electrical engineering MCQs – Page 167

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 Review each marked answer and report any item that may be outdated or unclear.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
3321. In a particular biasing circuit, the value of RE is about _________________?
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A. 100 kO

B. 1 MO

C. 800 O

D. 10 kO

3322. The travelling speed of cranes varies from_________________?
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A. 5 to 10 m/s

B. 1 to 2.5 m/s

C. 20 to 30 m/s

D. 10 to 15 m/s

3323. As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor_______________?
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A. Increases

B. Remains the same

C. Decreases

D. None of the above

3324. The barrier voltage at a pn junction for germanium is about________________?
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A. 0.3 V

B. Zero

C. 5 V

D. 3 V

3325. Overhead lines for power supply to tramcars are at a minimum height of______________?
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A. 3 m

B. 10 m

C. 15 m

D. 6 m

3326. An n-type semiconductor is______________?
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A. None of the above

B. Negatively charged

C. Positively charged

D. Electrically neutral
3327. In which of the following applications variable speed operation is preferred ?
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A. Ceiling fan

B. Water pump

C. Refrigerator

D. Exhaust fan

3328. The resistance encountered by a train in motion is on account of_________________?
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A. friction at various parts of the rolling stock

B. all of the above

C. resistance offered by air

D. friction at the track

3329. If the co-efficient of adhesion on dry rails is 0.26, which of the following could be the value for wet rails ?
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A. 0.225

B. 0.26

C. 0.16

D. 0.3

3330. For a motor-generator set which of the following motors will be preferred ?
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A. Squirrel cage induction motor

B. Pole changing induction motor

C. Slip ring induction motor

D. Synchronous motor
3331. Co-efficient of adhesion is________________-?
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A. high in case of D.C. traction than in the case of AC. traction

B. low in case of D.C. traction than in the case of AC. traction

C. equal in both AC. and D.C. traction

D. any of the above

3332. Transistor biasing represents ______________ conditions?
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A. a.c

B. d.c

C. both a.c. and d.c

D. none of the above

3333. A reverse biased pn junction has resistance of the order of________________?
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A. kO

B. None of the above

C. O

D. MO
3334. Which of the following motors has series characteristics ?
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A. None of the above

B. Shaded pole motor

C. Repulsion motor

D. Capacitor start motor

3335. The stabilisation of operating point in potential divider method is provided by_______________?
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A. RC consideration

B. VCC consideration

C. None of the above

D. RE consideration
3336. Ward-Leonard controlled D.C. drives are generally used for _____________________ excavators?
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A. All of the above

B. Light duty

C. Medium duty

D. Heavy duty
3337. A hole in a semiconductor is defined as_________________?
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A. A free electron

B. strong>. A free proton

C. A free neutron

D. The incomplete part of an electron pair bond
3338. Addition of pentavalent impurity to a semiconductor creates many________________?
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A. Bound electrons

B. Free electrons

C. Holes

D. Valence electrons

3339. In voltage divider bias, operating point is 3 V, 2 mA. If VCC = 9 V, RC = 2.2 kO, what is the value of RE ?
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A. 2000 O

B. 800 O

C. 1400 O

D. 1600 O

3340. The binary number 10101 is equivalent to decimal number_________________?
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A. 19

B. 12

C. 21

D. 27