Transmission and Distribution MCQs | Transmission and Distribution Multiple Choice Questions and Answers

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Questions
1 The topmost conductor in hv transmission line is
A B-phase conductor
B Y- phase conductor
C R- phase conductor
D Earth conductor

Answer: Earth conductor
2 Insulators used on EHT transmission lines are
A PVC
B Glass
C Stealite
D Porcelain

Answer: Porcelain
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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

Answer: 30 kV/cm
4 HV transmission line uses
A Pine type insulators
B Suspension insulators
C Both (a) and (b)
D None of the above

Answer: Both (a) and (b)
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

Answer: 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)

Answer: 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

Answer: 1 and 3 only
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.

Answer: 0.01 F.
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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