electrical engineering MCQs – Page 336

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 Review each marked answer and report any item that may be outdated or unclear.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
6701. If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be_______________?
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A. 15 kV/mm

B. 30 kV/mm

C. 10 kV/mm

D. 5 kV/mm

6702. Copper as conductor for cables is used as________?
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A. hard drawn

B. hardened and tempered

C. alloy with chromium

D. annealed
6703. The electrostatic stress in underground cables is_________?
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A. none of the above

B. same at the conductor and the sheath

C. maximum at the conductor and minimum at the sheath

D. zero at the conductor as well as on the sheath

E. minimum at the conductor and maximum at the sheath

6704. In congested areas where excavation is expensive and inconvenient draw in system of laying of underground cables is often adopted
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A. Yes

B. No

6705. In the cables, sheaths are used to___________?
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A. provide enough strength

B. none of the above

C. prevent the moisture from entering the cable

D. provide proper insulation

6706. PVC stands for____________?
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A. positive voltage conductor

B. pressed and varnished cloth

C. post varnish conductor

D. polyvinyl chloride

E. none of the above

6707. The advantage of oil filled cables is_________?
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A. more perfect impregnation

B. smaller overall size

C. all of the above

D. no ionisation, oxidation and formation of voids

6708. Conduit pipes are normally used to protect _______ cables
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A. PVC sheathed cables

B. all of the above

C. unsheathed cables

D. armoured

6709. In capacitance grading a homogeneous dielectric is used
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A. Yes

B. No
6710. The material for armouring on cable is usually__________?
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A. any of the above

B. none of the above

C. galvanised steel wire

D. steel tape

6711. Which of the following protects a cable against mechanical injury___________?
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A. Armouring

B. Bedding

C. None of the above

D. Sheath

6712. The surge resistance of cable is__________?
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A. 100 ohms

B. 50 ohms

C. 5 ohms

D. 20 ohms

6713. A cable carrying alternating current has__________?
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A. hysteresis, leakage, copper and friction losses

B. hysteresis losses only

C. hysteresis and leakage losses only

D. hysteresis, leakage and copper losses only

6714. Pressure cables are generally not used beyond__________?
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A. 66 kV

B. 33 kV

C. 132 kV

D. 11 kV

6715. The breakdown of insulation of the cable can be avoided economically by the use of___________?
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A. inter-sheaths

B. insulating materials with different dielectric constants

C. both (A) and (B)

D. none of the above

6716. The minimum dielectric stress in a cable is at_____________?
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A. conductor surface

B. bedding

C. lead sheath

D. armour

6717. Solid type cables are considered unreliable beyond 66 kV because___________?
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A. skin effect dominates on the conductor

B. there is a danger of breakdown of insulation due to the presence of voids

C. of corona loss between conductor and sheath material

D. insulation may melt due to higher temperature

6718. The thickness of metallic shielding on cables is usually_______________?
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A. 0.04 mm

B. 3 to 5 mm

C. 40 to 60 mm

D. 0.2 to 0.4 mm

6719. Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ____________?
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A. Compressed SFe gas

B. Polyvinyle chloride

C. Impregnated paper

D. none of the above

E. Vulcanised rubber

6720. 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 harmonics

B. none of the above

C. non-existence of any stability limit

D. absence of ripples

E. smaller dielectric loss