electrical engineering MCQs – Page 16

Practise multiple-choice questions from electrical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

electrical engineering Mcqs
1. economics of power generation2. analog electronics3. solid state switching circuits4. parallel circuits5. switchgear and protection6. op amp circuits7. transistor audio power amplifiers8. electrostatics9. heating and welding10. multi stage transistor amplifiers11. passive filters12. network theorems13. regulated d c power supply14. a c fundamentals circuits and circuit theory15. electromagnetic induction16. power electronics17. magnetism and electromagnetism18. transformers19. modulation and demodulation20. d c generators21. semiconductor theory22. single phase induction motors23. semiconductor diode24. hybrid parameters25. digital electronics26. oscillators27. earthing or grounding28. single stage transistor amplifiers29. d c motors30. transistor biasing31. amplifiers with negative feedback32. basic electrical33. electronic instruments34. synchronous motors35. field effect transistors fet36. magnetic circuit37. control systems38. industrial drives39. power generation40. series parallel circuits41. transistor tuned amplifiers42. electrical engineering materials43. rectifiers and converters44. integrated circuits45. scr silicon controlled rectifiers46. cables47. polyphase induction motors48. measurement and instrumentation49. transistors50. electrical machine design51. electrolysis and storage of batteries52. electric traction53. transmission and distribution
301. With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals_____________?
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A. 20 W

B. 10 W

C. 60 W

D. 40 W

302. Star/star transformers work satisfactorily when________________?
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A. load is balanced only

B. none of the above

C. load is unbalanced only

D. on balanced as well as unbalanced loads

303. Power transformers are designed to have maximum efficiency at___________?
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A. 50% full load

B. no load

C. nearly full load

D. 70% full load

304. The leakage flux in a transformer depends upon______________?
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A. load current, voltage and frequency

B. load current

C. load current and voltage

D. load current, voltage, frequency and power factor

305. A step down choppers can be used in___________?
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A. All of these

B. Machine tools

C. Electric traction

D. Electric vehicles

306. Electric pressure is also called________?
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A. power

B. voltage

C. resistance

D. energy

307. Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners ___________?
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A. 3/2 Q

B. 6 Q

C. 8/3 Q

D. 4 Q
308. In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is
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A. 132 V

B. 80 V

C. 66 v

D. 33 V

309. With rise in temperature the resistance of pure metals______________?
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A. remains constant

B. decreases

C. increases

D. first increases and then decreases

310. Out of the following which is not a poor conductor__________?
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A. Copper

B. Cast iron

C. Carbon

D. Tungsten

311. If energy is taken from the AC side of the inverter and sends it back into the DC side, then it is known as___________?
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A. None of these

B. Regenerative mode operation

C. Motoring mode operation

D. Braking mode operation

312. In a flyback converter, the inductor of the buck-boost converter has been replaced by a_____________?
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A. Flyback transformer

B. Flyback transistor

C. Flyback resistor

D. Flyback capacitor

313. If the efficiency of a machine is to be high, what should be low __________?
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A. True component of power

B. Losses

C. Ratio of output to input

D. kWh consumed

E. Input power

314. The thickness of laminations used in a transformer is usually____________?
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A. 14 mm to 15 mm

B. 4 mm to 5 mm

C. 25 mm to 40 mm

D. 0.4 mm to 0.5 mm
315. Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes__________?
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A. unchanged

B. 9 times

C. 1/9 times

D. 3 times

316. In the transformer following winding has got more cross-sectional area______________?
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A. Low voltage winding

B. Primary winding

C. High voltage winding

D. Secondary winding

317. Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 25 Q. If the same four wires are connected is series the effective resistance will be________?
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A. 300 ?

B. 200 ?

C. 400 ?

D. 100 ?

318. Efficiency of a power transformer is of the order of________________?
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A. 100 per cent

B. 98 per cent

C. 25 per cent

D. 50 per cent

319. The input current waveform of a bridge controlled rectifier when the load is perfectly filtered is___________?
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A. Sine wave

B. Square wave

C. Saw tooth wave

D. Trapezoidal wave

320. Iron loss of a transformer can be measured by____________?
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A. frequency meter

B. any type of wattmeter

C. low power factor wattmeter

D. unity power factor wattmeter