electrical engineering MCQs – Page 76

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 Review each marked answer and report any item that may be outdated or unclear.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

1501. Which of the following coil will have large resonant frequency __________?
0

A. A coil with large distributed capacitance

B. A coil with low distributed capacitance

C. A coil with large resistance

D. A coil with low resistance

1502. Electrolyte used in a lead-acid cell is__________?
0

A. only water

B. onlyH2S04

C. dilute H2SO4

D. NaOH

1503. What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value________ ?
0

A. 180

B. 90

C. 0

D. 45

1504. As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of___________?
0

A. reducing time of charging

B. increasing cell capacity

C. both (A) and (B)

D. avoiding excessive gassing

1505. The breakdown voltage of a cable depends on_____________?
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A. time of application of the voltage

B. all of the above

C. presence of moisture

D. working temperature

1506. Which of the following statements pertains to resistors only _____________?
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A. connecting them in parallel increases the total value

B. can act as energy storage devices

C. oppose sudden changes in voltage

D. can dissipate considerable amount of power

1507. An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms?
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A. the current through the resistance is more

B. the current through the resistance is less

C. both resistance and inductance carry equal currents

D. none of the above

1508. Persons preparing electrolyte should wear___________?
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A. goggles or other face shield

B. all above safety devices

C. rubber

D. rubber boots and gloves

1509. Inductance of coil___________?
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A. decreases with the increase in supply frequency

B. becomes zero with the increase in supply frequency

C. is unaffected by the supply frequency

D. increases with the increase in supply frequency

1510. The minimum dielectric stress in a cable is at_____________?
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A. armour

B. lead sheath

C. conductor surface

D. bedding

1511. The open circuit voltage of any storage cell depends wholly upon___________?
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A. all above

B. on the strength of its electrolyte

C. its temperature

D. its chemical constituents

1512. In case of three core flexible cable the colour of the neutral is_________?
0

A. blue

B. none of the above

C. black

D. brown

1513. The inductance of a coil can be increased by_________?
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A. choosing core material having high relative permeability

B. decreasing the number of turns

C. decreasing the diameter of the former

D. increasing core length

1514. In a sine wave the slope is constant_______?
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A. between 90 and 180

B. between 0 and 90

C. no where

D. between 180 and 270

1515. In a R-L-C circuit_________?
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A. power is consumed in resistance and is equal to I R

B. exchange of power takes place between inductor and supply line

C. exchange of power does not take place between resistance and the supply line

D. exchange of power takes place between capacitor and supply line

E. all above are correct

1516. In ________ system the charging current is intermittently controlled at either a maximum or minimum value
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A. two rate charge control

B. floating charge

C. an equalizing charge

D. trickle charge

1517. Trickle charging of a storage battery helps to___________?
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A. maintain proper electrolyte level

B. increase its reserve capacity

C. keep it fresh and fully charged

D. prevent sulphation

1518. A dead storage battery can be revived by___________?
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A. none of the above

B. adding distilled water

C. adding so-called battery restorer

D. a dose of H2SO4

1519. The power consumed in a circuit element will be least when the phase difference between the current and voltage is________?
0

A. 0

B. 90

C. 60

D. 180?

1520. Skin effect occurs when a conductor carries current at_______ frequencies
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A. medium

B. high

C. very low

D. low

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