electrical engineering MCQs – Page 335

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 Review each marked answer and report any item that may be outdated or unclear.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
6681. If gate current is increased, then anode-cathode voltage at which SCR closes_________________?
comments icon0

A. Is increased

B. None of the above

C. Remains the same

D. Is decreased
6682. An SCR is made of silicon and not germanium because silicon _________________?
comments icon0

A. Is mechanically strong

B. Has small leakage current

C. Is tetravalent

D. Is inexpensive

6683. In the normal operation of an SCR, anode is __________ w.r.t. cathode?
comments icon0
A. Positive

B. Negative

C. At zero potential

D. None of the above

6684. In case of three core flexible cable the colour of the neutral is_________?
comments icon0

A. none of the above

B. brown

C. black

D. blue
6685. In single core cables armouring is not done to________?
comments icon0

A. either of the above

B. avoid excessive sheath losses

C. none of the above

D. make it flexible

6686. Polyethylene has very poor dielectric and ageing properties
comments icon0

A. Yes

B. No
6687. The insulating material should have____________?
comments icon0

A. low permittivity

B. all of the above

C. high resistivity

D. high dielectric strength

6688. If the length of a cable is doubled, its capacitance____________?
comments icon0

A. becomes one-half

B. becomes one-fourth

C. becomes double

D. remains unchanged

6689. It is difficult to maintain oil filled cables____________?
comments icon0

A. No

B. Yes
6690. In cables the charging current__________?
comments icon0
A. leads the voltage by 90

B. leads the voltage by 180

C. lags the voltage by 180

D. lags the voltage by 90

6691. The disadvantage with paper as insulating material is____________?
comments icon0

A. it has high capacitance

B. it is an organic material

C. it is hygroscopic

D. none of the above

6692. The relative permittivity of rubber is____________?
comments icon0

A. between 5 and 6

B. between 12 and 14

C. between 8 and 10

D. between 2 and 3
6693. Rubber is most commonly used insulation in cables
comments icon0
A. Yes

B. No

6694. The breakdown voltage of a cable depends on_____________?
comments icon0

A. working temperature

B. all of the above

C. presence of moisture

D. time of application of the voltage

6695. Cables, generally used beyond 66 kV are___________?
comments icon0
A. oil filled

B. belted

C. armoured

D. S.L. type

6696. The insulating material for cables should____________?
comments icon0
A. have all above properties

B. be non-inflammable

C. be acid proof

D. be non-hygroscopic

6697. Empire tape is__________?
comments icon0

A. impregnated paper

B. vulcanised rubber

C. none of the above

D. varnished cambric
6698. Which of the following insulation is used in cables ?
comments icon0

A. Rubber

B. Any of the above

C. Paper

D. Varnished cambric

6699. cables are used for 132 kV lines____________?
comments icon0

A. Super tension

B. High tension

C. Extra super voltage

D. Extra high tension

6700. Underground cables are laid at sufficient depth___________?
comments icon0

A. for all of the above reasons

B. to minimize the effect of shocks and vibrations due to gassing vehicles, etc

C. to minimise temperature stresses

D. to avoid being unearthed easily due to removal of soil