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Free download in PDF Transmission and Distribution Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
The topmost conductor in hv transmission line is
[A]
B-phase conductor
[B]
Y- phase conductor
[C]
R- phase conductor
[D]
Earth conductor
(2)
Insulators used on EHT transmission lines are
[A]
PVC
[B]
Glass
[C]
Stealite
[D]
Porcelain
(3)
The dielectric strength of air under normal conditions is around
[A]
30 kV/cm
[B]
150 kV/cm
[C]
100 kV /cm
[D]
200 kV/cm
(4)
HV transmission line uses
[A]
Pine type insulators
[B]
Suspension insulators
[C]
Both (a) and (b)
[D]
None of the above
(5)
Critical voltage limit of a transmission line is increased by
[A]
Reducing the radius of the conductors
[B]
Reducing the spacing between conductors
[C]
Increasing the spacing between conductors
[D]
Increasing the radius of the conductors
Answer: Increasing the radius of the conductors
(6)
Transmission line constants are
[A]
Capacitance
[B]
Inductance
[C]
Resistance
[D]
All of these
(7)
The inductance of line is minimum when
[A]
G M D is high
[B]
G M R is high
[C]
Both G M D and G M R are high
[D]
G M D is low but G M R is high
Answer: G M D is low but G M R is high
(8)
The inductance of single phase two wire power transmission line per km gets doubled when the
[A]
Radius of the wore is double
[B]
Distance between the wires is increased as square of the original distance
[C]
Distance between the wires is doubled
[D]
Distance between the wires is doubled
Answer: Distance between the wires is increased as square of the original distance
(9)
Compared with solid conductor of the same radius, corona appears on a stranded conductor at a lower voltage, because stranding
[A]
assists ionization
[B]
makes the current flow spirally about the axis of the conductor
[C]
produces oblique sections to a plane perpendicular to the axis of the conductor
[D]
produces surfaces of smaller radius
Answer: produces surfaces of smaller radius
(10)
High voltage transmission lines are transposed because then
[A]
Phase voltage imbalances can be minimized
[B]
Voltage drop in the lines can be minimized
[C]
Computations of inductance becomes easier
[D]
Corona losses can be minimized
Answer: Phase voltage imbalances can be minimized
(11)
Transposition of transmission line is done to
[A]
Reduce corona
[B]
Balance line voltage drop
[C]
Reduced skin effect
[D]
Reduce line loss
Answer: Balance line voltage drop
(12)
Increase in frequency of transmission line causes
[A]
No change in line resistance
[B]
Increases in line resistance
[C]
Decreases in line resistance
[D]
Decreases in line series reactance
Answer: Increases in line resistance
(13)
The 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 effect any of the line constants
Answer: Increases the capacitance
(14)
Skin effect in transmission line is due to
[A]
Supply frequency
[B]
Self inductance of conductor
[C]
High sensitivity of material in the centre
[D]
Both (a) and (b)
(15)
In a transmission line the distributed constants are
[A]
Resistance and shunt conductance only
[B]
Resistance and inductance only
[C]
Resistance, inductance and capacitance only
[D]
Resistance, inductance, capacitance and shunt conductance
Answer: Resistance, inductance, capacitance and shunt conductance.
(16)
The presence of earth in case of overhead lines
[A]
Increases the capacitance
[B]
Increases the inductance
[C]
Decreases the capacitance
[D]
Decreases the inductance
Answer: Increases the capacitance
(17)
Which of the following is neglected while analyzing a short transmission line?
[A]
Power losses
[B]
Shunt admittances
[C]
Series impedance
[D]
none of the above
Answer: Shunt admittances
(18)
Following effects are associated with transmission lines
1. Skin effect
2. Corona effect
3. Proximity effect
The effective resistance of conductor is increased by
[A]
1 only
[B]
2 and 3 only
[C]
1 and 3 only
[D]
None of the above
(19)
For 11 kV transmission line the capacitance per km will be about
[A]
0.01 F.
[B]
0.1 F.
[C]
0.1μF.
[D]
0.01μF.
(20)
Percentage regulation of transmission line is given by the expression
[A]
(VR - VS)/VR × 100
[B]
(VR - VS)/VS × 100
[C]
(VS - VR)/VR × 100
[D]
(VS - VR)/VS × 100
Answer: (VS - VR)/VR × 100
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