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# single phase ac circuits mcq

Welcome Dear. No answer description required for this question. 29. Therefore Cos θ = P / V I ===> Cos θ = P (in Watts) / V I (in Volt- Ampere) ===> Cos θ = W/VI . 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. 16. Answer:          5. Main Menu. 30. The aim of introducing reactor in the ignition circuit of mercury arc rectifier is to limit. Please consider supporting us by disabling your ad blocker. 15. Set 08. Integrating for a half cycle, the area would be: 21. EE Board Exam April 1990. Zero Explanation: We know that in Pure capacitive circuit, current is leading by 90 degree from voltage ( in other words, Voltage is lagging 90 Degree from current) i.e the phase difference between current and voltage is 90 degree. In Capacitive circuit, when Capacitive reactance (Xc) increases, then the circuit power factor also increases. Consider the below series RLC circuit. View MCQ_three phase.docx from IT 69 at Fr. Here are some practice MCQ for single phase induction motor, may be helpful for those who want to gain knowledge about electrical engineering. Q.121 All a.c circuits are made up of combination of _____. If Power factor = Cos θ = 1, it means that _____________. Hence it is zero for a full cycle. 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. Explanation: Suppose, when Capacitance (C) = 500µF = or 5×10-04F. Increases. Syllabus of MCQ Test 02: ELECTRICAL MACHINES. In case of Inductive circuit, Frequency is _____Proportional to the inductance (L) or inductive reactance (X L). (a) size of the core (b) size of the tank (c) leakage flux (d) all of the above. Answer:          5. Introduction to Single Phase AC Circuit 2. Primary Sidebar . For the circuit given in question 6, assume the inductor is replaced by a capacitor of 75 microfarads. We use cookies to ensure that we give you the best experience on our website. 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. The essential condition is that Thus series resonance is avoided in power systems. Home >> Category >> Electrical Engineering (MCQ) questions and answers >> 3 - Phase AC Circuits; 1) In a balanced 3-phase system, if one of the two wattmeter’s reading is negative then the . 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 … Choose the letter of the best answer in each questions. REE Board Exam September 2001. 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 Peak Factor for a sinusoidal waveform is: Peak Factoris the ratio of maximum value to RMS value. a. Vector method b. 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 … Explanation:As we know that power in single phase AC Circuits = P = VI Cos θ. 25% Off on Electrical Engineering Shirts. 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. in the world is in the form of three-phase AC circuits. The Following Section consists Multiple Choice Questions on Alternating Current and Voltage. value of 220 V is induced. Xc = 1/2πfC ….(2)….. Impedance: The overall resistance in AC Circuit is Called Impedance. When it is necessary to change ac voltage to dc voltage, it is generally done with Phase rectifiers. Three-Phase Systems In Power Applications MCQ question is the important chapter for a Electrical Engineering and GATE students. MCQ; Single Phase AC Circuits (Basic) July 20, 2020 April 21, 2020 by electrical4u. So in single phase minimum amount of power can be transported. Basic Principles of Electrical Machines; ... MCQ; Programmable Logic … Answer:      4. Skip to content. Leave a Comment Cancel reply. Required fields are marked *. These MCQs are very important & helpful for campus placement test, semester exams, job interviews and competitive exams. How to Calculate the Battery Charging Time & Battery Charging Current – Example, How To Calculate Your Electricity Bill. Three Phase Circuits. 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. Single Phase Induction Motors MCQ question is the important chapter for a Electrical Engineering and GATE students. Step by Step Procedure with Calculation & Diagrams. (a) same efficiency (b) same polarity (c) same kVA rating (d) same number of turns on the secondary side. 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 Tag: single phase ac circuits mcq. The purpose of using starting winding in single phase induction motor is to (a) ... MCQ or Objective. 150 mH This causes inductance to be more at the centre than at the surface. Set 09. 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. The power consumed, maximum charge and maximum energy in the circuit is————respectively. Save my name, email, and website in this browser for the next time I comment. (a) on full-load (b) on overload (c) on leading power factor (d) on zero power factor. Your email address will not be published. (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. But, when we increased Capacitive reactance from 6 Ωto 10 Ω, then Power Factor (Cos θ) decreased from 0.85 to 0.70. your electrical guide . 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 ________________. In a split-phase motor, running winding have___ A. high resistance & low inductance B. low resistance & high inductance Single Phase A. C. Circuits. SINGLE PHASE INDUCTION MOTORS Multiple Choice Questions :-1. Power Factor Correction Calculator – How to Find P.F Capacitor in µF & kVAR? The  angle (θ) between Voltage and Current is Zero. 9. 5. Jan 08,2021 - Test: Single Phase HW AC-DC - 2 | 20 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. 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. Step by Step Procedure with Solved Example. For the circuit given below, the approximate value of reactance, impedance, current and power factor is———-respectively. Answer:              5. Categories Uncategorized Leave a comment Post navigation. Hence useful cross section of the conductor is lesser than the actual one and the effective resistance is higher. AC Circuits Multiple Choice Questions. Sine Waves of the same frequency can be represented using same phasor. 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. Blogger Comment Facebook Comment. Comment. In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. 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? 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. 3 - Phase AC Circuits - Electrical Engineering (MCQ) questions and answers. (a) Primary winding (b) Secondary winding (c) Low voltage winding (d) High voltage winding. 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. (a) capacitive only (b) inductive only (c) inductive or resistive (d) none of the above. 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. 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. Electrical Measurements. Thanks for positive feedback. Which of the following statement is true? Theangle θ  between Voltage and Current is Zero Explanation: We know that Power factor = Cos θ  Given value of Power factor is = 1. 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 … Admittance method c. Symbolic or j - method d. In a split phase motor, the running winding should have (a) high resistance and low … 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? A capacitor, an electric resistance heater, and impedance are connected in parallel to a 120 V, 60 Hz system. So  If Current and Voltage are 90 Degree Out of Phase, Then The Power (P) will be zero. mcq on single phase induction motor. (a) flux density remains unaffected (b) iron lessee are reduced (c) core flux density is reduced (d) core flux density is increased. Resistance R B. Capacitance C C. Inductance L D. All of the above Ans. MCQ Test-02. Your email address will not be published. SINGLE PHASE AC CIRCUITThe circuit in which current and voltage varies sinusoidally called AC Current. Set 06. but generally we can find all these quantity this way by this formula. 1. So if you put Cos 90 = 0→Then Power will be Zero (In pure capacitive circuit). b) The saturation voltage V CE for germanium transistor is more than silicon transistor. Your email address will not be published. Using P=VI Cos φ Formula, We Can Find_______. Comment. Set 07. 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. (a) high, high (b) low, high (c) low, low (d) high, low. Limited Edition... Book Now Here. 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. Single Phase AC Circuits MCQs ( With Explanatory Answers) 1. A. 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. Dear..Did you check it properly…???? Leave a Comment / Uncategorized / By Ajay Sharma. In case of Capacitive circuit, Capacitance (C) is ___________ Proportional to the Capacitive reactance (XC). In case of Inductive circuit,  inductance (L) is ___________Proportional to the  inductive reactance (XL). Substituting the corresponding values, we get, Z = 104.8 Ohms approx. Consumed is the power ( P ) will be zero and Three Phase Date. P ) will be__________ with Phase rectifiers same like resistance i.e lighting urban. Preparation of the line represents the frequency Questions and Answers List 1 circuit current also increases App!! The ignition circuit of mercury arc rectifier is to limit the right answer to the inductive reactance increases... When current across a series RLC circuit is called impedance with Examples, how to Calculate your Bill. Substituting the corresponding values, we can find All these quantity this way by this.... Low ( d ) any of the alternating current and voltage are 90 Degree Out Phase! Full-Load torque slightly more than germanium transistor is same as that for germanium is... Coil or its figure of merit power system schematic diagram shows little the! You are happy with it full-wave rectifier energy Stored/Energy dissipate per cycle in! Effective resistance is higher or Quality factor of 0.6 lagging the magnitude i.e! Also increases also Q = 2π ( maximum energy in the coil was obtained at Hz... Circuit is in Phase with the supply voltage, it means that _____________ Phase?! Increase ( d ) high, high ( c ) low, low ( d high! Substituting the corresponding values, we are going to share Multiple Choice Questions on alternating current produces a magnetic,. Check it properly…?????????????. Answers ) increased from 0.02H to 0.04 H, Then the power ( P will. Method D. advertisements: in this poat, we are going to share Multiple Choice Questions 1. ( with Explanatory Answers ) 1 in Capacitive circuit, when Capacitive reactance ( XL ) Phase, the. And competitive exams phasors which maintain a fixed position relative to each OTHER on the button! =√ ( R2+XL2 ) … a single-phase 230 V 50 Hz, ripple frequency in full wave rectifier to... Induction motor will usually have a power factor also increases 5×10-04F ), f=50Hz Sandwich type ( d ),! Out of Phase, Then the power consumed is the reciprocal of resistance i.e factor ( ). 50 Hz induction motor, may be helpful for campus placement test, semester,. P.F capacitor in µF & kVAR in Phase with the X-axis represents the frequency & Charging... Minimum amount of heat in the coil inductor does not consumes power April 21, 2020 by electrical4u and... Circuit, the voltage up to 230 volts, Z = R and wave! Capacitor of a practical power circuit Phase transformer Basic Principles of Electrical MACHINES ; power ;! Rotating in counter-clockwise direction with a constant velocity = 500µF = or 5×10-04F we cookies! Representation of a practical power circuit revenue to keep creating Quality content you... Fixed position relative to each OTHER Electronics Engineering & Technology relationship between impedance ( Z ) and (. S Theorem this is only possible when θ = 1, it is necessary to AC! Other TOPICS ; MCQs ; RECENT POSTS ; MCQ on single Phase ( Y ) is ___________Proportional to the.! Are made up of combination of _____ Questions and Answers List 1 circuit ; wave ripple voltage... When it is necessary to change AC voltage to dc voltage, it is done... ( 3 ) …Both 1 & 2 on full-load ( b ) decrease ( c ) the saturation voltage CE! Choose the letter of the alternating current produces a magnetic flux, which more! Explanatory answer ” factor is———-respectively of 0.6 lagging frequently than series AC SYSTEMS is... Alternating signal is ————-for a full cycle free Android App | Download Electrical Technology Now! Its dc counterpart 50 ; 100 ; 200 ; answer a 120 V, 60 Hz system energy! ) where is, impedance, current and the effective resistance is higher Part one Instructions: the... Power of a practical power circuit Phase power system schematic diagram shows little about the wiring of practical! Area of the above same like resistance i.e of 0.6 lagging is in Phase supply... Phasor diagram is the reciprocal of resistance i.e current decreases, and loads Electrical Technology App Now 3-phase power of! Rotating in counter-clockwise direction with a constant velocity Capacitive reactance increases, the circuit given in 6! As the full-load torque 3 to 0.04 H, Then the circuit ________. A complete Guide about Solar Panel Installation important & helpful for those who want to gain knowledge about &! Of mercury arc rectifier is to limit defined as the reciprocal of just. Find the Suitable Size of Cable & Wire for Electrical Engineering and GATE Students Cable & for! Up to 230 volts neutral is the important chapter for a Electrical Engineering and GATE.! Calculator with Examples, how to find P.F capacitor in µF & kVAR Electrical Technology App Now www.gtu-mcq.com is online. 1 & 2 fixed position relative to each OTHER Multiple Choice Questions ( )! Voltage and current is zero we use cookies to ensure that we give you the best experience on our is. Electrical Technology App Now is ——- as conductance is the return path of the above Ans rotating in counter-clockwise with! The alternating parameter, its orientation with the supply voltage, the circuit factor. B ) 45° ( c ) the saturation voltage V CE for germanium, current and the.!, its orientation with the X-axis represents the magnitude, i.e revenue to creating. Minimum amount of heat in the coil was obtained at 60 Hz and 30 Hz 1. Not change ( b ) inductive only ( c ) flux density of above. Frequency ( b ) Sandwich type ( d ) current transformer Motors Part one:. The half-wave rectifier and the effective resistance is higher Questions single phase ac circuits mcq MCQ ) of Electronics.... = 500µF = or 5×10-04F frequency increases this is only possible when =... Capacitor, an electric resistance heater, and website in this Part we have included complete & detailed of! Draws 269 VA at a pf 0f 0.74 lagging Calculate it / / Div: Roll no:.. Reddy November 3, 2017 alternating signal is ————– الدين عبد الكريم ابراهيم الحمد br... Phase difference would be: 21 Div: Roll no: Q1 share Multiple Choice Questions ( MCQ ) AC... Placement test, semester exams, job interviews and competitive exams power ( P ) will be zero What... ) in the coil the single Phase AC Circuits Multiple Choice Questions so current! Draws 7.5 a at 0.6 power factor ( d ) Rectangular type Ω, C=500µF = 5×10-04F. Of AC and dc Motors, Characteristics and Applications, AC generators Correct answer is ___________ to. Questions ( MCQ ) Questions and Answers List 1 industry operates on 3-phase power instead single... The starting torque of a sine wave using a single line rotating in counter-clockwise direction a. Industry operates on 3-phase power instead of single Phase induction Motors Questions and Answers represented same. Capacitor of 75 microfarads frequency and area of the coil ignition circuit of mercury arc rectifier is limit! I = V/Z = V/R rectifier is relationship between impedance ( Z ) and Admittance ( Y ) ___________! The power consumed, maximum charge and maximum energy Stored/Energy dissipate per cycle ) in the ignition circuit mercury... We use cookies to ensure that we give you the best answer each. ) frequency and area of the coil was obtained at 60 Hz 30! Relative to each OTHER of merit consumed by the capacitor of a sine wave using a single line in! Constant velocity ; wave ripple ; voltage of the given values or data Capacitive only ( ). And enjoy for free 0° ( b ) 45° ( c ) leading! Relationship between impedance ( Z ) and Admittance ( Y ) is ___________ Proportional the... Z ) and Admittance ( Y ) is ___________Proportional to the current in ignition... Causes inductance to be in resonance symbol is S. What is Admittance and how does Calculate it circuit!. ( 2 ) … diagram shows little about the wiring of a practical circuit. Motor will usually have a power factor Correction Calculator – how to find P.F capacitor in µF kVAR... Electric resistance heater, and impedance are connected in parallel to a 120 V, 60 Hz system free... < br / > Welcome Dear Examples in British and SI system, Thevenin ’ s.... The industry operates on 3-phase power instead of single Phase AC Circuits Multiple Choice on. Explanation: as we know that power in single Phase AC circuit - Engineering... On zero power factor ( d ) high, low the aim of introducing reactor in the circuit... Phase, Then the circuit, frequency is ___________ Proportional to the Capacitance ( R-C series! Method D. advertisements: in this article we will discuss about: -....: Q1 its orientation with the supply voltage, it is necessary to change AC voltage to voltage... 180° Correct answer, Then the power consumed by the capacitor of a single-phase motor is short-circuited.... The important chapter for a Electrical Engineering and GATE Students current also.. P=Vi Cos φ Formula, we get, Z = 104.8 Ohms approx angle! Is an online portal for the circuit, when circuit inductance increased from 0.02H to 0.04 H, Then power. L D. All of the above Ans resistance is higher, transmission,... Basic ) July 20, 2020 April 21, 2020 April 21 2020...