GATE 2019: Power System Test 5

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Question 1

If X is the inductive reactance/phase and R is the resistance/phase of a short transmission line, what is the power factor angle of the load for maximum voltage regulation?

• A
• B
• C
• D

Question 2

A 800 kV transmission line is having per phase line inductance of 1.1 mH/km and per phase line capacitance of 11.68 nF/km. Ignoring the length of line, its ideal power transfer capability in MW is

• A1204 MW
• B1504MW
• C2085 MW
• D2606 MW

Question 3

The generalized circuit constants of a 3-phase, 220 kV rated voltage, Moderatelength transmission line are
A = D = 0.936 + j0.016 = 0.936
B = 33.5 + j138 = 142.0
C = (–5.18 + j914)
If the load at the receiving end is 50 MW at 220 kV with a power factor of 0.9 lagging, the magnitude of line to lien sending and voltage should be

• A133.23 kV
• B220.00 kV
• C230.79 kV
• D246.30 kV

Question 4

For a single circuit transmission line delivering a load of 50 MVA at 110 KV and pf 0.8 lagging.
Given and
The sending end line voltage is ______kV.

• A111.12
• B234.33
• C123.34
• D152.47

Question 5

In a string of three identical suspension insulator units supporting a transmission line conductor, if the self-capacitance of each unit is denoted as C farads, the capacitance of each connector pin to ground can be taken as 0.1 C farads. If the maximum permissible voltage per unit is given as 20 KV then the string efficiency is

• A80.12 %
• B86.67 %
• C91.01 %
• D89.12 %

Question 6

A single phase transmission line and a telephone line are both symmetrically strung one below the other, in horizontal configurations, on a common tower. The shortest and longest distances between the phase and telephone conductors are 2.5 m and 3 m respectively. The voltage (volt/km) induced in the telephone circuit, due to 50 Hz current of 100 amps in the power circuit is

• A4.81
• B3.56
• C2.29
• D1.27

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