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CABLES - Part 04

Discussion in 'Electrical & Electronic Engineering (EEE)' started by Nusrat Jahan Parul, Sep 22, 2017.

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  1. Nusrat Jahan Parul

    Nusrat Jahan Parul Moderator Staff Member

    Messages:
    71
    46. Copper as conductor for cables is used as

    (a) annealed
    (b) hardened and tempered
    (c) hard drawn
    (d) alloy with chromium
    Ans: a​

    47. The insulating material should have

    (a) low permittivity
    (b) high resistivity
    (c) high dielectric strength
    (d) all of the above
    Ans: d​

    48. The advantage of oil filled cables is

    (a) more perfect impregnation
    (b) smaller overall size
    (c) no ionisation, oxidation and formation of voids
    (d) all of the above
    Ans: d​

    49. The disadvantage with paper as insulating materialis

    (a) it is hygroscopic
    (6) it has high capacitance
    (c) it is an organic material
    (d) none of the above
    Ans: a​

    50. The breakdown voltage of a cable depends on

    (a) presence of moisture
    (b) working temperature
    (c) time of application of the voltage
    (d) all of the above
    Ans: d​

    51. It is difficult to maintain oil filled cables.

    (a) Yes
    (b) No
    Ans: a​

    51. In capacitance grading a homogeneous dielectric isused.
    (a) Yes
    (b) No
    Ans: b​

    52. In congested areas where excavation is expensive and inconvenient 'draw in system' of laying of underground cables is often adopted.

    (a) Yes
    (b) No
    Ans: a​

    53. Natural rubber is obtained from milky sap of tropicaltrees.

    (a) Yes
    (b) No
    Ans: a​

    54. Rubber is most commonly used insulation in cables.

    (a) Yes
    (b) No
    Ans: a​

    55. Polyethylene has very poor dielectric and ageingproperties.

    (a) Yes
    (b) No
    Ans: b​

    56. The metallic sheath may be made of lead or lead alloy or of aluminium.

    (a) Yes
    (b) No
    Ans: b​
     

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