electrical engineering MCQs – Page 358

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 Review each marked answer and report any item that may be outdated or unclear.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

7141. Ampere hour capacity of an industrial battery is based on _______ hours discharge rate
0

A. 8

B. 24

C. 12

D. 16

7142. ______ of electrolyte indicates the state of charge of the battery
0

A. specific gravity

B. viscosity

C. mass

D. colour

7143. In alkaline cell the electrolyte is_____________?
0

A. KOH

B. concentrated sulphuric acid

C. NaOH

D. dilute sulphuric acid

7144. If a lead-acid cell is discharged below 1.8 V the following will happen.____________?
0

A. Capacity of cell will reduce

B. All above will occur

C. Internal resistance will increase

D. Sulphation of plates will occur

7145. Which of the following is incorrect ?
0

A. A primary cell has an irreversible chemical reaction

B. A carbon-zinc cell has unlimited shelf life

C. A lead-acid cell can be recharged

D. A storage cell has a reversible chemical reaction

7146. The current flow through electrolyte is due to the movement of____________?
0

A. electrons

B. ions

C. none of the above

D. holes

7147. The lead-acid cell should never be discharged beyond____________?
0

A. 2 V

B. 1.8 V

C. 2.1 V

D. 1.9 V

7148. The specific gravity of electrolyte is measured by____________?
0

A. a mechanical gauge

B. psychrometer

C. manometer

D. hydrometer

7149. Sulphated cells are indicated by____________?
0

A. the loss of capacity of the cell

B. the decrease of the specific gravity

C. the low voltage of the cell on discharge

D. all above conditions

7150. The active materials on the positive and negative plates of a fully charged lead-acid battery are_______?
0

A. none of the above

B. lead peroxide and lead

C. lead and lead peroxide

D. lead sulphate and lead

7151. The e.m.f. of an Edison cell, when fully charged, is nearly______________?
0

A. 1.4 V

B. 1 V

C. 0.9 V

D. 0.8 V

7152. Electrolyte used in a lead-acid cell is__________?
0

A. NaOH

B. onlyH2S04

C. only water

D. dilute H2SO4

7153. Internal resistance of a cell is reduced by__________?
0

A. all above methods

B. putting plates very close together

C. using vent plug to permit gas formed during discharge

D. increasing the plate area

7154. Following will occur if level of electrolyte falls below plates____________?
0

A. life of the cell is reduced

B. all above

C. open plates are converted to lead sulphate

D. capacity of the cell is reduced

7155. 48 ampere-hour capacity would deliver a current of___________?
0

A. 6 amperes for 8 hours

B. 48 amperes for 1 hour

C. 8 amperes for 6 hours

D. 24 amperes for 2 hours

7156. The output voltage of a charger is__________?
0

A. less than the battery voltage

B. the same as the battery voltage

C. higher than the battery voltage

D. none of the above

7157. Self charge of a Ni-Fe cell is _______ Edison cell
0

A. much more than

B. more than

C. less than

D. equal to

7158. Excessive charging a battery tends to____________?
0

A. to corrode the positive plates into lead peroxide thereby weakening them physically

B. produce gassing

C. bring about all above changes

D. increase the internal resistance of the battery

7159. When the specific gravity of the electrolyte of a lead-acid cell is reduced to 1.1 to 1.15 the cell is in___________?
0

A. charged state

B. discharged state

C. both (A) and (B)

D. active state

7160. The capacity of a lead-acid cell depends on
0

A. rate of discharge

B. all above

C. temperature

D. density of electrolyte

E. quantity of active materials

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