23. In case of Inductive Circuit (*XL = Inductive Reactance), Impedance = Z =√ ( R2+XC2) … in Case if Capacitive Circuit (*Xc = Capacitive Reactance). 64. Page-2 section-1 Consider the sinusoidal alternating current signal given below. 14. Conceicao Rodrigues College of Engineering. In a Capacitive circuit, when Capacitance (C) increases, ( the circuit current also increases), then the circuit power factor ________? Take the Quiz and improve your overall Engineering. If Current and Voltage are 90 Degree Out of Phase, Then The Power (P) will be__________. Substituting the corresponding values, we get, Z = 104.8 Ohms approx. 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. The single phase supplies the voltage up to 230 volts. Reciprocal of Power Factor = _________? mcq on single phase transformer. (a) same efficiency (b) same polarity (c) same kVA rating (d) same number of turns on the secondary side. Dear..Did you check it properly…???? Answer:              5. The capacitors used in single-phase capacitor motors have no Set 08. P = 3 V Ph I Ph CosФ; P = √3 V L I L CosФ; Both 1 & 2. Single Phase Motors Part One Instructions: Click the answer button to see the correct answer. MCQ Test-02. MCQ on Rectifiers and Converters. 3 phase induction motor. SERIES CIRCUITS. Therefore Cos θ = P / V I ===> Cos θ = P (in Watts) / V I (in Volt- Ampere) ===> Cos θ = W/VI . 2. Three-Phase Systems In Power Applications MCQ question is the important chapter for a Electrical Engineering and GATE students. Jan 08,2021 - Test: Single Phase HW AC-DC - 2 | 20 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. A. 1. Determine the system power factor. 10. Answer: (c) … ⇐ MCQ in AC Circuits Part 4 | REE Board Exam . EE-Tools, Instruments, Devices, Components & Measurements, A Complete Guide About Solar Panel Installation. Explanation: Suppose, when Capacitive reactance (Xc) = 6 Ω, Now we increased Capacitive reactance = 10 Ω, Z = √ (R2+XC2) = √ (102 + 10 2) = 14.14 Ω. (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. None of The Above; Show Explanatory Answer . Single Phase AC Circuits MCQs ( With Explanatory Answers). In inductive circuit, when Inductance (L) or inductive reactance (XL) increases, the circuit current decreases, but the circuit power factor ________? Admittance: The Admittance is defined as the reciprocal of impedance just as conductance is the reciprocal of resistance i.e. The Following Section consists Multiple Choice Questions on Alternating Current and Voltage. but generally we can find all these quantity this way by this formula. In inductive circuit, when Capacitance C increases, the circuit current also increases, moreover, the circuit power factor also increases. 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. 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. Purely Inductive Circuit 4. AC Circuits Multiple Choice Questions. The phase difference between voltage and current wave through a circuit element is given as 30°. Step by Step Procedure with Solved Example. Ques 44. 5. Answer:          5. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) Which of the following statement is true? © www.yourelectricalguide.com/ mcq on single phase transformer. Name Email Website. (a) capacitive only (b) inductive only (c) inductive or resistive (d) none of the above. Save my name, email, and website in this browser for the next time I comment. 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: In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. Similar to an inductor, the power consumed by the capacitor is also zero or almost negligible. Contents: Introduction to Single Phase AC Circuit Purely Resistive Circuit Purely […] (a) size of the core (b) size of the tank (c) leakage flux (d) all of the above. Latest Single Phase Induction Motors Questions and Answers List 1. 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……..
. Answer:     2. 1. 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. In a split-phase motor, running winding have___ A. high resistance & low inductance B. low resistance & high inductance The conductor carries the current and the neutral is the return path of the current. In case of Inductive circuit,  inductance (L) is ___________Proportional to the  inductive reactance (XL). Three Phase AC Circuits MCQ’s with explanation. 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. So in single phase minimum amount of power can be transported. 18. 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. the maximum value of the alternating parameter, its orientation with the X-axis represents the frequency. When current across a series RLC circuit is in phase with the supply voltage, it is said to be in resonance. Primary Sidebar . 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. EE Board Exam April 1990. The purpose of using starting winding in single phase induction motor is to (a) ... MCQ or Objective. Answer: ( 3 ) EXPLANATION. Resistance R B. Capacitance C C. Inductance L D. All of the above Ans. 3 - Phase AC Circuits - Electrical Engineering (MCQ) questions and answers. value of 220 V is induced. 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. 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. 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. i.e ….. Xc ∞ 1/f Puttint (2) into (1) I = V/ (1/2πfC)…i.e ..I = V x 2πfC. Multiple Choice Questions (MCQ) on Single Phase Motors for Electrical Engineering. A capacitor, an electric resistance heater, and impedance are connected in parallel to a 120 V, 60 Hz system. ⇐ MCQ in AC Circuits Part 7 | REE Board Exam . 1. Single-Phase AC Power Circuit frequency, phase angle and phase shift, instantaneous and average power, etc. Single Phase A. C. Circuits. Filed Under: Electrical MCQ. Answer:      1. Leave a Comment / Uncategorized / By Ajay Sharma. 25% Off on Electrical Engineering Shirts. AC Circuits Multiple Choice Questions Question 1 What will happen to the current in this circuit as frequency increases? Set 10. For More Detail : Q Factor in Electrical and Electronics Engineering. Using P=VI Cos φ Formula, We Can Find_______. Integrating for a half cycle, the area would be: 21. Skip to content. which will improve your skill. 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. P If Power factor = Cos θ = 1, it means that _____________. 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. (a) frequency (b) frequency and area of the core (c) flux density of the core material. Most of the industry operates on 3-phase power instead of single phase. If the capacitor of a single-phase motor is short-circuited Inversely  Explanation: So, in a capacitive circuit, frequency is inversely proportional to the Capacitance (C) and Capacitive reactance (Xc). Definition of Single phase. b) The saturation voltage V CE for germanium transistor is more than silicon transistor. 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. Thanks for positive feedback. When it is necessary to change ac voltage to dc voltage, it is generally done with Phase rectifiers. Answer:          5. In a split phase motor, the running winding should have (a) high resistance and low … (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. BEE: Sem I MCQ’s on Three phase circuits Date: / / Div: Roll no: Q1. 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. So  If Current and Voltage are 90 Degree Out of Phase, Then The Power (P) will be zero. which will improve your skill. 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. Theangle θ  between Voltage and Current is Zero Explanation: We know that Power factor = Cos θ  Given value of Power factor is = 1. We depends on ad revenue to keep creating quality content for you to learn and enjoy for free. All of the above Explanation: As we know that it depends of the given values or data. (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. 351. mcq on single phase induction motor. Power Factor Correction Calculator – How to Find P.F Capacitor in µF & kVAR? Follow, © Copyright 2020, All Rights Reserved 2012-2020 by. Leave a Comment Cancel reply. your electrical guide . The  angle (θ) between Voltage and Current is Zero. For a straight conductor, the alternating current produces a magnetic flux, which is more at the centre compared to the surface. The RMS value is the value of that electrical parameter which would produce the same amount of heat in the circuit its DC counterpart. A single-phase 230 V 50 Hz induction motor draws 7.5 A at 0.6 power factor. Required fields are marked *, All about Electrical & Electronics Engineering & Technology. View MCQ_three phase.docx from IT 69 at Fr. 61. 2. The essential condition is that SINGLE PHASE INDUCTION MOTORS Multiple Choice Questions :-1. – Examples in British and SI System, Thevenin’s Theorem. Purely Resistive Circuit 3. I.e, Cosθ = Cos (0) = 1. How to Calculate/Find the Rating of Transformer in kVA (Single Phase and Three Phase)? Choose the letter of the best answer in each questions. 22. Thus current is more at the outer surface where the inductance is less. The power consumed, maximum charge and maximum energy in the circuit is————respectively. It is represented by Z and the unit of impedance is same like resistance i.e. Apparent Power, True Power, Reactive Power and Power Factor. (a) Step-up transformer (b) Step-down transformer (c) Potential transformer (d) Current transformer. Average power consumed is the power consumed in the resistor, since an ideal inductor does not consumes power. This causes inductance to be more at the centre than at the surface. 1. 1. In Capacitive circuit, when Capacitive reactance (Xc) increases, then the circuit power factor also increases. Introduction to Single Phase AC Circuit 2. Categories Uncategorized Leave a comment Post navigation. 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. Answer: (3)…Both 1 & 2. Categories Uncategorized Leave a comment Post navigation. this guide covers three phase ac circuits multiple choice questions with answers and explanation. Opposite of Power factor is called the Q-Factor or Quality Factor of a Coil or its figure of merit. Electrical Measurements. 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 ________________. Single Phase A. C. Circuits. Our website is made possible by displaying online advertisements to our visitors. In This poat, we are going to share Multiple Choice Questions (MCQ) on AC Fundamentals for Electrical Engineering Students. Single phase power system schematic diagram shows little about the wiring of a practical power circuit. Also Q = 2π (Maximum Energy Stored/Energy dissipate per Cycle) in the coil. Single Phase AC Circuits MCQs ( With Explanatory Answers) 1. 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. Xc = 1/2πfC ….(2)….. In case of Inductive circuit, Frequency is _____Proportional to the inductance (L) or inductive reactance (X L). Get free Android App | Download Electrical Technology App Now you continue use... The preparation of the Electrical parameter which would produce the same amount of power factor also increases s with.... Inductance increased from 0.02H to 0.04 H, Then the power consumed is—- Phase Then. Is: peak Factoris the ratio of maximum value to RMS value total power of a practical circuit... - Electrical Engineering Students of the conductor carries the current in the ignition circuit of mercury arc rectifier is limit! Complete Guide about Solar Panel Installation included complete & detailed analysis of power factor of a practical circuit! By rotating phasors which maintain a fixed position relative to each OTHER & Protection ; MACHINES are... Inductive only ( c ) increase ( d ) Rectangular type three-phase AC system consists of generators. Generators, transmission lines, and impedance are connected in parallel to a 120 V 60! A sinusoidal waveform is: peak Factoris the ratio of maximum value RMS! Part 4 | REE Board Exam R 2 /K 2 and enjoy for free impedance... This poat, we are going to share Multiple Choice Questions ( MCQ ) and. The Correct answer the full-load torque 3 more at the centre than at centre... Constant velocity at 60 Hz system Engineering and GATE Students as frequency?! Supporting us by disabling your ad blocker & kVAR also decreases / > Welcome Dear opposes changing in during! Dc Motors, Characteristics and Applications, AC generators system, Thevenin ’ s Theorem ; Switch &. Increased from 0.02H to 0.04 H, Then the power consumed by the resistance only assume you... And Electronics Engineering & Technology 50 var, the power ( P ) will be.! Is zero ⇐ MCQ in AC Circuits MCQ ’ s with explanation properly…?????... The Electrical parameter which would produce the same amount of heat in the ignition circuit mercury! Circuits = P = VI Cos θ power of a sine wave using single... Q = 2π ( maximum energy Stored/Energy dissipate per cycle ) in the circuit, when Capacitance ( )... Circuit 6 with it also increases All these quantity this way by this Formula of! Current during _____ A. stating interval B. transient interval C. normal D. of! Current, I = V/Z = 1.9 Amperes, 25 consumed, charge. Line represents the magnitude, i.e L ) عبد الكريم ابراهيم الحمد < br / > Welcome.... The unit of Admittance is Siemens and its unit symbol is S. What is Admittance and does... To keep creating Quality content for you to learn and enjoy for.. 1 - Phase AC Circuits MCQ ’ s Theorem choose the letter of the given or... ) between voltage and current wave through a circuit element is given 30°... Ohm ) where is, impedance = Z =√ ( R2+XL2 ) … a single-phase 230 50... Happy with it on our website is made possible by displaying online advertisements to our visitors ( R2+XL2 …., Devices, components & Measurements, a complete Guide about Solar Panel Installation Phase requires two wires for the. Magnetic flux, which is more than full-load torque 3 in resonance conductor. 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Will usually have a power factor also decreases here are some practice MCQ for Phase. Inductive or resistive ( d ) high, high ( c ) increase ( )! To 0.04 H, Then the power is __________ inductance is less 1/2πfC.. The approximate value of a squirrel-cage induction motor will usually have a power factor = Cos ( 0 ) 500µF! 50 var, the area would be: 21 the neutral in each Questions of current, I = =... A capacitor of a practical power circuit, Cosθ = Cos θ ) P Phase. ___________ Proportional to the current using same phasor Detail: Q factor in Electrical Electronics... Find P.F capacitor in µF & kVAR C. normal D. any of the best answer in each.... Ac Fundamentals for Electrical wiring Installation power consumed, maximum charge and maximum energy Stored/Energy per. Ac CIRCUITThe circuit in which current and voltage varies sinusoidally called AC current ; 50 ; ;. Panel Installation: R 1 + R 2 /K 2 All the instant values of the MCQ of! 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Symbolic or j - method D. advertisements: in this circuit as frequency increases the than. ( θ ) between voltage and current wave through a circuit element is as... Are made up of combination of _____ using P=VI Cos φ Formula, we get, Z single phase ac circuits mcq 104.8 approx... Calculate it to 18.64A for you to learn and enjoy for free ( L ) when it is to... Necessary to change AC voltage to dc voltage, the alternating parameter, orientation! As frequency increases s on Three Phase AC Circuits ( Basic ) July 20, 2020 electrical4u! This site we will discuss about: - 1 Types of 3-phase rectifiers: overall. 0.04 H, Then current decreased from13.70 a to 18.64A signal is ————-for a full.! Is, impedance, current and voltage are 90 Degree Out of Phase, Then the circuit power factor components. & detailed analysis of power can be transported approximate value of reactance, impedance, Z = Ohms! To an inductor, the total power of a sine wave using a line... Systems are used frequently than series AC SYSTEMS answer in each Questions arc rectifier is to. Of current, I = V/Z = V/R ) Cylindrical type ( b 45°. _____ A. stating interval B. transient interval C. normal D. any of the Gujarat Technological University Exam averaging... By a capacitor, an electric resistance heater, and loads Choice (! It means that _____________ ) current transformer its figure of merit *, about., All about Electrical & Electronics Engineering thus current is in Phase with the supply voltage, means... Use this site we will assume that you are happy with it electric resistance heater, and Vice.. Electrical Distribution and Electrical transmission purposes POSTS ; MCQ on single Phase power schematic! > Welcome Dear area of the core material it means that _____________ True power Reactive. Symbolic or j - method D. advertisements: in this circuit as frequency increases high high. Consists Multiple Choice Questions RLC circuit at resonance, the conductor is lesser than actual!, click on the toggle button labeled as “ check Explanatory answer ” What is Admittance and how Calculate. ) July 20, 2020 April 21, 2020 by electrical4u representation of a three-phase AC circuit - Engineering! Difference between voltage and current wave through a circuit element is given as 30° answer. Called the Q-Factor or Quality factor of a sine wave using single phase ac circuits mcq line. And loads MCQ in AC Circuits are commonly used in single-phase capacitor Motors have no ⇐ MCQ in Circuits... Slightly more than silicon transistor is same like resistance i.e impedance are connected in parallel to 120. All of the best experience on our website is made possible by displaying online advertisements our... ), f=50Hz counter-clockwise direction with a constant velocity have to select the answer. A sinusoidal alternating signal is ————– instead of single Phase induction Motors Questions and Answers List 1 in parallel a. To see the Correct answer sinusoidal waveform is: peak Factoris the of. - Electrical Engineering and GATE Students Phase supply frequency of 50 Hz, ripple in... 0F 0.74 lagging ) Sandwich type ( d ) any of the best in. Voltage varies sinusoidally called AC current Gujarat Technological University Exam torque slightly more than torque. Topics ; MCQs ; RECENT POSTS ; MCQ on single Phase induction motor may.