electrical engineering MCQs – Page 78

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 Review each marked answer and report any item that may be outdated or unclear.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
1541. The capacity of a lead-acid cell is measured in_____________?
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A. watts

B. watt-hours

C. amperes

D. ampere-hours
1542. In a cable, the maximum stress under operating conditions is at___________?
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A. insulation layer

B. sheath

C. armour

D. conductor surface
1543. The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of_______degrees?
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A. 45

B. 60

C. 90

D. 30

1544. The body of Edison cell is made of___________?
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A. nickel plated steel

B. aluminium

C. rubber

D. bakelite

1545. The r.m.s. value of pure cosine function is_________?
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A. zero

B. 0.5 of peak value

C. 0.707 of peak value

D. same as peak value

1546. Rubber is most commonly used insulation in cables
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A. No

B. Yes
1547. If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be________?
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A. 100 s

B. 10 s

C. 0.1 s

D. 0.001 s

1548. In constant voltage charging method, the charging current from discharged to fully charged condition_____________?
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A. none of the above

B. remains constant

C. decreases

D. increases

1549. The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of____________?
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A. iron loss in core

B. capacitive effect between adjacent coil turns

C. skin effect

D. increase in temperature

1550. The capacity of a lead-acid cell does not depend on its___________?
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A. rate of charge

B. quantity of active material

C. rate of discharge

D. temperature

1551. Form Factor is the ratio of__________?
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A. average value/peak value

B. average value/r.m.s. value

C. r.m.s. value/average value

D. r.m.s. value/peak value

1552. The average charging voltage for alkali cell is about__________?
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A. 1 V

B. 1.2 V

C. 1.7 V

D. 2.1 V

1553. The safest value of current the human body can carry for more than 3 second is_________?
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A. 9 mA

B. 25 mA

C. 4 mA

D. 15 mA

1554. Shelf life of a small dry cell is___________?
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A. equal to that of large dry cell

B. none of the above

C. less than that of large dry cell

D. more than that of large dry cell

1555. If two sine waves of the same frequency have a phase difference of JT radians, then_______?
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A. both will reach their minimum values at the same instant

B. both will reach their maximum values at the same instant

C. when one wave reaches its maximum value, the other will reach its minimum value

D. none of the above

1556. The lead-acid cell should never be discharged beyond____________?
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A. 2 V

B. 1.8 V

C. 1.9 V

D. 2.1 V

1557. If the length of a cable is doubled, its capacitance____________?
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A. becomes one-half

B. remains unchanged

C. becomes double

D. becomes one-fourth

1558. A cable carrying alternating current has__________?
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A. hysteresis losses only

B. hysteresis, leakage and copper losses only

C. hysteresis and leakage losses only

D. hysteresis, leakage, copper and friction losses

1559. Weston standard cell at 20C has voltage of _______ volts
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A. 1.0187

B. 1.5

C. 0.9

D. 0.8

1560. A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to_________?
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A. the big size of the inductor

B. the reactance of the inductor

C. the current flowing in the inductor

D. the statement given is false