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ONLINE MCQ EE-ELECTRICAL INSTALLATION & WIRING 4

Harikesh Yadav
Q31. Cables, generally used beyond 66 kV
are
 A.  oil filled
 [Correct Answer]		  B.  S.L. type
 [Wrong Answer]
 C.  belted
 [Wrong Answer]		  D.  armoured
 [Wrong Answer]
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Q32. The electrostatic stress in underground
cables is
 A.  same at the conductor and the
sheath
 [Wrong Answer]		  B.  minimum at the conductor and
maximum at the sheath
 [Wrong Answer]
 C.  maximum at the conductor and
minimum at the sheath
 [Correct Answer]		  D.  zero at, the conductor as well as on
the sheath
 [Wrong Answer]
 E.  none of the above
 [Wrong Answer]
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Q33. Cables for 220 kV lines are invariably
 A.  mica insulated
 [Wrong Answer]		  B.  paper insulated
 [Wrong Answer]
 C.  compressed oil or compressed gas
insulated
 [Correct Answer]		  D.  rubber insulated
 [Wrong Answer]
 E.  none of the above
 [Wrong Answer]
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View Answer  
Rough Work  

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Q34. In a cable immediately above metallic
sheath ____ is provided.
 A.  earthing connection
 [Wrong Answer]		  B.  bedding
 [Correct Answer]
 C.  armouring
 [Wrong Answer]		  D.  none of the above
 [Wrong Answer]
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Q35. In a cable, the maximum stress under
operating conditions is at
 A.  insulation layer
 [Wrong Answer]		  B.  sheath
 [Wrong Answer]
 C.  armour
 [Wrong Answer]		  D.  conductor surface
 [Correct Answer]
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Q36. The relative permittivity of rubber is
 A.  between 2 and 3
 [Correct Answer]		  B.  between 5 and 6
 [Wrong Answer]
 C.  between 8 and 10
 [Wrong Answer]		  D.  between 12 and 14
 [Wrong Answer]
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Q37. The breakdown of insulation of the
cable can be avoided economically by
the use of
 A.  inter-sheaths
 [Wrong Answer]		  B.  insulating materials with different
dielectric constants
 [Wrong Answer]
 C.  both (a) and (b)
 [Correct Answer]		  D.  none of the above
 [Wrong Answer]
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Q38. Is a cable is to be designed for use on
1000 kV, which insulation would you
prefer ?
 A.  Polyvinyle chloride
 [Wrong Answer]		  B.  Vulcanised rubber
 [Wrong Answer]
 C.  Impregnated paper
 [Wrong Answer]		  D.  Compressed SF6 gas
 [Correct Answer]
 E.  none of the above
 [Wrong Answer]
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Q39. Which of the following protects a cable
against mechanical injury ?
 A.  Bedding
 [Wrong Answer]		  B.  Sheath
 [Wrong Answer]
 C.  Armouring
 [Correct Answer]		  D.  None of the above
 [Wrong Answer]
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Q40. The current carrying capacity of cables
in D.C. is more than that in A.C. mainly
due to
 A.  absence of harmonics
 [Wrong Answer]		  B.  non-existence of any stability limit
 [Wrong Answer]
 C.  smaller dielectric loss
 [Correct Answer]		  D.  absence of ripples
 [Wrong Answer]
 E.  none of the above
 [Wrong Answer]
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