electrical engineering MCQs – Page 60

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 Review each marked answer and report any item that may be outdated or unclear.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
1181. When /?2 is the rotor resistance, .X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running conditions will be_____________?
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A. R2 = s2X2

B. R2 = sX2

C. sR2 = X2

D. sR2X2 = 1

1182. A shaded pole motor does not possess___________?
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A. capacitor

B. all of the above

C. commutator

D. centrifugal switch

1183. Which of the following motors is non-self starting ?
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A. Squirrel cage induction motor

B. Wound round induction motor

C. D.C. series motor

D. synchronous motor
1184. Speed torque characteristic of a repulsion induction motor is similar to that of a D.C____________?
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A. compound motor

B. separately excited motor

C. shunt motor

D. series motor

1185. Which type of bearing is provided in small induction motors to support the rotor shaft ?
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A. Cast iron bearings

B. Bush bearings

C. None of the above

D. Ball bearings
1186. The direction of rotation of an hysteresis motor is determined by____________?
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A. position of shaded pole with respect to main pole

B. none of these

C. interchanging the supply leads

D. retentivity of the rotor material

1187. Which motor is preferred for use in mines where explosive gases exist ?
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A. Synchronous motor

B. D.C. shunt motor

C. Air motor

D. Induction motor

1188. Which of the following motors is used in mixies ?
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A. Hysteresis motor

B. Repulsion motor

C. Reluctance motor

D. Universal motor
1189. After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on ______________?
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A. compensating winding

B. field winding

C. running winding

D. rotor winding

1190. In case the air gap in an induction motor is increased____________?
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A. the power factor will decrease

B. speed of motor will increase

C. the magnetising current of the rotor will decrease

D. the windage losses will increase

1191. Hunting in a synchronous motor cannot be due to___________?
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A. variable frequency

B. variable supply voltage

C. windage friction

D. variable load

1192. The power developed by a synchronous motor will be maximum when the load angle is____________?
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A. 45

B. 120

C. zero

D. 90
1193. Riunting in a synchronous motor takes place___________?
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A. when load varies

B. when supply voltage fluctuates

C. motor is under loaded

D. when power factor is unity

1194. Which of the following plants is almost inevitably used as base load plant?
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A. Pumped storage plant

B. Gas turbine plant

C. Diesel engine plant

D. Nuclear power plant
1195. The torque angle, in a synchronous motor, is the angle between_______________?
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A. none of the above

B. the supply voltage and the back e.m.f.

C. the rotating stator flux and rotor poles

D. magnetising current and back e.m.f.

1196. Which of the following, in a thermal power plant, is not a fixed cost?
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A. Fuel cost

B. Depreciation

C. Insurance charges

D. Interest on capital

1197. Which of the following generating station has minimum running cost ?
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A. Diesel

B. Nuclear

C. Thermal

D. Hydro
1198. If the field of a synchronous motor is underexcited, the power factor will be_____________?
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A. lagging

B. zero

C. unity

D. leading

1199. ___________ will offer the least load.
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A. Hair dryer

B. Electric shaver

C. Television

D. Vacuum cleaner

1200. A capacitor is generally a____________?
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A. bilateral and active component

B. non-linear and active component

C. linear and bilateral component

D. active, passive, linear and nonlinear component