As the stator generates a rotating magnetic field around the rotor, the rotor rotates. Just select your click then download button, and complete an offer to start downloading the ebook. Ans: a, 20. (b) 30 Hz Ans: d, 102. In particular, if a coil rotates in the presence of a magnetic field, the induced emf varies sinusoidally with time and leads to an alternating current (AC), and provides a source of AC power. (e) r.m.s. (b) transformers (d) The current through any one element is less than the source current (d) 42.42 sin 314 t For a frequency of 200 Hz, the time period will be (d) unity Ans: a, 15. (a) changes in the stored energy in the inductors and capacitors (6) time required to complete one cycle Ans: b, 27. (a) low A simple loop in a uniform magnetic field - The voltage induced in a simple rotating loop - The Torque induced in a current-carrying loop 2. (a) true power (6) r.m.s. (b) 0.08 lagging (b) increases with the increase of inductance and the increase of resistance (c) applied voltage to the circuit The time constant of a series R-C circuit is given by, 16. In each of the three coils of a three phase generator, an alternating voltage having an … (a) 0.05 s Two waves of the same frequency have opposite phase when the phase angle between them is (d) none of the above value ? (a) will change the maximum value of current at resonance (6) will change the resonance frequency In a series resonant circuit, the impedance of the circuit is (c) r.m.s. (d) the current can lead or lag by 90° Fleming's Right Hand Rule indicates the direction of induced current (for generators) when a conductor is passed through lines of magnetic flux. (a) mean value (c) actual power is more than reactive power (b) A coil with low resistance (d) capacitance (b) Capacitance Output shaft available in round shaft type and pinion shaft type. (b) square wave (d) form An N pole and an S pole are generated in the magnetic pole of the auxiliary winding. (d) increases with decrease of inductance and increase of resistance Capacitive reactance is more when AC/DC Fundamentals This five-day course begins with a fundamental review of conductors and insulators, electric current, resistance, Ohm’s and Kirchhoff’s Laws, electrical power, and magnetism. (d) half wave rectified sine wave (c) power (c) 282.8 V (a) 2.5 (b) high power factor (d) square wave Ans: c, 34. Form Factor is the ratio of The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. 53. 2. (c) at the time of turning on and off Ans: b, 103. In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. (d) both applied voltage and current decrease WHAT IS ALTERNATING CURRENT (A.C.)? Ans: c, 94. The best place to install a capacitor is (c) kW/kVA (a) R/Z (b) low voltage across the load (b) exchange of power takes place between inductor and supply line Ans: a, 74. Ans: c, 67. Ans: b, 97. (b) 0.707 of peak value (c) current can lead or lag the voltage by 90° (c) connecting them in parallel in¬creases the total value Write the general equation for a sinusoidal signal based on its amplitude, frequency, and phase shift. (b) load Capacitors for power factor correction are rated in ° (c) 15 mA Which of the following values is indicated by the voltmeters ? The safest value of current the human body can carry for more than 3 second is, 17. (d) all above The metal used in the shaft is S45C. (a) the capacitive reactance in ohms (b) low If we hook up an oscilloscope to a circuit with AC and plot its voltage over time, we might see a number of different waveforms. (b) unity value of full wave rectified AC. (d) average value The underground system cannot be oper... ElectricalNotes4u is a Blog for Electrical Engineering Students who want to learn Electrical Engineering online. All Rights Reserved. (b) true power (b) kVA In a highly capacitive circuit the Ans: a, 22. This consumption can be attributed to Inductance affects the direct current flow, 8. 7. (b) directly as square of number of turns In any A.C. circuit always They are easy to handle and have features that can be configured at a low cost. (a) 20 Hz (c) sinusoidal (c) depends upon the magnitude of C Download PDF. (b) increases with the increase of inductance and the increase of resistance Ans: a, 104. (c) 111 V (d) frequency value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces Ans: c, 52. Ans: c, 10. (c) 220/V3 V (b) are likely to melt under excessive eddy current heat (a) average value/r.m.s. Ans: a, 46. In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will Ans: a, 55. (d) none of the above Pure inductive circuit (a) between 0° and 90° Ans: c, 75. Multiple Choice Questions (MCQ) on AC Fundamentals for Electrical Engineering. Inductance of coil (b) reactive power is more than the apparent power Ans: d, 38. Page 3 of 12. Ans: c, 31. In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value The phosphors for which of the following pair are 180° out of phase for VL, VC and VR? (c) capacitance only Ans: b, 69. For the same peak value, which of the following wave has the least mean value ? The square waveform of current has following relation between r.m.s. Copyright 2020 , Engineering Interview, A.C. Ans: a, 72. The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of (a) falls to 36.8% of its final steady value (c) 30 sin 50 t (a) 180″ Multiple Choice Questions (MCQ) on Transmission and Distribution for Electrical Engineering 1. (c) make assembly cheap and easier (a) the more heat than produced by A.C. when flowing through the same circuit 12.1 AC Sources In Chapter 10 we learned that changing magnetic flux can induce an emf according to Faraday’s law of induction. Hz (c) takes power from the line during some part of the cycle and then returns back to it during other part of the cycle (a) inductive reactance (d) current is in phase with the voltage Ohm is unit of all of the following except (b) Sine wave All definitions of power factor of a series R-L-C circuit are correct except Ans: c, 37. Power factor of an electrical circuit is equal to (c) kV cm, Speed: Ans: a, 25. (c) overloads alternators, transformers and distribution lines (a) triangular wave (d) 0.637 Motor case made from die cast aluminum with a machined finish inside, 4. value of half wave rectified sine wave is 200 V. The r.m.s. (d) none of the above Provide the reader with a case study on the design and optimisation of an air-conditioning (A/C) system. (a) 0.5 of peak value (d) not a sinusoid At ______ frequencies the parallel R-L circuit behaves as purely resistive. If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be

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