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GATE 2019: Power System Test 1

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Question 1

Calculate the charging current of a 164KV, 60 Hz transmission line with total shunt capacitance per phase of 8μF.

Question 2

Find the total number of strands in a ACSR conductor if the given number of layers is 5

Question 3

A transmission line having a reactance of 3 pu is operating at

3 pu. The generator is connected at source end which is delivering 2 pu of active power. Find the load angle?

Question 4

Consider the model shown in the following figure, of a transmission line with a series capacitor at its mid-point. The maximum voltage on the line is at the location

Question 5

Consider a HVDC link which uses thyristor-based line-commutated converters as shown in the figure. For a power flow of 750 MW from System 1 to System 2, the voltages at the two ends and the current, are given by : V₁ = 500 kV, V₂ = 485 kV and I = 1.5 kA. If the direction of power flow is to be reversed (that is, from System 2 to System 1) without changing the electrical connections, then which one of the following combinations is feasible?

Question 6

A load is supplied by a 230 V, 50 Hz source. The active power P and the reactive power Q consumed by the load are such that 1 kW P

2kW and 1kVAR

kVAR. A capacitor connected across the load for power factor correction generates 1 kVAR reactive power. The worst case power factor after power factor correction is

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ESE & GATE EE Power Systems

Sep 16ESE & GATE EE