Leave a Comment Cancel reply. (a) Primary winding (b) Secondary winding (c) Low voltage winding (d) High voltage winding. Latest Single Phase Induction Motors Questions and Answers List 1. 20. which will improve your skill. The phase difference between voltage and current wave through a circuit element is given as 30°. None of The Above; Show Explanatory Answer . Power Factor Correction Calculator – How to Find P.F Capacitor in µF & kVAR? These are 75.48 ohms and 57.44 ohms respectively. Phasor Diagram is the representation of a sine wave using a single line rotating in counter-clockwise direction with a constant velocity. EE Board Exam April 1990. 2. Answer.2. 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 In case of Inductive circuit, Frequency is ___________Proportional to the inductance (L) or inductive reactance (XL). But, when Circuit inductance increased from 0.02H to 0.04 H, then current decreased from13.70 A to 18.64A. Most of the industry operates on 3-phase power instead of single phase. A double squirrel-cage induction motor has two rotors moving in opposite direction two parallel windings in the stator two parallel windings in the rotor two series windings in the stator 2. In inductive circuit, when Inductance (L) or inductive reactance (XL) increases, the circuit current decreases, but the circuit power factor ________? ⇐ MCQ in AC Circuits Part 7 | REE Board Exam . 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. Answer:     2. plz provide the answers of MCQs……I cant find them. Tag: single phase ac circuits mcq. When it is necessary to change ac voltage to dc voltage, it is generally done with Phase rectifiers. Generation; Transmission & Distribution; Switch Gear & Protection; Machines. Projects. Step by Step Procedure with Solved Example. PARALLEL CIRCUITS. In inductive circuit, when inductive reactance XL increases, the circuit current decreases, and Vice Virsa. 4. Answer:      4. The capacitors used in single-phase capacitor motors have no Choose the letter of the best answer in each questions. Single phase power system schematic diagram shows little about the wiring of a practical power circuit. (a) frequency (b) frequency and area of the core (c) flux density of the core material. Since current is in phase with supply voltage, the total phase difference would be zero and hence XC = XL. Set 03. Ans: a. 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. (a) not change (b) decrease (c) increase (d) any of the above. Answer:          5. ⇐ MCQ in AC Circuits Part 7 | REE Board Exam . For the circuit given below, the approximate value of reactance, impedance, current and power factor is———-respectively. For a series RLC circuit at resonance, the voltage drop across capacitive and inductive components is ——-. 1. c) The saturation voltage V CE for silicon transistor is same as that for germanium. Single Phase A. C. Circuits. 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. Reading should be taken as it is b. Basic Principles of Electrical Machines; ... MCQ; Programmable Logic … in the world is in the form of three-phase AC circuits. 2. 1. What is the inductance of the coil? Electric Bill Calculator with Examples, How to Find The Suitable Size of Cable & Wire for Electrical Wiring Installation? For explanatory answer, click on the toggle button labeled as “check explanatory answer”. P Single Phase Induction Motors (Polyphase Transformers And Rotating AC Machines). Electromechanical energy conversion: Types of ac and dc motors, Characteristics and applications, ac generators. Main Menu. So in single phase minimum amount of power can be transported. In case of Inductive circuit,  inductance (L) is ___________Proportional to the  inductive reactance (XL). Resistance R B. Capacitance C C. Inductance L D. All of the above Ans. i.e ….. Xc ∞ 1/f Puttint (2) into (1) I = V/ (1/2πfC)…i.e ..I = V x 2πfC. Theangle θ  between Voltage and Current is Zero Explanation: We know that Power factor = Cos θ  Given value of Power factor is = 1. 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. 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? 23. In case of Inductive Circuit (*XL = Inductive Reactance), Impedance = Z =√ ( R2+XC2) … in Case if Capacitive Circuit (*Xc = Capacitive Reactance). This causes inductance to be more at the centre than at the surface. If the capacitor of a single-phase motor is short-circuited Hence it is zero for a full cycle. 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. The average value of a sinusoidal alternating signal is ————–. Single phase power system schematic diagram shows little about the wiring of a practical power circuit. But, this is only possible when θ = 0 ( in case of Power factor = Cos θ). 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 … In laboratory experiment, the impedance of the coil was obtained at 60 Hz and 30 Hz. Which of the following statement is true? 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. We depends on ad revenue to keep creating quality content for you to learn and enjoy for free. ADVERTISEMENTS: In this article we will discuss about:- 1. Name Email Website. 64. Since the sinusoidal wave is symmetrical, the average value in the positive cycle would be equal to the average values in the negative cycle. which will improve your skill. 13. 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. The  angle (θ) between Voltage and Current is Zero. 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. 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. then Power P = V I Cos ( 90) = 0 [ Note that Cos (90) = 0] 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? 12. (a) size of the core (b) size of the tank (c) leakage flux (d) all of the above. But, when we increased Capacitive reactance from 6 Ωto 10 Ω, then Power Factor (Cos θ) decreased from 0.85 to 0.70. Therefore Cos θ = P / V I ===> Cos θ = P (in Watts) / V I (in Volt- Ampere) ===> Cos θ = W/VI . Answer: (3)…Both 1 & 2. 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. ELECTRICAL MACHINES; POWER SYSTEMS; OTHER TOPICS; MCQs; RECENT POSTS; MCQ on Single Phase Induction Motor . Single Phase AC Circuits MCQs ( With Explanatory Answers). Impedance: The overall resistance in AC Circuit is Called Impedance. In This poat, we are going to share Multiple Choice Questions (MCQ) on AC Fundamentals for Electrical Engineering Students. (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. I.e, Cosθ = Cos (0) = 1. 351. Answer:     2. Take the Quiz and improve your overall Engineering. (a) capacitive only (b) inductive only (c) inductive or resistive (d) none of the above. Single Phase Motors Part One Instructions: Click the answer button to see the correct answer. 61. 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. (a) low power factor wattmeter (b) unity power factor wattmeter (c) frequency meter (d) any type of wattmeter. Answer            5. The total power of a three-phase AC circuit is equal to three times the single phase power. 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 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. 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. Multiple Choice Questions (MCQ) on Single Phase Motors for Electrical Engineering. 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