electrical engineering MCQs – Page 43

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 Review each marked answer and report any item that may be outdated or unclear.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

841. In case of a flat compounded generator:
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A. generated voltage is proportional to the load on the generator

B. voltage remains constant irrespective of the load

C. voltage generated is less than the rated voltage

D. speed varies in proportion to the load on the generator

842. The insulating material used between the commutator segments is normally_____________?
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A. mica

B. paper

C. insulating varnish

D. graphite

843. The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be_____________?
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A. 620 V

B. 580 V

C. 640 V

D. 600 V

844. In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to
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A. 25% of the previous value

B. 50% of the previous value

C. none of the above

D. 100% of the previous value

E. 10% of the previous value

845. If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be________________?
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A. demagnetisation only

B. cross magnetisation only

C. crossmagnetisation as well as demagnetising

D. cross magnetisation as well as magnetisation

846. Following D.C. generator will be in a position to build up without any residual magnetism in the poles______________?
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A. shunt generator

B. self-excited generator

C. series generator

D. compound generator

847. In a manual shunt motor starter?
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A. over load relay is connected in series and no volt relay in parallel with the load

B. over load relay is connected in parallel and no volt relay in series with the load

C. over load relay and no volt relay are both connected in series with the load

D. over load relay and no volt relay are both connected in parallel with the load

848. For which types of D.C. motor, dynamic braking is generally used ?
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A. Shunt motors

B. Series motors

C. All of the above

D. Compound motors

849. When two D.C. generators are running in parallel an equilizer bar is used______________?
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A. to increase the series flux

B. to increase the generated e.m.f.

C. to reduce the combined effect of ar-mature reaction of both the machines

D. so that the two identical machines will pass approximately equal currents to the load

850. If the field winding resistance of a DC shunt motor is increases, its speed will____________?
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A. increases

B. the field winding resistance of a DC shunt motor is increases, its speed will

C. none of the above

D. remains same

E. decreases

851. In a commutator_____________?
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A. copper is harder than mica

B. none of the above

C. mica and copper are equally hard

D. mica is harder than copper

852. Armature coil is short circuited by brushes when it lies_____________?
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A. in none of the above positions

B. along neutral axis

C. along field axis

D. in any of the above positions

853. Usually wide and sensitive speed control is desired in case of____________?
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A. steel rolling mills

B. centrifugal pumps

C. colliery winders

D. elevators

854. For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f___________ ?
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A. Depends on other features of design

B. Either of A. and B. above

C. Lap winding

D. Wave winding

855. Which D.C. motor is generally preferred for cranes and hoists ?
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A. Shunt motor

B. Cumulatively compounded motor

C. Differentially compounded motor

D. Series motor

856. A D.C. welding generator has____________?
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A. duplex winding

B. any of the above

C. lap winding

D. wave moving

857. A three point starter is considered suitable for______________?
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A. shunt, compound and series motors

B. all D.C. motors

C. shunt motors

D. shunt as well as compound motors

858. A D.C. generator works on the principle of____________?
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A. Faradays law of electromagnetic induction

B. Ohms law

C. Lenzs law

D. none of the above

859. Which one of the following is not the function of pole shoes in a D.C. machine ?
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A. To spread out flux for better uniformity

B. To reduce the reluctance of the magnetic path

C. To reduce eddy current loss

D. To support the field coils

860. In any rotating machine that part which houses the conductors and in which e.m.f. induced is to be utilized is called____________?
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A. stator

B. rotor

C. field

D. armature

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