Power System - I (3140914) MCQs

MCQs of Transmission Line Parameters

Showing 91 to 100 out of 103 Questions
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91.
Three phase overhead transmission line has its conductors horizontally spaced with spacing between adjacent conductors equals to d.  If now the conductors of the line are rearranged to form an equilateral triangle of sides equal to d. Then
(a) Average capacitance and inductance will increase
(b) Average capacitance will decrease and inductance will increase
(c) Average capacitance will increase and inductance will decrease
(d) Surge impedance loading of the line increases
Answer:

Option (c)

92.
Proximity of a line to the earth surface
(a) Does not affect its capacitance to neutral
(b) Increases the capacitance to neutral
(c) Decreases the capacitance to neutral
(d) None of above
Answer:

Option (b)

93.
If the effect of earth is taken into account then, capacitance of line to ground
(a) Decreases
(b) Increases
(c) Remains unchanged
(d) Becomes infinite
Answer:

Option (b)

94.
Presence of earth in case of overhead lines
(a) Increases the capacitance
(b) Increases the inductance
(c) Decreases the capacitance and increases the inductance
(d) Does not affect any of the line constant
Answer:

Option (a)

95.
For equilateral spacing of conductors of untranspozed three phase line, has
(a) Balanced receiving end voltage and no communication interference
(b) Unbalanced receiving end voltage and no communication interference
(c) Balanced receiving end voltage and communication interference
(d) Unbalanced receiving end voltage and communication interference
Answer:

Option (c)

96.
Transmission lines are transposed to
(a) Reduce corona loss
(b) Reduce skin effect
(c) Prevent interference with telephone line
(d) Prevent short circuit between any two line
Answer:

Option (c)

97.
Transposition of transmission line is done to reduce
(a) Line losses
(b) Capacitive effect
(c) Disturbances to nearby communication lines
(d) Effect of Surge voltages induced on the line
Answer:

Option (c)

98.
Transposition of transmission line is done to
(a) Reduce line losses
(b) Reduce skin effect
(c) Balance line voltage drop
(d) Reduce corona
Answer:

Option (c)

99.
High Voltage transmission lines are transposed because then
(a) Corona loss can be minimized
(b) Computation of inductance becomes easy
(c) Voltage drop in the lines can be minimized
(d) Phase voltage imbalances can be minimized
Answer:

Option (d)

100.
Effect of capacitance can be neglected when the length of overhead transmission line does not exceed
(a) 20 km
(b) 60 km
(c) 120 km
(d) 300 km
Answer:

Option (b)

Showing 91 to 100 out of 103 Questions
6 7 8 9 10 11