electrical engineering MCQs – Page 357

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 Review each marked answer and report any item that may be outdated or unclear.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

7121. In a lead-acid cell, if the specific gravity of sulphuric acid is 1.8, it will require following ratio of acid to water to get mixture of specific gravity of 1.3
0

A. 4 parts of acid to 4 parts of water

B. 4 parts of acid to 6 parts of water

C. 6 parts of acid to 4 parts of water

D. 4 parts of acid to 8 parts of water

7122. The effect of sulphation is that the internal resistance__________?
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A. decreases

B. increases

C. none of the above

D. remains same

7123. The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity. The statement is associated with____________?
0

A. Faradays law of electromagnetic

B. Faradays law of electrolysis

C. Gausss law

D. Newtons law

7124. A dead storage battery can be revived by___________?
0

A. a dose of H2SO4

B. none of the above

C. adding so-called battery restorer

D. adding distilled water

7125. Each cell has a vent cap________?
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A. to add water to the cell if needed

B. to check the level of electrolyte

C. to allow gases out when the cell is on charge

D. to do all above functions

7126. Following will happen if the specific gravity of electrolyte becomes more than 1.23
0

A. All above

B. Loss of life

C. Corrosion of the grids of the plate

D. Loss of capacity

7127. Excessive formation of lead sulphate on the surface of the plates happens because of___________?
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A. low level of electrolyte

B. all above

C. persistent undercharging

D. allowing a battery to stand in discharged condition for a long time

E. topping up with electrolyte

7128. Cells are connected in series in order to_____________?
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A. increase the life of the cells

B. increase the voltage rating

C. none of the above

D. increase the current rating

7129. In a battery cover is placed over the element and sealed to the top of the battery container. This is done____________?
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A. to reduce evaporation of water from electrolyte

B. to exclude dirt and foreign matter from the electrolyte

C. to discharge both of the above functions

D. to discharge none of the above functions

7130. While preparing electrolyte for a lead-acid battery___________?
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A. water is poured into acid

B. anyone of the two can be added to other chemical

C. acid is poured into water

7131. Five 2 V cells are connected in parallel. The output voltage is__________?
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A. 2 V

B. 1.75 V

C. 1 V

D. 1.5 V

7132. Which of the following factors adversely affects the capacity of the leadacid battery ?
0

A. Temperature of surroundings

B. Specific gravity of electrolyte

C. Rate of discharge

D. All of the above

7133. On overcharging a battery____________?
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A. it will increase the capacity of the battery

B. none of the above will occur

C. it will raise the specific gravity of the electrolyte

D. it will bring about chemical change in active materials

7134. The substances which combine together to store electrical energy during the charge are called ________ materials
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A. active

B. passive

C. inert

D. dielectric

7135. On the average the ampere-hour efficiency of an Edison cell is about__________?
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A. 70%

B. 40%

C. 80%

D. 60%

7136. The internal resistance of a lead-acid cell is that of Edison cell____________?
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A. equal to

B. less than

C. more than

D. none of the above

7137. The capacity of a battery is expressed in terms of____________?
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A. voltage rating

B. current rating

C. none of the above

D. ampere-hour rating

7138. When the load resistance equals the generator resistance which of the following will be maximum __________?
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A. Efficiency of the circuit

B. Power in the load resistance

C. Current

D. Voltage across the load resistance

7139. When two batteries are connected in parallel, it should be ensured that___________?
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A. they have same ampere-hour capacity

B. they have identical internal resistance

C. they have same e.m.f.

D. they have same make

7140. Those substances of the cell which take active part in chemical combination and hence produce electricity during charging or discharging are known as________materials
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A. passive

B. active

C. redundant

D. inert

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