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Question 1

A 50 kV surge is propagating from a overhead line of surge impedance 100 Ω into a cable of surge impedance 20 Ω. The coefficient of current reflection at the junction of overhead line and cable is

Question 2

Consider a step voltage wave of magnitude 1p.u travelling along a lossless transmission line that terminates in a reactor. The voltage magnitude across the reactor at the instant the travelling wave reaches the reactor is

Question 3

The time take by a surge to travel to the end of 1200 km long overhead transmission line is ______?

Question 4

Which of the following is the nature of surge impedance in a transmission line?

Question 5

The generalised circuit constants of a 121 kV line are –

A = D= 0.96 0.5°

B = 80.0 75° Ω

C = 4 × 10-3 90° mho

What is surge impedance |Zs| of line is?

Question 6

For a Long transmission line, a single circuit 50 Hz, 3 phase transmission line has the following parameter per km, R=0.1 Ω, L= 0.8 mH, C=0.01 µF. The voltage at receiving end is 11 kV. The incidence voltage to neutral at the receiving end with the line is open at receiving end is_____?

Question 7

If a line of surge impedance Z0 is terminated in an impedance Z then the reflection for current and voltage surges at the termination are given respectively by

Question 8

Two long overhead transmission lines A and B having surge impedence of 450Ω and 430Ω respectively are connected by a short underground cable C of surge impedence 60Ω. A rectangular surge of 100kV and of infinite length travels along A towards the cable C Find the sum of the reflection coefficient at junction BC and refracted voltage at junction A, C …………..

Question 9

A 500 kV, 2 μsec Rectangular surge impedance of 350 Ω approaches a station at which the concentration earth capacitance is 3000 PF. Determine the maximum value of the transmitted wave______?

Question 10

what is the first impressed surge current into line-3 from following network.

(Given Z1 = 400 Ω, Z2 = 300 Ω and Z3 = 40 Ω)

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May 30ESE & GATE EE