electrical engineering MCQs – Page 266

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 Review each marked answer and report any item that may be outdated or unclear.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

5301. An n-type semiconductor is______________?
0

A. Electrically neutral

B. Negatively charged

C. Positively charged

D. None of the above

5302. A reverse biased pn junction has resistance of the order of________________?
0

A. O

B. kO

C. None of the above

D. MO

5303. At room temperature, an intrinsic silicon crystal acts approximately as_______________?
0

A. A conductor

B. An insulator

C. A piece of copper wire

D. A battery

5304. A pn junction acts as a__________________?
0

A. Unidirectional switch

B. Bidirectional switch

C. Controlled switch

D. None of the above

5305. A semiconductor has generally_______________valence electrons?
0

A. 3

B. 2

C. 4

D. 6

5306. The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be___________?
0

A. at the slot edge where coil enters or comes out of the slot

B. at the end connections

C. at the end terminals

D. anywhere on the winding inside a slot

5307. Which of the following motor will give the highest starting torque ?
0

A. D.C. shunt motor

B. Repulsion start and induction run motor

C. Universal motor

D. Schrage motor

5308. The power factor of a single-phase induction motor is usually?
0

A. always leading

B. lagging

C. unity

D. unity to 0.8 leading

5309. Which of the following motors is used in a situation where load increases with speed ?
0

A. Hysteresis motor

B. Induction motor

C. Three-phase series motor

D. Schrage motor

5310. In split phase motor main winding is of _____________?
0

A. thin wire placed at the bottom of the slots

B. thick wire placed at the top of the slots

C. thin wire placed at the top of the slots

D. thick wire placed at the bottom of the slots

5311. A schrage motor can run on___________?
0

A. positive slip

B. zero slip

C. all of the above

D. negative slip

5312. A centrifugal switch is used to dis- connect starting winding when motor has___________?
0

A. picked up about 50 to 70 per cent of rated speed

B. run for about 1 minute

C. picked up about 10 to 25 per cent of rated speed

D. run for about 5 minutes

5313. After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on ______________?
0

A. running winding

B. compensating winding

C. field winding

D. rotor winding

5314. The range of efficiency for shaded pole motors is______________?
0

A. 80% to 90%

B. 5% to 35%

C. 95% to 99%

D. 50% to 75%

5315. A single-phase induction motor is__________?
0

A. inherently non-self-starting with low torque

B. inherently self-starting with low torque

C. inherently non-self-starting with high torque

D. inherently self-starting with high torque

5316. In a single phase motor the centrifugal switch____________?
0

A. reconnects the auxiliary winding of the motor

B. disconnects auxiliary winding of the motor

C. reconnects the main winding the motor

D. disconnects main winding of the motor

5317. In a split phase motor____________?
0

A. the starting winding is connected through a centrifugal switch

B. the running winding is connected through a centrifugal switch

C. both starting and running windings are connected through a centrifugal switch

D. centrifugal switch is used to control supply voltage

5318. Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a___________?
0

A. thermal relay

B. none of the above

C. centrifugal switch

D. magnetic relay

5319. If the capacitor of a single-phase motor is short-circuited_________?
0

A. the motor will not start

B. the motor will run in reverse direction

C. the motor will run in the same direction at reduced r.p.m

D. the motor will run

5320. Hysteresis motor is particularly useful for high-quality record players and tape-recorders because___________?
0

A. it revolves synchronously

B. it is not subject to any magnetic or mechanical vibrations

C. it can be easily manufactured in extremely small sizes of up to 1 W output

D. it develops hysteresis torque which is extremely steady both in amplitude and phase

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