cables MCQs – Page 3

Practise focused cables questions with marked answers for exam preparation and subject revision.

cables Mcqs
41. The thickness of the layer of insulation on the conductor, in cables, depends upon___________?
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A. voltage

B. reactive power

C. power factor

D. current carrying capacity

42. The intersheaths in the cables are used to_____________?
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A. avoid the requirement of good insulation

B. provide proper stress distribution

C. none of the above

D. minimize the stress

43. In the cables, the location of fault is usually found out by comparing____________?
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A. the resistance of the conductor

B. the capacitances of insulated conductors

C. all above parameters

D. the inductance of conductors

44. Low tension cables are generally used up to___________?
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A. 500 V

B. 1000 V

C. 700 V

D. 200 V

45. The advantage of cables over overhead transmission lines is___________?
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A. can be used in congested areas

B. can be used in high voltage circuits

C. low cost

D. easy maintenance

46. The bedding on a cable consists of____________?
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A. none of the above

B. any of the above

C. jute

D. hessian cloth

47. In a cable, the maximum stress under operating conditions is at___________?
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A. insulation layer

B. armour

C. sheath

D. conductor surface
48. If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be______________?
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A. 400 cm

B. 50 cm

C. 10 cm

D. 2 cm

49. In a cable immediately above metallic sheath ______ is provided
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A. none of the above

B. armouring

C. earthing connection

D. bedding
50. In a cable the voltage stress is maximum at____________?
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A. sheath

B. insulator

C. core of the conductor

D. surface of the conductor

51. The insulation of the cable decreases with__________?
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A. the decrease in the length of the insulation

B. either A. or (b)

C. the increase in length of the insulation

D. none of the above

52. The insulating material for a cable should have__________?
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A. low cost

B. high dielectric strength

C. high mechanical strength

D. all of the above
53. High tension cables are generally used up to_____________?
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A. 132 kV

B. 11kV

C. 66 kV

D. 33kV

54. A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become_____________?
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A. double

B. none of the above

C. four times

D. one half
55. In capacitance grading of cables we use a _______ dielectric?
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A. homogeneous

B. hygroscopic

C. composite

D. porous

56. Dielectric strength of rubber is around____________?
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A. 5 kV/mm

B. 30 kV/mm

C. 15 kV/mm

D. 200 kV/mm

57. Capacitance grading of cable implies__________?
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A. use of dielectrics of different permeabilities

B. cables using single dielectric in different concentrations

C. capacitance required to be introduced at different lengths to counter the effect of inductance

D. none of the above

E. grading according to capacitance of cables per km length