electrical engineering MCQs – Page 44

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 Review each marked answer and report any item that may be outdated or unclear.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
861. In case of conductively compensated D.C. series motors, the compensating winding is provided______________?
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A. in parallel with field winding

B. in series with armature winding

C. as separately wound unit

D. in parallel with armature winding

862. In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except______________?
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A. dummy coils

B. interpoles

C. shifting of axis of brushes

D. compensating winding

863. D.C. series generator is used_________________?
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A. to supply traction load

B. for none of the above purpose

C. to supply industrial load at constant voltage

D. voltage at the toad end of the feeder
864. With the increase in temperature, the speed of DC shunt motor____________?
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A. increases

B. none of the above

C. decreases.

D. remain same

865. The condition for maximum power in case of D.C. motor is______________?
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A. supply voltage = back e.m.f

B. back e.m.f. = 2 x supply voltage

C. back e.m.f. = | x supply voltage

D. supply voltage = | x back e.m.f

866. The armature voltage control of D.C. motor provides____________?
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A. constant current drive

B. constant voltage drive

C. constant torque drive

D. none of the above

867. In which of the following device the generated emf and armature current are in the opposite directions?
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A. dc generator

B. transformer

C. dc motor

D. all of the above

868. The plugging gives the____________?
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A. highest torque braking

B. zero torque braking

C. smallest torque braking

D. none of the above

869. If a D.C. motor designed for 40C ambient temperature is to be used for 50C ambient temperature, then the motor_____________?
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A. can be used for 50C ambient temperature also

B. of lower H.P. should be selected

C. of higher H.P. should be selected

D. is to be derated by a factor recommended by manufacturer and select the next higher H.P. motor
870. Magnetic field in a D.C. generator is produced by_______________?
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A. electromagnets

B. permanent magnets

C. both A. and B.

D. none of the above

871. A direct on line starter is used: for starting motors___________?
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A. up to 10 H.P

B. up to 20 H.P

C. up to 5 H.P

D. up to 15 H.P

872. If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will_________?
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A. increase

B. decrease

C. become zero

D. remain same

873. A separately excited generator as compared to a self-excited generator_____________?
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A. is more stable

B. is amenable to better voltage control

C. has all above features

D. has exciting current independent of load current

874. Which of the following loss in a D.C. generator is dissipated in the form of heat?
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A. Copper loss

B. Mechanical loss

C. All of the above

D. Core loss

875. In D.C. generators, lap winding is used for______________?
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A. high voltage, high current

B. low voltage, low current

C. high voltage, low current

D. low voltage, high current
876. The shaft of an induction motor is made of_____________?
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A. stainless steel

B. cast iron

C. carbon steel

D. high speed steel

877. In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when____________?
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A. number of poles is 2

B. number of poles is 4

C. r.p.m. is more than 300

D. r.p.m. is less than 300

878. In a D.C. generator the ripples in the direct e.m.f. generated are reduced by_____________?
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A. using conductor of annealed copper

B. using equiliser rings

C. using carbon brushes of superior quality

D. using commutator with large number of segments

879. What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?
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A. The motor will run noisy

B. The armature may burn

C. The motor will stop

D. The motor will continue to run

880. Number of tappings for each equalizer ring is equal to_____________?
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A. number of parallel paths

B. number of commutator segments

C. number of poles

D. number of pole pairs