MCQ
2961. Transmission lines are transposed to reduce-
ferranti effect
skin effect
proximity effect
all of above
2962. A 3-layer and diameter of each strand is d, then find the total diameter of ACSR conductor.
2d
d
3d
5d
2963. Under excited synchronous phase modifier works as-
shunt capacitor
shunt reactor
series capacitor
any of the above
2964. Skin effect depends on-
frequency
conductivity
relative permeability
all of the above
2965. If we increase the spacing between the phase conductors, the line capacitance-
increases
decreases
remains unaffected
none of the above
2966. Proximity effect depends on--
frequency
distance between the conductors
relative permeability
all of the above
2967. Surge impedance loading of a transmission line can be increased by-
increasing its voltage level
addition of lumped inductance in parallel
addition of lumped capacitance in series
both 1 and 3
2968. Which of the following transmission line is most practically used in load flow analysis?
Nominal T
Nominal II
either 1 or 2
nether1 nor 2
2969. If skin depth is more, then skin effect is--
more
less
either 1 or 2
none of the above
2970. If the diameter of the conductor is increased-
the inductance is increased
the inductance is decreased
the resistance is increased
no change in inductance and resistance
2971. Condition for maximum voltage regulation-
tanφ = X/R
Cosφ = X/R
tanφ = R/X
Cosφ = R/X
2972. Zero voltage regulation is possible only for-
lagging power factor
unity power factor
leading power factor
all of the above
2973. Apart from the skin effect the non-a of the current distribution is also caused by--
bundled conductors
ferranti effect
proximity effect
all of the above
2974. The fact that current density is higher at the surface when compared to centre is known as--
corona
proximity effect
skin effect
all of the above
2975. A transmission line has 50km operating at frequency of 500Hz. Find the type of the line.
long transmission line
short transmission line
medium transmission line.
any of the above
2976. If we increase the length of the transmission line, the charging current-
increases
decreases
remains unaffected
none of the above
2977. In transmission lines distribution constants--
resistance
inductance and capacitance
inductance and resistance
both 1 and 2
2978. Skin effective is more in case of
communication lines
same in both cases
power lines
none of the above
2979. Find the number of strands of ACSR conductor for 3-layer transmission line.
1
7
19
29
2980. If sparsity of a 5 bus transmission line is 0.4. Find the number of transmission lines--
6
5
8
3