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GATE EE 2021 : Electrical Machines Quiz 6

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Question 1

Two 40 kVA single phase transformer are connected in open delta to supply a 230 V balanced 3-phase load. What is the total load that can be supplied without overloading either transformer?

Question 2

A 230/2300 V, Y/Δ, 3-phase transformer is rated at 230 KVA. Its rated secondary current/phase is

Question 3

The 3-ɸ transformer connection is shown below in figure. Calculate the secondary line current?

Question 4

A 3- transformer has its primary connected in delta and secondary in star. Secondary to primary turns ratio per phase is k. If the ratio of secondary to primary line voltage is k1, then k1=x k, the value of x is______.

Question 5

Two transformers with leakage impedance Z1 = 0.1 + j0.4 ohm and Z2 = 0.05 + j0.2 ohm are connected in parallel. The ratio of loads shared will be:

Question 6

Two transformers are to be operated in parallel such that they share load in proportion to their kVA ratings. The rating of the first transformer is 1000 kVA ratings. The rating of the first transformer is 1000 kVA and its pu leakage impedance is 0.08 pu. If the rating of second transformer is 350 kVA, its pu leakage impedance is
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Oct 9ESE & GATE EE