electrical engineering MCQs – Page 48

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 Review each marked answer and report any item that may be outdated or unclear.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
941. The shape of the torque/slip curve of induction motor is__________?
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A. rectangular parabola

B. parabola

C. hyperbola

D. straigth line

942. Slip ring motor is recommended where____________?
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A. high starting torque is needed

B. frequent starting, stopping and reversing is required

C. speed control is required

D. all above features are required
943. In a ceilingfan employing capacitor run motor____________?
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A. secondary winding surrounds the primary winding

B. primary winding surrounds the secondary winding

C. both are usual arrangements

D. none of the above

944. The wattage rating for a ceiling fan motor will be in the range_________?
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A. 50 to 150 W

B. 10 to 20 W

C. 250 to 500 W

D. 200 to 250 W

945. When a D.C. series motor is connected to A.C. supply, the power factor will be low because of____________?
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A. induced current in rotor due to variations of flux

B. fine copper wire winding

C. none of the above

D. high inductance of field and armature circuits
946. A 3-phase induction motor stator delta connected, is carrying full load and one of its fuses blows out. Then the motor_______________?
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A. will continue running burning its one phase

B. will stop and carry heavy current causing permanent damage to its winding

C. will continue running without any harm to the winding

D. will continue running burning its two phases

947. Which of the following single-phase motors has relatively poor starting torque ?
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A. Capacitor motor

B. All single phase motors have zero starting torque

C. Universal motor

D. Repulsion motor

948. The power scale of circle diagram of an induction motor can be found from__________?
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A. short-circuit test only

B. no-load test only

C. noue of the above

D. stator resistance test

949. A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will______________?
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A. start and then stop

B. start and run at rated speed

C. start and run slowly

D. not start at all
950. Low voltage at motor terminals is due to____________?
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A. inadequate motor wiring

B. none of the above

C. poorely regulated power supply

D. any one of the above
951. The wattage of motor for driving domestic sewing machine will be around__________?
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A. 10 to 30 W

B. 40 to 75 W

C. 100 to 150 W

D. 5 to 10 W

952. Which of the following motors is inherently self starting ?
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A. Shaded-pole motor

B. Split motor

C. None of these

D. Reluctance motor

953. The vafcie of transformation ratio of an induction motor can be found by__________?
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A. short-circuit test only

B. stator resistance test

C. open-circuit test only

D. none of the above

954. The torque developed in the cage induction motor with autostarter is___________?
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A. K2 x torque with direct switching

B. K x torque with direct switching

C. k/torque with direct switching

D. k2/torque with direct switching

955. The starting torque of a squirrel-cage induction motor is___________?
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A. slightly more than full-load torque

B. low

C. negligible

D. same as full-load torque

956. In case of high speed universal motor which of the following needs more attention?
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A. Air gap

B. Insulation in rotor

C. Balancing of rotor

D. End play

957. The synchronous motor is not inherently self-starting because_______________?
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A. a rotating magnetic field does not have enough poles

B. the starting device to accelerate the rotor to near synchronous speed is absent

C. the force required to accelerate the rotor to the synchronous speed in an instant is absent

D. the rotating magnetic field is produced by only 50 Hz frequency currents

958. The speed regulation of a synchronous motor is always___________?
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A. 1%

B. zero

C. positive

D. 0.50%

959. Synchronous motors are generally not self-starting because:
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A. starting winding is not provided on the machines

B. startes cannot be used on these machines

C. the direction of instantaneous torque reverses after half cycle

D. the direction of rotation is not fixed

960. A reluctance motor____________?
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A. all of the above

B. needs no D.C. excitation

C. is self-starting

D. is constant speed motor