# ONLINE MCQ EE-TRANSMISSION AND DISTRIBUTION 9

Q81. A.C.S.R. conductor having 7 steel stands
surrounded by 25 aluminum conductors
will be specified as
A.  25/7
B.  50/15
C.  7/25
D.  15/50
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Q82. By using bundled conductors which of
the following is reduced ?
A.  Power loss due to corona
B.  Capacitance of the circuit
C.  Inductance of the circuit
D.  None of the above
E.  All of the above
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Q83. The string efficiency of an insulator can
be increased by
A.  correct grading of insulators of
various capacitance’s
B.  reducing the number of strings
C.  increasing the number of strings in
the insulator
D.  none of the above
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Q84. Earthing is necessary to give protection
against
A.  danger of electric shock
B.  voltage fluctuation
D.  high temperature of the conductors
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Q85. If variable part of a.nnual cost on account
of interest and depreciation on the capital
outlay is equal to the annual cost of
electrical energy wasted in the conductors,
the total annual cost will be minimum
and the corresponding size of
conductor will be most economical. This
statement is known as
A.  Kelvin’s law
B.  Ohm’s law
C.  Kirchhoffs law
E.  none of the above
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Q86. The square root of the ratio of line impedance
and shunt admittance is called
the
A.  surge impedance of the line
B.  conductance of the line
C.  regulation of the line
D.  none of the above
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Q87. Which of the following D.C. distribution
system is the simplest and lowest
in first cost, ?
B.  Ring system
C.  Inter-connected system
D.  None of the above
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Q88. High voltage transmission lines use
A.  suspension insulators
B.  pin insulators
C.  both (a) and (b)
D.  none of the above
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Q89. Transmission line insulators are made
of
A.  glass
B.  porcelain
C.  iron
D.  P.V.C.