electrical engineering MCQs – Page 271

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 Review each marked answer and report any item that may be outdated or unclear.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

5401. If a particular application needs high speed and high starting torque, then which of the following motor will be preferred ?
0

A. Shaded pole type motor

B. Capacitor start and run motor

C. Capacitor start motor

D. Universal motor

5402. Which of the following single-phase motors has relatively poor starting torque ?
0

A. Universal motor

B. All single phase motors have zero starting torque

C. Repulsion motor

D. Capacitor motor

5403. Speed control of a universal motor is achieved by__________?
0

A. all of the above methods

B. applying variable voltage by means of silicon controlled rectifier

C. applying variable voltage by means of variable auto-transformer

D. connecting rheostat in series

E. varying field flux with tapped field windings

5404. Which of the following single-phase induction motors is generally used in time phonographs ?
0

A. Resistance start

B. Capacitor start capacitor run

C. Shaded pole

D. Universal

5405. In a A.C. series motor armature coils are usually connected to commutator____________?
0

A. solidly

B. through capacitors

C. through reactances

D. through resistance

5406. A universal motor can run on___________?
0

A. A.C. only

B. either A.C. or D.C.

C. D.C. only

D. none of the above

5407. Which of the following statements regarding reluctance-start motor is incorrect ?
0

A. So far as its basic working principle is concerned, it is similar to shaded pole motor

B. It is basically an induction motor and not a synchronous one

C. It is similar to reluctance motor

D. the air-gap between rotor and salient poles is non- uniform

5408. Torque developed by a single phase induction motor at starting is_____________?
0

A. uniform

B. pulsating

C. nil

D. none of the above

5409. In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will_____________?
0

A. draw excessive armature current and may burn out

B. fall out of synchronism and come to stand still

C. run as induction motor

D. become unstable

5410. In case of high speed universal motor which of the following needs more attention?
0

A. End play

B. Air gap

C. Insulation in rotor

D. Balancing of rotor

5411. Which of the following motors is used in mixies ?
0

A. Repulsion motor

B. Hysteresis motor

C. Reluctance motor

D. Universal motor

5412. Direction of rotation of a split phase motor can be reversed by reversing the connection of__________?
0

A. running winding only

B. starting winding only

C. either A. or (b)

D. both A. and (b)

5413. The value of starting capacitor of a fractional horse power motor will be__________?
0

A. 300 uF

B. 200 uF

C. 400 uF

D. 100 uF

5414. In a hysteresis motor, the rotor must have____________?
0

A. none of the above

B. susceptibility

C. retentivity

D. resistivity

5415. A repulsion motor is equipped with__________?
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A. slip rings

B. commutator

C. both A. and (b)

D. none of the above

5416. The reverse current in a diode is of the order of _____________?
0

A. mA

B. ?A

C. A

D. kA

5417. The doping level in a zener diode is______________ that of a crystal diode?
0

A. more than

B. the same as

C. less than

D. none of the above

5418. A zener diode has ______________ breakdown voltage?
0

A. zero

B. none of the above

C. sharp

D. undefined

5419. If the PIV rating of a diode is exceeded,_______________?
0

A. the diode is destroyed

B. the diode behaves like a zener diode

C. none of the above

D. the diode conducts poorly

5420. A crystal diode has______________?
0

A. two pn junctions

B. none of the above

C. three pn junctions

D. one pn junction

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