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GATE 2023 Power systems Quiz 46

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Question 1

Which of the following statements is/are correct?

1) In radial system, separate feeders radiate from a single substation and feed the distributors at one end only

2) In ring main system, the arrangement is similar to two feeders in parallel on different routes.

Question 2

A uniformly distributed dc two wire distributor 100 m long is loaded at 1A/m. Go and return resistance of the loop is 0.05Ω/km. if the distributor is feed at both ends at the same voltage. The maximum voltage drop is _______ mV.

Question 3

Which of the following statement is NOT correct?

Question 4

Why is ring main distribution system preferred to a radial system?

1) Voltage drop in the feeder is less

2) Power factor is higher

3) Supply is more reliable

Select the correct answer using the codes given below:

Question 5

A distribution feeder of 1 km length having resistance, but negligible reactance, is fed from both the ends by 400V, 50 Hz balanced sources. Both voltage sources S1 and S2 are in phase. The feeder supplies concentrated loads of unity power factor as shown in the figure.

The contributions of Si and S2 in 100 A current supplied at location P respectively, are______?

Question 6

Consider a DC distributor a b c d e f in the ring main is fed from one source at 150 V and load is shown in figure. Find the minimum potential in the ring main? Resistance of the feeder is 0.2 Ω/km.

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