electrical engineering MCQs – Page 40

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 Review each marked answer and report any item that may be outdated or unclear.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
781. The field coils of D.C. generator are usually made of_____________?
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A. carbon

B. cast iron

C. mica

D. copper
782. The armature core of a D.C. generator is usually made of__________________?
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A. non-ferrous material

B. copper

C. cast-iron

D. silicon steel
783. The armature torque of the D.C. shunt motor is proportional to____________?
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A. field flux only

B. armature current only

C. both A. and B.

D. none of the above

784. Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of_____________?
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A. all of above motors

B. D.C. shunt motor

C. D.C. series motor

D. induction motor

785. In the case of lap winding resultant pitch is____________?
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A. division of front pitch by back pitch

B. difference of front and back pitches

C. multiplication of front and back pitches

D. sum of front and back pitches

786. Which of the following law/rule can he used to determine the direction of rotation of D.C. motor ?
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A. Coloumbs law

B. Lenzs law

C. Faradays law

D. Flemings left-hand rule
787. The type of D.C. motor used for shears and punches is_____________?
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A. series motor

B. shunt motor

C. differential compoutid D.C. motor

D. cumulative compound D.C. motor
788. In a D.C. shunt motor, speed is______________?
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A. proportional to the square of the current

B. independent of armature current

C. inversely proportional to the armature current

D. directly proportional to the armature current

789. Which D.C. motor has got maximum self relieving property ?
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A. Differentially compounded motor

B. Series motor

C. Shunt motor

D. Cumulatively compounded motor

790. If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by______________?
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A. Bl2v2

B. Blv

C. Bl2v

D. Blv2

791. Laminations of core are generally made of________________?
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A. case iron

B. stainless steel

C. carbon

D. silicon steel
792. Which generator would you prefer for feeding long D.C. transmission lines ?
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A. Flat compound generator

B. Shunt generator

C. Series generator

D. Over compound generator
793. In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when_______________?
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A. the generator runs on overload

B. the generator runs on full load

C. there is no load on|he generator

D. the generator runs on designed speed

794. To get the speed of D.C, motor below the normal without wastage of electrical energy is used?
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A. Ward Leonard control

B. any of the above method

C. none of the above method

D. rheostatic control

795. Which motor has the poorest speed control?
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A. Differentially compounded motor

B. Series motor

C. Cumulatively compounded motor

D. Shunt motor

796. The main factor which leads to unstable parallel operation of flat and over compounded generators is_____________?
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A. their rising voltage characteristics

B. unequal speed regulation of their primemovers

C. unequal series field resistances

D. unequal number of turns in their series field windings

797. If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens____________?
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A. this will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses

B. this will make armature to take heavy current, possibly burning it

C. nothing will happen to motor

D. motor will come to stop

798. If a D.C. motor is to be selected for conveyors, which rriotor would be preferred ?
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A. Differentially compound motor

B. Cumulative compound motor

C. Shunt motor

D. Series motor
799. In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be__________________?
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A. 8

B. 4

C. 16

D. 32

800. Where D.C. motor of H.P. 12 or more requires frequent starting, stopping, reversing and speed control______________?
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A. four point starter is used

B. drum type controller is used

C. all above can be used

D. three point starter is used