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1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ In the cables, sheaths are used to prevent the moisture from entering the cable [other wrong options] [Discuss in forum] provide enough strength provide proper insulation none of the above |
Q22 ⇒ The advantage of cables over overhead
transmission lines is can be used in congested areas [other wrong options] [Discuss in forum] easy maintenance low cost can be used in high voltage circuits |
Q23 ⇒ The breakdown voltage of a cable
depends on all of the above [other wrong options] [Discuss in forum] presence of moisture working temperature time of application of the voltage |
Q24 ⇒ The bedding on a cable consists of any of the above [other wrong options] [Discuss in forum] hessian cloth jute none of the above |
Q25 ⇒ Dielectric strength of rubber is around 30 kV/mm [other wrong options] [Discuss in forum] 5 kV/mm 15 kV/mm 200 kV/man |
Q26 ⇒ The material for armouring on cable is
usually any of the above [other wrong options] [Discuss in forum] steel tape galvanised steel wire none of the above |
Q27 ⇒ The intersheaths in the cables are used
to provide proper stress distribution [other wrong options] [Discuss in forum] minimize the stress avoid the requirement of good insulation none of the above |
Q28 ⇒ The thickness of metallic shielding on
cables is usually 3 to 5 mm [other wrong options] [Discuss in forum] 0.04 mm 0.2 to 0.4 mm 40 to 60 mm |
Q29 ⇒ The insulating material for cables
should have all above properties [other wrong options] [Discuss in forum] be acid proof be non-inflammable be non-hygroscopic |
Q30 ⇒ Low tension cables are generally used
upto 1000 V [other wrong options] [Discuss in forum] 200 V 500 V 700 V |
Q31 ⇒ Cables, generally used beyond 66 kV
are oil filled [other wrong options] [Discuss in forum] S.L. type belted armoured |
Q32 ⇒ The electrostatic stress in underground
cables is maximum at the conductor and minimum at the sheath [other wrong options] [Discuss in forum] same at the conductor and the
sheath minimum at the conductor and maximum at the sheath zero at, the conductor as well as on the sheath none of the above |
Q33 ⇒ Cables for 220 kV lines are invariably compressed oil or compressed gas insulated [other wrong options] [Discuss in forum] mica insulated paper insulated rubber insulated none of the above |
Q34 ⇒ In a cable immediately above metallic
sheath ____ is provided. bedding [other wrong options] [Discuss in forum] earthing connection armouring none of the above |
Q35 ⇒ In a cable, the maximum stress under
operating conditions is at conductor surface [other wrong options] [Discuss in forum] insulation layer sheath armour |
Q36 ⇒ The relative permittivity of rubber is between 2 and 3 [other wrong options] [Discuss in forum] between 5 and 6 between 8 and 10 between 12 and 14 |
Q37 ⇒ The breakdown of insulation of the
cable can be avoided economically by
the use of both (a) and (b) [other wrong options] [Discuss in forum] inter-sheaths insulating materials with different dielectric constants none of the above |
Q38 ⇒ Is a cable is to be designed for use on
1000 kV, which insulation would you
prefer ? Compressed SF6 gas [other wrong options] [Discuss in forum] Polyvinyle chloride Vulcanised rubber Impregnated paper none of the above |
Q39 ⇒ Which of the following protects a cable
against mechanical injury ? Armouring [other wrong options] [Discuss in forum] Bedding Sheath None of the above |
Q40 ⇒ The current carrying capacity of cables
in D.C. is more than that in A.C. mainly
due to smaller dielectric loss [other wrong options] [Discuss in forum] absence of harmonics non-existence of any stability limit absence of ripples none of the above |
Or |