Transmission Line Multiple Choice Questions with Answers

Questions

61 Series capacitors on transmission lines are of little use when the load VAR requirement is

A Large

B Small

C Fluctuating

D All of the above

View Answer

Answer: Small

62 The lines having R, L, C distributed along the circuit are called

A Lumped

B Distributed

C Parallel

D Paired

View Answer

Answer: Distributed

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63 Which primary parameter is uniformly distributed along the length of the conductor?

A G

B C

C L

D R

View Answer

Answer: R

64 The primary parameter that is associated with the electric charges is

A G

B R

C C

D Any of the above

View Answer

Answer: C

65 The characteristic impedance of a transmission line with impedance and admittance of 16 and 9 respectively is

A 25

B 1.33

C 7

D 0.75

View Answer

Answer: 1.33

66 When a transmission line has a load impedance same as that of the characteristic impedance, the line is said to be

A Parallel

B Perpendicular

C Polarized

D Matched

View Answer

Answer: Matched

67 Length of long transmission line is more than ___________

A 80 Km

B 50 Km

C 120 Km

D 200 Km

View Answer

Answer: 200 Km

68 Range of surge impedance for an overhead transmission line is ____________

A 12 Ω – 144 Ω

B 40 Ω – 60 Ω

C 400 Ω – 600 Ω

D 300 Ω – 900 Ω

View Answer

Answer: 400 Ω – 600 Ω

69 Synchronous phase modifiers are installed at which of the following position of the transmission line?

A Reciving end

B Sending end

C Between reciving end and sending end

D Near reciving end

View Answer

Answer: Sending end

70 What is the value of characteristics impedance for loss free transmission line?

A √(L/C)

B √(R/C)

C √(LC)

D √(C/L)

View Answer

Answer: √(L/C)

71 The leakage current through the shunt admittance is __________

A Maximum at sending end

B Maximum at receiving end

C Uniform over length of line

D Maximum at centre of line

View Answer

Answer: Maximum at sending end

72 The bundling of conductors is done primarily to

A reduce reactance

B increase reactance

C increase ratio interference

D reduce radio interference

View Answer

Answer: reduce reactance

73 For a distortion-less transmission line (G = shunt conductance between two wires)

A R/L = G/C

B RL=GC

C RG=LC

D any of the above

View Answer

Answer: R/L = G/C

74 A relay used on long transmission lines is

A mho's relay

B reactance relay

C impedance relay

D All of the above

View Answer

Answer: mho's relay

75 Total load transmitted through a 3 phase transmission line is 10,000 kW at 0.8 power factor lagging. The I2R losses are 900 kW. The efficiency of transmission line is

A 60%

B 90%

C 95%

D 99%

View Answer

Answer: 90%

76 The chances of corona are maximum during

A Summer Heat

B Winter

C Dry Weather

D Humid Weather

View Answer

Answer: Humid Weather

77 The power transmitted will be maximum when

A Sending end voltage is more

B Receiving end voltage is more

C Reactance is high

D Corona losses are least

View Answer

Answer: Sending end voltage is more

78 When two conductors each of radius r are at a distance D, the capacitance between the two is proportional to

A loge (D/r)

B loge (r/D)

C 1/loge (D/r)

D None of the above

View Answer

Answer: 1/loge (D/r)

79 Are the conductors, which connect the consumer’s terminals to the distribution

A Distributors

B Service mains

C Feeders

D None of the above

View Answer

Answer: Service mains

80 Overhead system can be designed for operation up to

A 11 kV

B 33 kV

C 66 kV

D All of the above

View Answer

Answer: 66 kV

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