# ONLINE MCQ EE-ELECTRICAL INSTALLATION & WIRING 4

Q31. Cables, generally used beyond 66 kV
are
A.  oil filled
B.  S.L. type
C.  belted
D.  armoured
 \$(document).ready(function(){ \$(‘#loaddata1613’).click(function(){ qid1613=\$(‘#qid1613’).val(); section1613=\$(‘#section1613’).val(); type1613=\$(‘#type1613’).val(); subtype1613=\$(‘#subtype1613’).val(); \$.post(‘../../fav’,{ qid:qid1613, section: section1613, type: type1613, subtype: subtype1613 },function(ajaxresult){ \$(‘#getrequest1613’).html(ajaxresult); qid1613=\$(‘#qid1613’).val(”); section1613=\$(‘#section1613’).val(”); type1613=\$(‘#type1613’).val(”); subtype1613=\$(‘#subtype1613’).val(”); }); }); }); Explanation:- Answer : A

Q32. The electrostatic stress in underground
cables is
A.  same at the conductor and the
sheath
B.  minimum at the conductor and
maximum at the sheath
C.  maximum at the conductor and
minimum at the sheath
D.  zero at, the conductor as well as on
the sheath
E.  none of the above
 \$(document).ready(function(){ \$(‘#loaddata1614’).click(function(){ qid1614=\$(‘#qid1614’).val(); section1614=\$(‘#section1614’).val(); type1614=\$(‘#type1614’).val(); subtype1614=\$(‘#subtype1614’).val(); \$.post(‘../../fav’,{ qid:qid1614, section: section1614, type: type1614, subtype: subtype1614 },function(ajaxresult){ \$(‘#getrequest1614’).html(ajaxresult); qid1614=\$(‘#qid1614’).val(”); section1614=\$(‘#section1614’).val(”); type1614=\$(‘#type1614’).val(”); subtype1614=\$(‘#subtype1614’).val(”); }); }); }); Explanation:- Answer : C

Q33. Cables for 220 kV lines are invariably
A.  mica insulated
B.  paper insulated
C.  compressed oil or compressed gas
insulated
D.  rubber insulated
E.  none of the above

Q34. In a cable immediately above metallic
sheath ____ is provided.
A.  earthing connection
B.  bedding
C.  armouring
D.  none of the above
 \$(document).ready(function(){ \$(‘#loaddata1616’).click(function(){ qid1616=\$(‘#qid1616’).val(); section1616=\$(‘#section1616’).val(); type1616=\$(‘#type1616’).val(); subtype1616=\$(‘#subtype1616’).val(); \$.post(‘../../fav’,{ qid:qid1616, section: section1616, type: type1616, subtype: subtype1616 },function(ajaxresult){ \$(‘#getrequest1616’).html(ajaxresult); qid1616=\$(‘#qid1616’).val(”); section1616=\$(‘#section1616’).val(”); type1616=\$(‘#type1616’).val(”); subtype1616=\$(‘#subtype1616’).val(”); }); }); }); Explanation:- Answer : B

Q35. In a cable, the maximum stress under
operating conditions is at
A.  insulation layer
B.  sheath
C.  armour
D.  conductor surface
 \$(document).ready(function(){ \$(‘#loaddata1617’).click(function(){ qid1617=\$(‘#qid1617’).val(); section1617=\$(‘#section1617’).val(); type1617=\$(‘#type1617’).val(); subtype1617=\$(‘#subtype1617’).val(); \$.post(‘../../fav’,{ qid:qid1617, section: section1617, type: type1617, subtype: subtype1617 },function(ajaxresult){ \$(‘#getrequest1617’).html(ajaxresult); qid1617=\$(‘#qid1617’).val(”); section1617=\$(‘#section1617’).val(”); type1617=\$(‘#type1617’).val(”); subtype1617=\$(‘#subtype1617’).val(”); }); }); }); Explanation:- Answer : D

Q36. The relative permittivity of rubber is
A.  between 2 and 3
B.  between 5 and 6
C.  between 8 and 10
D.  between 12 and 14
 \$(document).ready(function(){ \$(‘#loaddata1618’).click(function(){ qid1618=\$(‘#qid1618’).val(); section1618=\$(‘#section1618’).val(); type1618=\$(‘#type1618’).val(); subtype1618=\$(‘#subtype1618’).val(); \$.post(‘../../fav’,{ qid:qid1618, section: section1618, type: type1618, subtype: subtype1618 },function(ajaxresult){ \$(‘#getrequest1618’).html(ajaxresult); qid1618=\$(‘#qid1618’).val(”); section1618=\$(‘#section1618’).val(”); type1618=\$(‘#type1618’).val(”); subtype1618=\$(‘#subtype1618’).val(”); }); }); }); Explanation:- Answer : A

Q37. The breakdown of insulation of the
cable can be avoided economically by
the use of
A.  inter-sheaths
B.  insulating materials with different
dielectric constants
C.  both (a) and (b)
D.  none of the above
 \$(document).ready(function(){ \$(‘#loaddata1619’).click(function(){ qid1619=\$(‘#qid1619’).val(); section1619=\$(‘#section1619’).val(); type1619=\$(‘#type1619’).val(); subtype1619=\$(‘#subtype1619’).val(); \$.post(‘../../fav’,{ qid:qid1619, section: section1619, type: type1619, subtype: subtype1619 },function(ajaxresult){ \$(‘#getrequest1619’).html(ajaxresult); qid1619=\$(‘#qid1619’).val(”); section1619=\$(‘#section1619’).val(”); type1619=\$(‘#type1619’).val(”); subtype1619=\$(‘#subtype1619’).val(”); }); }); }); Explanation:- Answer : C

Q38. Is a cable is to be designed for use on
1000 kV, which insulation would you
prefer ?
A.  Polyvinyle chloride
B.  Vulcanised rubber
C.  Impregnated paper
D.  Compressed SF6 gas
E.  none of the above
 \$(document).ready(function(){ \$(‘#loaddata1620’).click(function(){ qid1620=\$(‘#qid1620’).val(); section1620=\$(‘#section1620’).val(); type1620=\$(‘#type1620’).val(); subtype1620=\$(‘#subtype1620’).val(); \$.post(‘../../fav’,{ qid:qid1620, section: section1620, type: type1620, subtype: subtype1620 },function(ajaxresult){ \$(‘#getrequest1620’).html(ajaxresult); qid1620=\$(‘#qid1620’).val(”); section1620=\$(‘#section1620’).val(”); type1620=\$(‘#type1620’).val(”); subtype1620=\$(‘#subtype1620’).val(”); }); }); }); Explanation:- Answer : D

Q39. Which of the following protects a cable
against mechanical injury ?
A.  Bedding
B.  Sheath
C.  Armouring
D.  None of the above
 \$(document).ready(function(){ \$(‘#loaddata1621’).click(function(){ qid1621=\$(‘#qid1621’).val(); section1621=\$(‘#section1621’).val(); type1621=\$(‘#type1621’).val(); subtype1621=\$(‘#subtype1621’).val(); \$.post(‘../../fav’,{ qid:qid1621, section: section1621, type: type1621, subtype: subtype1621 },function(ajaxresult){ \$(‘#getrequest1621’).html(ajaxresult); qid1621=\$(‘#qid1621’).val(”); section1621=\$(‘#section1621’).val(”); type1621=\$(‘#type1621’).val(”); subtype1621=\$(‘#subtype1621’).val(”); }); }); }); Explanation:- Answer : C

Q40. The current carrying capacity of cables
in D.C. is more than that in A.C. mainly
due to
A.  absence of harmonics