФ; Both 1 & 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: The conductor carries the current and the neutral is the return path of the current. For the circuit given below, the approximate value of reactance, impedance, current and power factor is———-respectively. REE Board Exam September 2001. Conceicao Rodrigues College of Engineering. The aim of introducing reactor in the ignition circuit of mercury arc rectifier is to limit. 3. When it is necessary to change ac voltage to dc voltage, it is generally done with Phase rectifiers. Thus power consumed is given as: 26. 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. Introduction to Single Phase AC Circuit 2. 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 Two sine waves of same frequency would have represented by rotating phasors which maintain a fixed position relative to each other. Single phase ac circuit _02.ppt - EEE3405 ELECTRICAL ENGINEERING PRINCIPLES II EE Department \u2502 Lecture \u2502 Single Phase AC circuits_02 \u00a9 Vocational In laboratory experiment, the impedance of the coil was obtained at 60 Hz and 30 Hz. Jan 08,2021 - Test: Single Phase HW AC-DC - 2 | 20 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. Set 02. In case of Inductive Circuit (*XL = Inductive Reactance), Impedance = Z =√ ( R2+XC2) … in Case if Capacitive Circuit (*Xc = Capacitive Reactance). Multiple Choice Question (MCQ) of Electronics page-17:241. (a) on full-load (b) on overload (c) on leading power factor (d) on zero power factor. Your email address will not be published. These are 75.48 ohms and 57.44 ohms respectively. Set 10. V=220, R= 10 Ω, C=500µF = (5×10-04F), f=50Hz. Our website is made possible by displaying online advertisements to our visitors. Comment. Latest Single Phase Induction Motors Questions and Answers List 1. The average value of a sinusoidal alternating signal is ————–. Answer: (c) … 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? Now we increased Capacitance (C) = 1000µF = or 1×10-3F, XC = 1/2πfC = 1/(2 x 3.1415 x 50 x 1×10-3F) = 3.18 Ω, Z = √ (R2+XC2) = √ (102 + 3.18 2) = 10.49 Ω. Single phase power system schematic diagram shows little about the wiring of a practical power circuit. But, when Circuit inductance increased from 0.02H to 0.04 H, then current decreased from13.70 A to 18.64A. Leave a Comment / Uncategorized / By Ajay Sharma. A single-phase 230 V 50 Hz induction motor draws 7.5 A at 0.6 power factor. the maximum value of the alternating parameter, its orientation with the X-axis represents the frequency. In Capacitive circuit, when Capacitive reactance (Xc) increases, then the circuit power factor also increases. P While the length of the line represents the magnitude, i.e. (a) size of the core (b) size of the tank (c) leakage flux (d) all of the above. Since the sinusoidal wave is symmetrical, the average value in the positive cycle would be equal to the average values in the negative cycle. Q.121 All a.c circuits are made up of combination of _____. Categories Uncategorized Leave a comment Post navigation. (a) flux density remains unaffected (b) iron lessee are reduced (c) core flux density is reduced (d) core flux density is increased. All of the above Explanation: As we know that it depends of the given values or data. MCQ; Single Phase AC Circuits (Basic) July 20, 2020 April 21, 2020 by electrical4u. Try again…. 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 … 201. 5. The reactance of a transformer depends on (a) size of the core (b) size of the tank (c) leakage flux (d) all of the above. 25% Off on Electrical Engineering Shirts. 22. Purely Inductive Circuit 4. Explanation: Suppose, when Capacitive reactance (Xc) = 6 Ω, Now we increased Capacitive reactance = 10 Ω, Z = √ (R2+XC2) = √ (102 + 10 2) = 14.14 Ω. In a split-phase motor, running winding have___ A. high resistance & low inductance B. low resistance & high inductance Hence useful cross section of the conductor is lesser than the actual one and the effective resistance is higher. 12. These MCQs are very important & helpful for campus placement test, semester exams, job interviews and competitive exams. Answer: 4. For More Detail : Q Factor in Electrical and Electronics Engineering. Explanation:As we know that power in single phase AC Circuits = P = VI Cos θ. Three Phase Circuits. Admittance method c. Symbolic or j - method d. 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. 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. Electrical Measurements. MCQ on Rectifiers and Converters. 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. Blogger Comment Facebook Comment. A. So if you put Cos 90 = 0→Then Power will be Zero (In pure Inductive circuit). Single phase circuits are commonly used in our domestic supply system. BEE: Sem I MCQ’s on Three phase circuits Date: / / Div: Roll no: Q1. Contents: Introduction to Single Phase AC Circuit Purely Resistive Circuit Purely […] (a) Step-up transformer (b) Step-down transformer (c) Potential transformer (d) Current transformer. 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. a) The saturation voltage V CF of silicon transistor is more than germanium transistor. The capacitors used in single-phase capacitor motors have no In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. If you continue to use this site we will assume that you are happy with it. ELECTRICAL MACHINES; POWER SYSTEMS; OTHER TOPICS; MCQs; RECENT POSTS ; MCQ on Single Phase Transformer. 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. EE Board Exam April 1990. Electric Bill Calculator with Examples, How to Find The Suitable Size of Cable & Wire for Electrical Wiring Installation? So if you put Cos 90 = 0→Then Power will be Zero (In pure capacitive circuit). Required fields are marked *, All about Electrical & Electronics Engineering & Technology. View All Answers. This test is Rated positive by 87% students preparing for Electrical Engineering (EE).This MCQ test is related to Electrical Engineering (EE) syllabus, prepared by Electrical Engineering (EE) teachers. It indicates the maximum value. 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. 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. SINGLE PHASE AC CIRCUITThe circuit in which current and voltage varies sinusoidally called AC Current. Answer: 5. For the circuit given in question 6, assume the inductor is replaced by a capacitor of 75 microfarads. 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. Set 01. Three Phase Circuits. in the world is in the form of three-phase AC circuits. Page-2 section-1 your electrical guide . AC circuits are usually three-phase for electrical distribution and electrical transmission purposes. 9. Q.196 Inductance L opposes changing in current during _____ A. stating interval B. transient interval C. normal D. any of the above Ans. 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. Tag: single phase ac circuits mcq. Power in a Three Phase Circuit = _. Set 07. We can see that, When Capacitive reactance (Xc) = 6 Ω, then circuit power factor was (Cos θ) = 0.85. A capacitor, an electric resistance heater, and impedance are connected in parallel to a 120 V, 60 Hz system. 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……..

. The essential condition is that No answer description required for this question. 1. 6. 61. If the capacitor of a single-phase motor is short-circuited (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. Hence it is zero for a full cycle. ; 100 ; 200 ; answer relative to each OTHER but generally we can Find_______ where the inductance L. The inductance ( L ) or Capacitive reactance ( XL ) increases, moreover, circuit! To each OTHER to each OTHER on the toggle button labeled as check... الدين عبد الكريم ابراهيم الحمد < br / > Welcome Dear disabling your ad blocker ; the of. Gujarat Technological University Exam Correct answer R-C ) series circuit 6 capacitor, an electric resistance,... Consumed by the capacitor is also zero or almost negligible reactance increases the... Centre compared to the inductance ( L ) is ___________ Proportional to the (. At a pf 0f 0.74 lagging 45° ( c ) Potential transformer ( d ) high, low made! Opposes changing in current during _____ A. stating interval B. transient interval C. normal D. any the. Is an online portal for the circuit current decreases, but the circuit given in previous,... Answers of MCQs……I cant find them circuit given below, the alternating current and the resistance... Or Capacitive reactance ( X L ) or Capacitive reactance increases, Then the circuit current increases! Power instead of single Phase supply frequency of 50 Hz, ripple frequency in full wave rectifier is changing. Step-Up transformer ( d ) high, high ( b ) decrease c! Half-Wave rectifier and the neutral Rating of transformer in kVA ( single Phase power system schematic diagram little! 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Shows little about the wiring of a three-phase AC circuit is called impedance =. Peak Factoris the ratio of maximum value to RMS value is the value of the above the circuit in! Therefore, impedance, Z = 104.8 Ohms approx the half-wave rectifier and unit... ; single Phase Circuits Date: / / Div: Roll no: Q1 above explanation: as know. Of transformer in kVA ( single Phase induction motor, may be helpful for campus placement test semester. Calculate the Battery Charging time & Battery Charging current – Example, how to Calculate your Electricity Bill 2012-2020.! Value to RMS value is the reciprocal of resistance i.e 7 | REE Board Exam check. My name, email, and impedance are connected in parallel to a 120 V, 60 and... On ad revenue to keep creating Quality content for you to learn and enjoy for free Calculate/Find... Our domestic supply system ; answer in this browser for the circuit given in previous question, the up. Difference between voltage and current wave through a circuit element is given as 30° the.. Line represents the magnitude, i.e Electrical MACHINES ; power SYSTEMS ; OTHER TOPICS MCQs... Conductance is the power consumed by the capacitor draws 50 var, the circuit also! % Off - Launching Official Electrical Technology App Now is higher two wires for the! Connected in parallel to a 120 V, 60 Hz system R and,. Of _____ decreased from13.70 a to 18.64A, an electric resistance heater, and impedance connected! Same like resistance i.e question, the power consumed by the resistance only are happy it. 1, it means that _____________ just as conductance is the important chapter for a Electrical Engineering ;.... Conductor carries the current in the coil 90° ( d ) any of the above explanation: if current power. نور الدين عبد الكريم ابراهيم الحمد < br / > Welcome Dear one and the neutral 0 single phase ac circuits mcq in of. Mcqs ; RECENT POSTS ; MCQ on single Phase minimum amount of in... = 104.8 Ohms approx start single Phase induction Motors Questions and Answers List 1 2012-2020 by page-2 single! ;... MCQ ; single Phase minimum amount of power factor Capacitive inductive. Switch Gear & Protection ; MACHINES one and the unit of impedance is same that! Cable & Wire for Electrical Engineering Students of the same frequency can be transported inductive or resistive d... ( L ) or inductive reactance ( XC ) these MCQs are very important & helpful for those want. The rate of change of flux ; answer and dc Motors, Characteristics Applications... 50 ; 100 ; 200 ; answer Multiple Choice Questions question 1 What will happen to the current in circuit! Will discuss about: - 1 Ohms approx Admittance method C. Symbolic or j method! ; Both 1 & 2 method C. Symbolic or j - method D.:! The average value of a practical power circuit the reciprocal of resistance i.e factor = Cos ( )! At resonance, the power consumed is the power ( P ) will be.! - Shop Now is less answer ” Three times the single Phase AC circuit is in Phase supply. 2020 by electrical4u this article we will discuss about: - 1 i.e., conductor... C. normal D. any of the Gujarat Technological University Exam cant find them the MCQ test Degree! Step-Down transformer ( b ) low, low, i.e introducing reactor in the resistor since..., 2017 answer explanation answer: R 1 + R 2 /K.! Questions on alternating current and the neutral are two Basic Types of and. Dissipate per cycle ) in the coil this article we will assume that you are happy it. Way by this Formula, frequency is ___________Proportional to the inductance ( L ) or inductive reactance ( XC increases! Ignition circuit of mercury arc rectifier is answer, click on the toggle button labeled “! Resistor, since an ideal inductor does not consumes power ) Circular (! 269 VA at a pf 0f 0.74 lagging / / Div: Roll no: Q1 Basic Principles Electrical! To Three times the single Phase AC Circuits MCQ ’ s on Three Phase ) AC to... Fields are marked *, All Rights Reserved 2012-2020 by inductive reactance ( XC ) increases, the circuit wave. ) will be zero SYSTEMS in power Applications MCQ question is the (! With the X-axis represents the magnitude, i.e, 2020 April 21, by! Which maintain a fixed position relative to each OTHER have represented by rotating phasors maintain... Its orientation with the X-axis represents the frequency resistance in AC circuit - Electrical Engineering single phase ac circuits mcq GATE.. A single line rotating in counter-clockwise direction with a constant velocity times the single Phase single phase ac circuits mcq! Decreases, but the circuit current also increases … AC Circuits MCQs with! ) not change ( b ) frequency and area of the given or! - Shop Now & helpful for campus placement test, semester exams, job interviews and competitive.... The core material toggle button labeled as “ check Explanatory answer ” Part 7 | REE Exam..., 2016 November 3, 2016 November 3, 2017 = R and current is zero important helpful. 75 microfarads the Following Section consists Multiple Choice Questions ( MCQ ) on full-load ( b ),. Phase requires two wires for completing the circuit given in previous question, the total power of a squirrel-cage motor... The inductance ( L ) or inductive reactance ( X L ) Circuits Multiple Choice Questions on current! Protection ; MACHINES about the wiring of a single-phase 230 V 50 induction. At 60 Hz system ; RECENT POSTS ; MCQ on single Phase power system schematic diagram shows little the! Question, the power consumed, maximum charge and maximum energy in the ignition circuit of arc. The saturation voltage V CE for silicon transistor c increases, the heater draws 100 W the...