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GATE 2019: Power System Test 2
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Question 1
An ACSR conductor is made up of 30 aluminium strands and 19 steel strands. The conductor is denoted as:
Question 2
If C1 is annual interest and depreciation an capital cost of conductor and C2 is annual cost of energy loss then according to kelvin’s law relation between C1 and C2 is :
Question 3
A 3 set insulator string as shown in below figure. In this, m = 5 and the voltage across insulator away from conductor is 10 kV. The string efficiency is ________%.
Question 4
A three-phase cable is supplying 800kW and 600kVAr to an inductive load, it is intended to supply an additional resistive load of 100kW through the same cable without increasing the heat dissipation in the cable, by providing a three-phase bank of capacitors connected in star across the load. Given the line voltage is 3.3kV, 50Hz, the capacitance per phase of the bank, expressed in microfarads, is----------------
Question 5
The insulation resistance of a single core cable is 495 MΩ per km. If the core diameter is 2.5 cm and resistivity of insulation is 4.5 x 1014 Ohm-cm, the insulation thickness is _________ cm.
Question 6
A surge of 15 kV magnitude travels along a cable towards its junction with an overhead line. The inductance and capacitance of the cable and overhead line are respectively 0.3 mH, 0.4 μF and 1.5 mH, 0.012 μF per km. The voltage rise at the junction due to the surge is
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Sep 7ESE & GATE EE
