electrical engineering MCQs – Page 172

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 Review each marked answer and report any item that may be outdated or unclear.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
3421. The purpose of resistance in the emitter circuit of a transistor amplifier is to _________________?
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A. None of the above

B. Limit the maximum emitter current

C. Limit the change in emitter current

D. Provide base-emitter bias

3422. Heat control switches are used in__________________?
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A. single phase

B. three phase induction motors

C. cooling ranges

D. transformers

3423. The pulsating torque exerted by steam locomotives causes which of the following ?
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A. Hammer blow

B. All of the above

C. Jolting and skidding

D. Pitching

3424. Which of the following is the advantage of electric braking ?
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A. More heat is generated during braking

B. It avoids wear of track

C. Motor continues to remain loaded during braking

D. It is instantaneous

3425. The voltage used for suburban trains in D.C. system is usually_______________?
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A. 12 V

B. 220 V

C. 24 V

D. 600 to 750 V
3426. ________________ frequency is not common in low frequency traction system?
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A. 25 Hz

B. non of these

C. 16 Hz

D. 40 Hz
3427. Addition of trivalent impurity to a semiconductor creates many_______________?
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A. Valence electrons

B. Bound electrons

C. Holes

D. Free electrons

3428. Which of the following braking systems is used on steam locomotives ?
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A. Vacuum system

B. Hydraulic system

C. None of the above

D. Pneumatic system

3429. In case of _________________ free running and coasting periods are generally long ?
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A. all of the above

B. main-line service

C. sub-urban service

D. urban service

3430. Transistor biasing is generally provided by a_______________?
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A. Bias battery

B. Diode

C. None of the above

D. Biasing circuit
3431. Heavy duty cranes are used in________________?
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A. heavy engineering workshops

B. all of the above

C. ore handling plants

D. steel plants

3432. Which of the following is the disadvantage of electric traction over other systems of traction ?
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A. Corrosion problems in the under-ground pipe work

B. All of the above

C. High capital outlay in fixed installations beside route limitation

D. Short time power failure interrupts traffic for hours

E. Interference with communication lines

3433. Excess-3 code is known as_________________?
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A. Algebraic code

B. Self-complementing code

C. Cyclic redundancy code

D. Weighted code

3434. Digital circuit can be made by the repeated use of________________?
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A. None of the above

B. NAND gates

C. OR gates

D. NOT gates

3435. For which of the following applications motor has to start with high acceleration ?
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A. Centrifugal pump

B. Oil expeller

C. Lifts and hoists

D. Floor mill

3436. By the use of which of the following m D.C. can be obtained from AC. ?
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A. Mercury arc rectifier

B. Motor generator set

C. Silicon diodes

D. Any of the above
3437. The normal value of adhesion friction is______________?
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A. 0.4

B. 0.12

C. 0.75

D. 0.25
3438. The battery connections required to forward bias a pn junction are_________________?
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A. +ve terminal to p and ve terminal to n

B. #NAME?

C. #NAME?

D. None of the above

3439. The zero signal IC is generally ______________ mA in the initial stages of a transistor amplifier?
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A. More than 10

B. 1

C. 4

D. 3

3440. The operating point ________________ on the a.c. load line?
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A. May or may not lie

B. Data insufficient

C. Also line

D. Does not lie