electrical engineering MCQs – Page 312

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 Review each marked answer and report any item that may be outdated or unclear.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
6221. technique gives quick transient and stability response______________?
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A. Bode

B. Nichols

C. Root locus

D. Nyquist

6222. The band width, in a feedback amplifier_______________?
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A. decreases by the same amount as the gain decrease

B. decreases by the same amount as the gain increase

C. remains unaffected

D. increases by the sane saaaajajt as the gain decrease
6223. The diameter of the rotor shaft for an electric motor depends on which of the following ?
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A. Horse power only

B. Horse power and r.p.m.

C. Horse power, r.p.m. and power factor

D. r.p.m. only

6224. While selecting motor for an air conditioner which of the following characteristics is of great importance ?
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A. None of the above

B. Type of bearings

C. Type of enclosure

D. Arrangement for power transmission

E. Noise
6225. The starting torque of a D.C. motor is independent of which of the following?
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A. Flux

B. Armature current

C. Speed

D. Flux and armature current

6226. A reluctance motor_________________?
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A. requires starting gear

B. is provided with slip rings

C. is compact

D. has high cost

6227. ___________________has least range of speed control?
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A. D.C. shunt motor

B. Schrage motor

C. Slip ring induction motor

D. Synchronous motor
6228. Battery operated scooter for braking uses________________?
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A. plugging

B. mechanical braking

C. regenerative braking

D. rheostatic braking

6229. The cost of an induction motor will increase as________________?
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A. horsepower rating decreases but r.p.m. increases

B. horsepower rating and operating speed increases

C. horsepower rating increases but r.p.m. decreases

D. horsepower rating and operating speed decreases

6230. For a D.C. shunt motor which of the following is incorrect ?
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A. Torque varies as armature current

B. Unsuitable for heavy duty starting

C. Torque is zero for zero armature current

D. Torque-armature current is a straight line

6231. Belted slip ring induction motor is almost invariably used for_________________?
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A. jaw crushers

B. centrifugal blowers

C. water pumps

D. none of the above

6232. In case of _______________ speed control by injecting e.m.f. in the rotor circuit is possible?
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A. d.c. shunt motor

B. slip ring induction motor

C. schrage motor

D. synchronous motor

6233. The starting torque in case of centrifugal pumps is generally_________________?
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A. less than running torque

B. slightly more than running torque

C. same as running torque

D. double the running torque

6234. Which of the following motors has series characteristics ?
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A. Capacitor start motor

B. None of the above

C. Repulsion motor

D. Shaded pole motor

6235. Which of the following motors is used for elevators ?
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A. Synchronous motor

B. Any of the above

C. Induction motor

D. Capacitor start single phase motor

6236. The characteristics of drive for crane hoisting and lowering are which of the following ?
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A. Precise control

B. All of the above

C. Fast speed control

D. Smooth movement

6237. The capacity of a crane is expressed in terms of_______________?
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A. any of the above

B. type of drive

C. span

D. tonnes
6238. Heat control switches are used in__________________?
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A. three phase induction motors

B. cooling ranges

C. single phase

D. transformers

6239. ________________ motor is a constant speed motor?
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A. Schrage motor

B. Universal motor

C. Induction motor

D. Synchronous motor
6240. In squirrel cage induction motors which of the following methods of starting cannot be used ?
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A. Resistance in rotor circuit

B. Star-delta starting

C. Resistance in stator circuit

D. Auto-transformer starting