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Electrical Engineering Objective Questions MCQ For Graduate Engineers Fully Solved Electrical Engineering objective questions MCQ for graduate Engineers Fully Solved1.If the applied voltage of a certain transformer is increased hr 50% and the frequency is reduced to 50% (assuming that the magnetic circuit remains unsaturated), the maximum core flax density will 2. The low—voltage winding of a core type transformer is subdivided into two equal halves, each of half the original width of the single winding will the high voltage winding in between (instead of having the usual construction of low-voltage winding adjacent to the core and surrounded by the high-voltage winding). Such an interlacing of coils would make the combined primary and secondary leakage reactance (in terms of primary) nearly. 3. Two 3-limb, 3-phase delta-star connected transformers are supplied from the same source. One of the transformers is of. Dy I and the other is of Dy II / connection. The phase difference between the corresponding phase voltages of the secondaries would he 4. In a transformer fed from a fundamental frequency voltage source, the source of harmonics k the 5. A 40 kVA transformer/ a core loss of400 W and a full load copper of of 800 W. The proportion of full-load at maximum efficiency is 6.A single phase transformer has rating of 15 KVA 600 / 120 V. It is recommended as an auto transformer to supply at 720 V from a 600 V primary source. The maximum load it can supply is ? 7. Equalizing pulses in TV are placed during the 8. The most useful approach to radar system for monitoring the speed of moving vehicles is: 9. A. dc shunt generator, when driven at its rated speed, is found to he not generating any voltage. Which of the following would account for this? 10. To have spark/as commutation, the armature reaction effect in a dc machine is neutralised by 11.In a dc shunt general or working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will 12. Consider the following statements: 13. Consider the following statements about broadband communication using submarine cables: 14. A dc overcompounded generator was operating satisfactorily and supplying power to an infinite bus when the prime mover failed to supply any mechanical power. The machine would then run as a ? 15 To couple a coaxial line to a parallel wire line, It is best to use a 16. When a synchronous motor is running at synchronous speed, the damper winding produces 17. For a given developed power, a synchronous motor operating from a constant voltage and constant frequency supply, will draw the minimum and maximum armature currents, Imin and Imax respectively, corresponding to? 18. Consider the folio wing statements regarding an RC phase-shift oscillator: 19 While conducting a “slip “ test for determination of direct and quadrature axis synchronous reactance ‘Xd’ and ‘Xq’ of salient pole synchronous machine, the rotor of the machine is run with a slip ‘s’ and stator supply frequency ‘f’. The frequency of 20. If two induction motors A and B are identical except that the air-gap of motor ‘A ‘ is 59% greater than that of motor ‘B’, then 21 A 6-pole, 50 Hz, 3-phase synchronous motor and an 8-pole, 50 Hz. 3—phase slipring induction motor are mechanically coupled and operate on the some 3-phase, 50 Hz supply system If they are left open-circuited, then the frequency of the voltage produced across any two slip rings would be? 22. Which of the following statements regarding skewing of motor bars in a squirrel-cage induction motor are correct? 23. The rotor power output of a 3-phase induction motor is 15kW and the corresponding slip is 4%. The rotor copper loss will be 24. If an input signal with non-zero dc component is applied to a low pass RC network, the dc component in the output will be ? 25. A 3 phase wound rotor induction motor, when started with load connected to its shaft, was found to start but settle down at about half synchronous speed. If the rotor winding as well as the stator winding were star connected, then the cause of the malfunction could be attributed to 26. Consider the following statements regarding fractional horse power shaded-pole motor: 27. In the case of a converter-inverter speed control arrangement f an induction motor operating with v/f constant and with negligible stator impedance. 28 An amplifier with mid-band gain A = 500 has negative feedback beta = 1/100 the upper cut-off without feedback were at 60 kHz, then with feedback it would become 29. If the discharge is 1 m cube and the head of water is 1 m then the power generated by the alternator in one hour (assume 100% efficiency of generator and turbine) will be 30. Control rods used In unclear reactors are made of 31. if alpha = 0.98, Ico=6 microA I beta =100 microA for a transistor, Then the value of Ic will he 32. In a 3-core extra-high voltage cable, a metallic screen around each core-insulation is provided to 33. Galloping In transmission line conductors arises generally due to 34.. In a 3- phase rectifier circuit, thyristor number 1, 2 and 3 are connected respectively to R, Y and B phases of the star-connected transformer secondary. When the current is being commutated front thyristor No. 1 to No. 2, the effect of the transformer leakage and the ac system Inductance will be such that it will? (a) Prolong the conduction in No. 1 and delay the turn on of No. 2 correspondingly. 35. The incremental generating costs of two generating units are given by 36. Consider the following statements: 37. The reflection coefficient of a short-circuited line is 38.Iif an intrinsic semiconductors is doped with a very small amount of born then in the extrinsic semiconductor so farmed, the number of electrons and holes will 39. Hollow conductors are used in transmission lines to 40. In the solution of load-flow equation, Newton-Raphson (NR) method is superior to the Gauss- Seidel (GS) method, because the 41. In a synchronous generator, a divided winding rotor is preferable to a conventional winding rotor because of 42. Consider the following statements regarding speed control of induction motors by means of external rotor resistors: 43. Zero sequence currents can flow from a line into a transformer bank if the windings are in ? 44. When a line to ground fault occurs, the current in a faulted phase is 100 A. The Zero Sequence current in this case will be 45. Consider the following statements: 1. suitable for use in both ac and dc. 46. The power generated by two plants are P1 = 50MW, P2= 40 MW. 47. In dc choppers, per unit ripple is maximum when then duty cycle is? 48. The following data pertain to two alternators working in parallel and supplying a total load of 80 MW: 49. The per unit impedance of a synchronous machine is 0.242. If the base voltage is Increased by 1.1 times, the per unit value will be 50. A 3-pulse converter feeds a pure resistive load at a firing angle of alpha = 60°. The average value of current flowing in the load is 10 A, If a very large inductance is connected in the load circuit, then the Answers
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