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Engineering :: Energy Conversion


111.  The insulators for overhead lines are generally made of
A. Copper B. Aluminium
C. Wood D. Porcelain
E. Plastic    

112.  By increasing sag in the suspended transmission line
A. Tension in the line decreases B. Tension in the line increases
C. Current carrying capacity of conductor increases D. Current carrying capacity of conductor decreases
E. None of the above    

113.  Sag is provided in overhead transmission lines so that
A. Repairs can be done easily B. Corona can be reduced
C. Skia effect can be reduced D. Safe tension is not exceeded
E. None of the above    

114.  The string efficiency in an ac system is
A. Zero B. 25%
C. 50% D. 70.70%
E. 100%    

115.  A 66 kV transmission line carrying power to a distance of 120 kilometre will be termed as
A. Tiny transmission line B. Very short transmission line
C. Short transmission line D. Medium transmission line
E. Long transmission line    

116.  In a medium transmission line the effect of
A. resistance is negligible B. capacitance is negligible
C. inductance is negligible D. resistance and inductance is negligible but effect of capacitance is taken into account
E. resistance, capacitance and inductance is taken into account    

117.  A 132 kV transmission line carrying power through a distance of 250 kilometers will be termed as
A. Very short transmission line B. Short transmission line
C. Long transmission line D. Trunk line
E. None of the above    

118.  In a long transmission line, the effect of
A. resistance and capacitance is taken into account but effect of inductance is neglected B. resistance and inductance is taken into account but effect of capacitance is neglected
C. capacitance and inductance is taken into account but effect of resistance is neglected D. resistance, capacitance and inductance is taken into account
E. resistance, capacitance and inductance is neglected    

119.  the main cause of power loss in a transmission line is
A. Resistance B. capacitance is negligible
C. Inductance D. Both inductance and capacitance
E. None of the above    

120.  In any transmission line
A. ?BC = 1 - AD B. AB = CD + 1
C. AB - CD = -1 D. AC = BD + 1
E. AC - BD = -1    




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