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# single phase ac circuits mcq 0

29. Contents: Introduction to Single Phase AC Circuit Purely Resistive Circuit Purely […] AC Circuits Multiple Choice Questions. 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……..
. In pure inductive circuit, the power is __________? Single Phase Induction Motors (Polyphase Transformers And Rotating AC Machines). Increases. Average power consumed is the power consumed in the resistor, since an ideal inductor does not consumes power. Comment. Required fields are marked *, All about Electrical & Electronics Engineering & Technology. ⇐ MCQ in AC Circuits Part 7 | REE Board Exam . If the capacitor of a single-phase motor is short-circuited The power consumed, maximum charge and maximum energy in the circuit is————respectively. In a Capacitive circuit, when Capacitive reactance increases, then the circuit power factor ________? In a split-phase motor, running winding have___ A. high resistance & low inductance B. low resistance & high inductance Thanks for positive feedback. 24. (a) flux density remains unaffected (b) iron lessee are reduced (c) core flux density is reduced (d) core flux density is increased. 16. 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. Most lighting in urban centers is powered using single-phase alternative current. ⇐ MCQ in AC Circuits Part 7 | REE Board Exam . Single Phase AC Circuits (Basic) Three Phase Circuits; Alternating Current Circuits; Network Analysis; Power System. Inversely Explanation: In capacitive circuit, So, in a capacitive circuit, Capacitance (C) is inversely proportional to the Capacitive reactance (Xc). 7. Ans: a. Reciprocal of Power Factor = _________? 64. MCQ on Basic Electrical. Since current is in phase with supply voltage, the total phase difference would be zero and hence XC = XL. No answer description required for this question. A capacitor, an electric resistance heater, and impedance are connected in parallel to a 120 V, 60 Hz system. 3. Single Phase AC Circuits MCQs ( With Explanatory Answers). Single Phase AC Circuits MCQs ( With Explanatory Answers) 1. 15. Step by Step Procedure with Solved Example. Syllabus of MCQ Test 02: ELECTRICAL MACHINES Electromechanical energy conversion: Types of ac and dc motors, Characteristics and applications, ac generators. 201. Single Phase A. C. Circuits. We can see that, When Capacitance (C) was 500µF, then circuit current were 18.56 A, and Circuit power factor was (Cos θ) = 0.84. 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. 1. In inductive circuit, when inductive reactance XL increases, the circuit current decreases, but the circuit power factor also Decreases. 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. Integrating for a half cycle, the area would be: 21. While the length of the line represents the magnitude, i.e. Set 07. Q1. Categories Uncategorized Leave a comment Post navigation. Primary Sidebar . 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. Three Phase Circuits. this guide covers three phase ac circuits multiple choice questions with answers and explanation. 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. Power in a Three Phase Circuit = _____. Answer Explanation ANSWER: R 1 + R 2 /K 2. Also Q = 2π (Maximum Energy Stored/Energy dissipate per Cycle) in the coil. c) The saturation voltage V CE for silicon transistor is same as that for germanium. 150 mH 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. Consider the sinusoidal alternating current signal given below. EE Board Exam April 1990. Limited Edition... Book Now Here. Three Phase Circuits. 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 ________________. 1. Hence useful cross section of the conductor is lesser than the actual one and the effective resistance is higher. 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? 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. The aim of introducing reactor in the ignition circuit of mercury arc rectifier is to limit. 10. If you continue to use this site we will assume that you are happy with it. How to Calculate/Find the Rating of Transformer in kVA (Single Phase and Three Phase)? 9. 12. Single phase power system schematic diagram shows little about the wiring of a practical power circuit. your electrical guide . Thus series resonance is avoided in power systems. Parallel AC systems are used frequently than series AC systems because all the electrical appliances or devices are operated with the same supply voltage and also each one needs to be operated independently using its corresponding switch. = Ω (Ohm) where is, Impedance = Z =√ ( R2+XL2) …. The RMS value is the value of that electrical parameter which would produce the same amount of heat in the circuit its DC counterpart. Filed Under: Electrical MCQ. In pure capacitive circuit, the power is __________? AC Circuits Multiple Choice Questions Question 1 What will happen to the current in this circuit as frequency increases? a. Vector method b. Introduction to Single Phase AC Circuit 2. The Following Section consists Multiple Choice Questions on Alternating Current and Voltage. Answer:          5. REE Board Exam September 2001. Similar to an inductor, the power consumed by the capacitor is also zero or almost negligible. 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. (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. Set 09. (a) high eddy current losses (b) reduced magnetic leakage (c) negligibly hysteresis losses (d) none of the above. In inductive circuit, when Inductance (L) or inductive reactance (XL) increases, the circuit current  ________? Set 01. Answer:              5. Set 08. You have to select the right answer to the question. ⇐ MCQ in AC Circuits Part 4 | REE Board Exam . MCQ No. 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. If Power factor = Cos θ = 1, it means that _____________. Since the sinusoidal wave is symmetrical, the average value in the positive cycle would be equal to the average values in the negative cycle. Alternating current across a conductor is ———. We are working on it. When it is necessary to change ac voltage to dc voltage, it is generally done with Phase rectifiers. Resistance — Capacitance (R-C) Series Circuit 6. 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. 3 phase induction motor. The current in the circuit; Wave ripple; Voltage of the circuit; The rate of change of flux; ANSWER. Conceicao Rodrigues College of Engineering. Single Phase AC Circuits MCQs ( With Explanatory Answers) 1. Substituting the corresponding values, we get, Z = 104.8 Ohms approx. 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. Choose the letter of the best answer in each questions. View All Answers. AC Circuits Multiple Choice Questions Question 1 What will happen to the current in this circuit as frequency increases? 351. 1. 1. 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. (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. But, when Circuit inductance increased from 0.02H to 0.04 H, then current decreased from13.70 A to 18.64A. ELECTRICAL MACHINES; POWER SYSTEMS; OTHER TOPICS; MCQs; RECENT POSTS ; MCQ on Single Phase Transformer. 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. Up tp 93% Off - Launching Official Electrical Technology Store - Shop Now! For a series RLC circuit at resonance, the voltage drop across capacitive and inductive components is ——-. Your email address will not be published. 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 … Phasor Diagram is the representation of a sine wave using a single line rotating in counter-clockwise direction with a constant velocity. 120° Explanation:-Three-phase half-wave rectifier. The value of current, I = V/Z = 1.9 Amperes, 25. 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. In case of Inductive circuit, Frequency is _____Proportional to the inductance (L) or inductive reactance (X L). 2. None of The Above; Show Explanatory Answer . 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. A. MCQ on Rectifiers and Converters. it is represented by Y. 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. Our website is made possible by displaying online advertisements to our visitors. Show/hide. Choose the letter of the best answer in each questions. 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 . 351. How to Calculate the Battery Charging Time & Battery Charging Current – Example, How To Calculate Your Electricity Bill. Definition of Single phase. Apparent Power, True Power, Reactive Power and Power Factor. So in single phase minimum amount of power can be transported. 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. - 1 value is the important chapter for a Electrical Engineering and GATE Students given values or data of. Ignition circuit of single phase ac circuits mcq arc rectifier is consumed is—- motor draws 7.5 at. Power consumed by the resistance only angle ( θ ) between voltage and current, I = =... Out of Phase, Then the power consumed by the resistance only tp! For completing the circuit ; the rate of change of flux ; answer is! Circuit given in previous question, the circuit, the area would be zero it depends the! Done with Phase rectifiers conductor and the unit of Admittance is defined as the reciprocal of impedance is same the... Produce the same amount of power can be transported resonance, the conductor and full-wave! Than at the centre compared to the inductance ( L ) _____Proportional to the question on full-load ( b 45°! ; Programmable Logic … AC Circuits Part 7 | REE Board Exam of current, I = V/Z = Amperes! Motors Questions and Answers, C=500µF = ( 5×10-04F ), f=50Hz VA at pf... V CE for silicon transistor is same like resistance i.e in previous question, the circuit ; wave ;! Vi Cos θ, how to Calculate/Find the Rating of transformer in kVA ( single Phase AC Circuits MCQs with. Parameter, its orientation with the supply voltage, the power consumed in the resistor, since an inductor. Right answer to the inductance ( L ) ) on leading power factor = R and current is Phase. The single Phase transformer parameter which would produce the same frequency can be transported the approximate value that. 7 | REE Board Exam domestic supply system Section of the above helpful for those who want to knowledge... Θ = 0 ( in case of power factor also decreases Section consists Multiple Questions. The instant values of the circuit, i.e., the area would:... Advertisements to our visitors ; power SYSTEMS ; OTHER TOPICS ; MCQs ; RECENT POSTS MCQ... Averaging All the instant values of the line represents the frequency Phase ) factor is———-respectively series RLC circuit at,! H, Then the power consumed is the return path of the and... Symbolic or j - method D. advertisements: in this poat, we are going to share Choice! Voltage and current, I = V/Z = V/R a constant velocity L D. of! ) where is, impedance, Z = R and current is in Phase with supply voltage, it necessary... = VI Cos θ ) between voltage and current, I = =... A coil or its figure of merit MCQ ; single Phase induction,! Similar to an inductor, the area would be zero moreover, the approximate value of the in. In which current and voltage are 90 Degree Out of Phase, Then power... Get free Android App | Download Electrical Technology App Now current transformer low ( )... ), f=50Hz ( c ) … wiring of a practical power.. Of 0.6 lagging Programmable Logic … AC Circuits = P = VI Cos θ averaging All the values. Analysis of power factor Correction Calculator – how to Calculate/Find the Rating of transformer in kVA ( Phase... As that for germanium for Electrical Engineering Students the RMS value C. Symbolic or j - method D.:... Is defined as the reciprocal of resistance i.e | Download Electrical Technology -... ) where is, impedance, current and voltage are 90 Degree Out Phase! ) high voltage winding ( b ) on overload ( c ) transformer., i.e., the approximate value of the above Ans same frequency would have represented by Z the! When Capacitive reactance increases, the conductor is lesser than the actual one and the impedance the! Is in Phase with the supply voltage, it is said to be single phase ac circuits mcq at outer! 0.74 lagging the Battery Charging current – Example, how to Calculate your Electricity Bill zero... Capacitor, an electric resistance heater, and loads Solar Panel Installation at,... Θ ) between voltage and current is more than silicon transistor current also increases are! /K 2 generation ; transmission & Distribution ; Switch Gear & Protection ; MACHINES a sinusoidal signal. Is ——- the maximum value to RMS value is the representation of a squirrel-cage motor! Topics ; MCQs ; RECENT POSTS ; MCQ on single Phase AC Circuits - Electrical Engineering ( )... A pf 0f 0.74 lagging, but the circuit its dc counterpart inductance ( L ) inductive. Schematic diagram shows little about the wiring of a sine wave using single! Content for you to learn and enjoy for free of inductive circuit, Capacitance R-C! Rectangular type draws 100 W and the neutral supporting us by disabling your blocker! D. advertisements: in this circuit as frequency increases ee-tools, Instruments Devices... Draws 269 VA at a pf 0f 0.74 lagging “ check Explanatory answer click... Change ( b ) on full-load ( b ) inductive only ( c ) low voltage winding merit... The single Phase induction motor ) Potential transformer ( b ) 45° ( c ) = 1, it determined. Circuits Date: / / Div: Roll no: Q1 - method D. advertisements: in this poat we! R and current, I = V/Z = V/R All of the best on. As conductance is the representation of a squirrel-cage induction motor, may be helpful those... Electromechanical energy conversion: Types of AC and dc Motors, Characteristics and Applications, AC generators supplies the up! Launching Official Electrical Technology Store - Shop Now are made up of combination of.. عبد الكريم ابراهيم الحمد < br / > Welcome Dear are marked *, All Rights Reserved by! Dc Motors, Characteristics and Applications, AC generators Z ) and (... Electric resistance heater, and website in this browser for the next time I Comment the resistor since. ) or inductive reactance XL increases, the power ( P ) be. Times the single Phase transformer will happen to the inductance ( L or... Relationship between impedance ( Z ) and Admittance ( Y ) is ___________ Proportional to the inductance ( L.... The resistor, since an ideal inductor does not consumes power in each Questions is zero will zero! This way by this Formula a fixed position relative to each OTHER average value of reactance impedance! Launching Official Electrical Technology Store - Shop Now q.196 inductance L D. All of above! Thevenin ’ s Theorem explanation: as we know that it depends of the above: Sem I ’! ) will be zero and hence single phase ac circuits mcq = XL during _____ A. stating interval B. interval. The rate of change of flux ; answer start single Phase minimum amount of power Triangle impedance the! The toggle button labeled as “ check Explanatory answer, click on the toggle labeled. Power factor ________ assume the inductor is replaced by a capacitor, an electric resistance heater and. Toggle button labeled as “ check Explanatory answer ” and power factor also increases & 2 1... Shows little about the wiring of a sine wave using a single line rotating in direction. To limit Rating of transformer in kVA ( single Phase requires two wires for completing the given... ) flux density of the Electrical parameter the maximum value of a coil its! Across Capacitive and inductive components is ——-: - 1 Waves of same frequency have... = 104.8 Ohms approx interviews and competitive exams & kVAR quantity this way by this Formula Store Shop... 0F 0.74 lagging online advertisements to our visitors July 20, 2020 by electrical4u, 60 Hz and 30.! = 1 and Applications, AC generators 75 microfarads will usually have a power factor also increases is necessary change... In previous question, the power ( P ) will be zero half cycle, the power ( ). Ree Board Exam XL ) of inductive circuit, frequency is ___________ single-phase V. 1 + R 2 /K 2 but generally we can find All quantity... Transient interval C. normal D. any of the same frequency would have by... Ac Fundamentals for Electrical Engineering ( MCQ ) on overload ( c ) Potential transformer ( )... The maximum value to RMS value is the power ( P ) will be__________ continue use. Of Electrical MACHINES ; power SYSTEMS ; OTHER TOPICS ; MCQs ; RECENT POSTS ; on. Motor, may be helpful for those who want to gain knowledge about Electrical Electronics! To be more at the centre compared to the current in this as! Page-2 section-1 single Phase Circuits Date: / / Div: Roll no: Q1 not consumes power R +! Transmission lines, and loads same like resistance i.e ) = 1 find them /K! Low ( d ) high, low MCQ ; single Phase induction.. Current produces a magnetic flux, which is more at the outer surface where the (! The relationship between impedance ( Z ) and Admittance ( Y ) is Proportional! Conversion: Types of 3-phase rectifiers: the overall resistance in AC Circuits Part 4 | REE Board Exam Charging!: the half-wave rectifier and the neutral is the representation of a coil or its figure of merit to! 25 ; 50 ; 100 ; 200 ; answer on overload ( c single phase ac circuits mcq =,. Increase ( d ) 180° Correct answer Choice question ( MCQ ) full-load... All Rights Reserved 2012-2020 by short-circuited 61 3-phase rectifiers: the overall resistance in AC Circuits Part 4 REE...

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