electrical engineering MCQs – Page 13

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 Review each marked answer and report any item that may be outdated or unclear.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 generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

241. 74. Sparking occurs when a load is switched off because the circuit has high_________?
0

A. resistance

B. inductance

C. impedance

D. capacitance

242. The hot resistance of the bulbs filament is higher than its cold resistance because the temperature co-efficient of the filament is___________________?
0

A. zero

B. positive

C. negative

D. about 2 ohms per degree

243. In the transformer the function of a conservator is to_______________?
0

A. protect the transformer from damage when oil expends due to heating

B. none of the above

C. supply cooling oil to transformer in time of need

D. provide fresh air for cooling the transformer

244. A Buchholz relay can be installed on______________?
0

A. auto-transformers

B. welding transformers

C. uchholz relay can be installed on

D. air-cooled transformers

E. oil cooled transformers

245. Spacers are provided between adjacent coils?
0

A. to provide free passage to the cooling oil

B. to insulate the coils from each other

C. both A. and (b)

D. none of the above

246. The purpose of providing iron core in a step-up transformer is?
0

A. to increase the magnitude of mutual flux

B. to provide coupling between primary and secondary

C. to provide all above features

D. to decrease the magnitude of mag-netizing current

247. Hysteresis loss in a transformer varies as CBmax = maximum flux density) ?
0

A. Bmax1-83

B. Bmax1-6

C. B max

D. Bmax

248. Delta/star transformer works satisfactorily when______________?
0

A. load is unbalanced only

B. load is balanced only

C. none of the above

D. on balanced as well as unbalanced loads

249. Which type of winding is used in 3 phase shell-type transformer?
0

A. Cylindrical type

B. Circular type

C. Rectangular type

D. Sandwich type

250. 1 angstrom is equal to______________?
0

A. 10-8 mm

B. 10?10 m

C. 10?6 cm

D. 10~14 m

251. Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in____________?
0

A. transformers having higher copper losses will have negligible core losses

B. short-circuiting of the secondaries

C. loading of the transformers not in proportion to their kVA ratings

D. power factor of one of the transformers is leading while that of the other lagging

252. An instrument which detects electric current is known as_____________?
0

A. wattmeter

B. voltmeter

C. galvanometer

D. rheostat

253. If R2 is the resistance of secondary winding of the transformer and K is the transformation ratio then the equivalent secondary resistance referred to primary will be___________?
0

A. R2IK2

B. R22/K

C. R2/VK

D. R22!K2

254. Primary winding of a transformer________________?
0

A. none of the above

B. could either be a low voltage or high voltage winding

C. is always a low voltage winding

D. is always a high voltage winding

255. Regulator sampling PWM is usually used in___________?
0

A. High power inverters

B. Rectifiers

C. Only A. and B.

D. Low power inverters

256. Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct ?
0

A. 100 W lamp will glow brighter

B. 40 W lamp will glow brighter

C. Both lamps will glow equally bright

D. 40 W lamp will fuse

257. Conductance : mho :: ____________?
0

A. lumen : steradian

B. resistance : ohm

C. capacitance : henry

D. inductance : farad

258. The insulation on a current carrying conductor is provided__________?
0

A. to prevent leakage of current

B. to prevent shock

C. both of above factors

D. none of above factors

259. The IGBT resulted in higher switching speed and lower energy losses. It can be used for___________?
0

A. Uninterruptible power supplies

B. Constant voltage and frequency power supplies

C. All of these

D. Induction heating system

260. A thermistor has_____________?
0

A. positive temperature coefficient

B. negative temperature coefficient

C. zero temperature coefficient

D. variable temperature coefficient

Previous Next

Showing 241 to 260 of 7381 mcqs