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GATE EE 2021 : Power System Quiz 2 (App update required to attempt this test)
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Question 1
Determine the most economic over all diameter (in cm) of a 1-core cable metal sheathed for a working voltage of 220 kV if the dielectric strength of insulating material is 170 kV/cm.
Question 2
In a three unit insulator sting, voltage across the lowest unit is 16.5kV and string efficiency is 85%. The total voltage across the string will be equal to ______ in V
Question 3
If 
for three-phase transmission line and reactance is 15 Ω/phase, then the power transmission per phase would be:
for three-phase transmission line and reactance is 15 Ω/phase, then the power transmission per phase would be:Question 4
In a transmission line each conductor is at 25 kV and is suspended by a string of two similar insulators. The ratio of shunt capacitance to mutual capacitance is 0.2. A guard ring effective only over the line-end insulator unit is fitted so that the voltage distribution becomes equal find out the value of capacitance CA as shown in figure below-
(Given C = 10μF)
Question 5
A 200 Km, 3-phase, 50 Hz transmission line has the following data :
, 
The sending end voltage is 280 kV. Then the charging current when load is disconnected is:
Question 6
A single core lead covered cable is to design for 66 kV to each. Its conductor radius is 0.6 cm and its three insulating material A, B and C have relative permittivity’s of 3, 2, 4 with maximum permissible stress of 50, 30 and 40 kV/cm respectively. Determine the minimum interval diameter of lead?
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Sep 10ESE & GATE EE
