Transmission Line MCQs | Transmission Line Multiple Choice Questions and Answers

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Questions
1 Which of the following parameters is not a primary parameter?
A Resistance
B Attenuation constant
C Capacitance
D Conductance

Answer: Attenuation constant
2 The networks in which the R, L, C parameters are individually concentrated or lumped at discrete points in the circuit are called
A Lumped
B Distributed
C Parallel
D Paired

Answer: Lumped
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3 The leakage current in the transmission lines is referred to as the
A Resistance
B Radiation
C Conductance
D Polarisation

Answer: Conductance
4 Find the receiving impedance of a transmission line having a voltage of 24V and a conduction current of 1.2A is
A 25.2
B 22.8
C 28.8
D 20

Answer: 20
5 The propagation constant of a transmission line with impedance and admittance of 9 and 16 respectively is
A 25
B 144
C 12
D None of the above

Answer: 12
6 Find the characteristic impedance expression in terms of the inductance and capacitance parameters.
A Zo = √(LC)
B Zo = LC
C Zo = √(L/C)
D Zo = L/C

Answer: Zo = √(L/C)
7 In long transmission lines Resistance and Capacitance parameters of lines are connected in __________
A Series, shunt
B Series, series
C Shunt, shunt
D Shunt, parallel

Answer: Shunt, parallel
8 Range of surge impedance for an underground cables is _____________
A 12 Ω – 144 Ω
B 40 Ω – 60 Ω
C 400 Ω – 600 Ω
D 300 Ω – 900 Ω

Answer: 40 Ω – 60 Ω
9 The voltage rating of long transmission line is _________
A 20 KV to 100 KV
B Upto 20 KV
C Above 100 KV
D 60 KV to 80 KV

Answer: Above 100 KV
10 Which of the following regulation is considered to be the best
A 2%
B 30%
C 70%
D 98%

Answer: 2%
11 The characteristic impedance of a transmission line depends upon
A shape of the conductor
B surface treatment of the conductors
C conductivity of the material
D geometrical configuration. of the conductors

Answer: geometrical configuration. of the conductors
12 When the power is to be transmitted over a distance of 500 km, the transmission voltage should be in the range
A 150kV - 220kV
B 110 kV - 150 kV
C 66 kV - 100 kV
D 33 kV - 66 kV

Answer: 150kV - 220kV
13 In order to reduce skin effect at UHF
A conductors are painted
B conductors are anodized
C copper lubes with silver plating are used
D copper rods with silver plating are used

Answer: copper lubes with silver plating are used
14 Shunt capacitance is usually neglected in the analysis of
A Medium transmission lines
B Long transmission lines
C Medium as well as long transmission lines
D Short transmission lines

Answer: Short transmission lines
15 Neglecting losses in a transmission system, if the voltage is doubled, for the same power transmission, the weight of conductor material required will be
A four times
B double
C half
D one fourth

Answer: one fourth
16 By which of the following systems electric power may be transmitted ?
A Overhead system
B Underground system
C Both (a) and (b)
D None of the above

Answer: Both (a) and (b)
17 The underground system cannot be operated above
A 440 V
B 11 kV
C 33 kV
D 66 kV

Answer: 66 kV
18 The wooden poles well impregnated with creosite oil or any preservative compound have life
A from 2 to 5 years
B 10 to 15 years
C 25 to 30 years
D None of the above

Answer: 25 to 30 years
19 Galvanised steel wire is generally used as
A stay wire
B earth wire
C structural components
D all of the above

Answer: all of the above
20 The usual spans with R.C.C. poles are
A 40—50 meters
B 60—100 meters
C 80—100 meters
D 300—500 meters

Answer: 80—100 meters

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