electrical engineering MCQs – Page 59

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 Review each marked answer and report any item that may be outdated or unclear.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

1161. In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will_____________?
0

A. fall out of synchronism and come to stand still

B. draw excessive armature current and may burn out

C. become unstable

D. run as induction motor

1162. When the equivalent circuit diagram of doouble squirrel-cage induction motor is constructed the two cages can be considered__________?
0

A. in parallel with stator

B. in parallel

C. in series

D. in series-parallel

1163. Star-delta starting of motors is not possible in case of____________?
0

A. low horse power motors

B. high speed motors

C. variable speed motors

D. single phase motors

1164. An induction motor with 1000 r.p.m. speed will have____________?
0

A. 6 poles

B. 4 poles

C. 8 poles

D. 2 poles

1165. The power factor of a single-phase induction motor is usually?
0

A. unity

B. lagging

C. unity to 0.8 leading

D. always leading

1166. The cogging of an induction motor can be avoided by____________?
0

A. proper ventilation

B. using DOL starter

C. auto-transformer starter

D. having number of rotor slots more or less than the number of stator slots (not equal)

1167. Which of the following applications always have some load whenever switched on ?
0

A. Fan motors

B. Pistol drills

C. All of the above

D. Vacuum cleaners

1168. A synchronous motor connected to infinite bus-bars has at constant full load, 100% excitation and unity power factor. On changing the excitation only, the armature current will have_____________?
0

A. leading power factor with under-excitation

B. lagging power factor with over-excitation

C. no change of power factor

D. leading power factor with over-excitation

1169. A.C. series motor as compared to D.C. series motor has__________?
0

A. more number of armature turns

B. less air gap

C. less number of field turns

D. all of the above

E. smaller brush width

1170. Which of the following motors has highest starting torque ?
0

A. Capacitor-start motor

B. Split-phase motor

C. Shaped pole motor

D. Repulsion motor

1171. An over-excited synchronous motor takes__________?
0

A. leading current

B. lagging current

C. both A. and (b)

D. none of the above

1172. In a three-phase induction motor, the number of poles in the rotor winding is always__________?
0

A. more than the number of poles in stator

B. zero

C. less than number of poles in stator

D. equal to number of poles in stator

1173. The effect of increasing the load on a synchronous motor running with normal excitation is to___________?
0

A. decrease both armature current and power factor

B. decrease armature current but increase power factor

C. increase armature current but decrease power factor

D. increase both its armature current and power factor

1174. Single phase induction motor usually operates on__________?
0

A. 0.8 power factor lagging

B. 0.6 power factor lagging

C. unity power factor

D. 0.8 power factor leading

1175. The efficiency of an induction motor can be expected to be nearly____________?
0

A. 99%

B. 60 to 90%

C. 80 to 90%

D. 95 to 98%

1176. In the squirrel-cage induction motor the rotor slots are usually given slight skew__________?
0

A. to increase the tensile strength of the rotor bars

B. none of the above

C. to ensure easy fabrication

D. to reduce the magnetic hum and locking tendency of the rotor

1177. Which of the following statements regarding single-phase induction motors correct?
0

A. It can rotate in one direction only

B. It is self-starting

C. It is not self-starting

D. It requires only one winding

1178. The speed of a universal motor is usually reduced by using____________?
0

A. chains

B. belts

C. brakes

D. gearing

1179. The mechanical displacement of the rotor with respect to the stator, in polyphase multipolar synchronous motors running at full load, is of the order of_____________?
0

A. two degrees

B. five degrees

C. zero degree

D. ten degrees

1180. The crawling in the induction motor is caused by____________?
0

A. high loads

B. improper design of the machine

C. low voltage supply

D. none of the above

E. harmonics develped in the motor

Previous Next

Showing 1161 to 1180 of 7381 mcqs