electrical engineering MCQs – Page 80

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 Review each marked answer and report any item that may be outdated or unclear.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
1581. On overcharging a battery____________?
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A. it will bring about chemical change in active materials

B. it will increase the capacity of the battery

C. none of the above will occur

D. it will raise the specific gravity of the electrolyte

1582. When the lead-acid cell is fully charged, the electrolyte assumes _______ appearance
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A. dull

B. bright

C. milky

D. reddish

1583. Electrolyte used in an Edison cell is___________?
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A. NaOH

B. HC1

C. KOH

D. HN03

1584. Following will happen if the specific gravity of electrolyte becomes more than 1.23
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A. All above

B. Corrosion of the grids of the plate

C. Loss of capacity

D. Loss of life

1585. In a pure inductive circuit___________?
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A. the current lags behind the voltage by 90

B. the current leads the voltage by 90

C. the current is in phase with the voltage

D. the current can lead or lag by 90

1586. The capacity of a battery is expressed in terms of____________?
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A. none of the above

B. current rating

C. voltage rating

D. ampere-hour rating
1587. Pressure cables are generally not used beyond__________?
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A. 66 kV

B. 132 kV

C. 33 kV

D. 11 kV

1588. Sulphated cells are indicated by____________?
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A. the decrease of the specific gravity

B. the low voltage of the cell on discharge

C. the loss of capacity of the cell

D. all above conditions
1589. Power factor of electric bulb is__________?
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A. lagging

B. unity

C. leading

D. zero

1590. In a parallel R-C circuit, the current always________the applied voltage?
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A. none of the above

B. remains in phase with

C. leads

D. lags

1591. In AC. circuits, laminated iron is invariably used in order to__________?
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A. reduce eddy current loss

B. reduce circuit permeability

C. make assembly cheap and easier

D. increase heat radiation

1592. Time constant of a capacitive circuit__________?
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A. increases with the decrease of capacitance and decrease of resistance

B. increases with the decrease of capacitance and increase of resistance

C. increases with the increase of capacitance and decrease of resistance

D. increase with increase of capacitance and increase of resistance
1593. Form factor for a sine wave is________?
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A. 0.707

B. 0.637

C. 1.11

D. 1.414

1594. The power factor of a D.C. circuit is always__________?
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A. greater than unity

B. unity

C. less than unity

D. zero

1595. Undercharging___________?
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A. reduces specific gravity of the electrolyte

B. increases the temperature

C. produces excessive gassing

D. increases specific gravity of the electrolyte

1596. Hydrogen evolved during charging produces explosive mixture when it is more than___________?
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A. 2%

B. 4%

C. 8%

D. 6%

1597. Internal short circuits are caused by___________?
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A. breakdown of one or more separators

B. excess accumulation of sediment at the bottom of the cell

C. both (A) and (B)

D. none of the above

1598. A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to__________?
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A. peak voltage

B. r.m.s. voltage

C. average voltage

D. none of the above

1599. A battery of 6 cells will show a drop of _______ volts from fully charged state to fully discharged state
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A. 2.4

B. 1.5

C. 1

D. 2.9

1600. The current carrying capacity of cables in D.C. is more than that in A.C. mainly due to__________?
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A. absence of ripples

B. smaller dielectric loss

C. absence of harmonics

D. none of the above

E. non-existence of any stability limit