1
GATE EE 2016 Set 1
+2
-0.6
A single-phase, 22 kVA, 2200 V/220 V, 50 Hz, distribution transformer is to be connected as an autotransformer to get an output voltage of 2420 V. Its maximum kVA rating as an auto-transformer is
A
22
B
24.2
C
242
D
2420
2
GATE EE 2015 Set 2
Numerical
+2
-0
Two three-phase transformers are realized using single-phase transformers as shown in the figure. The phase difference (in degree) between voltages V1 and V2 is _______.
3
GATE EE 2015 Set 2
+2
-0.6
A balanced (positive sequence) three-phase AC voltage source is connected to a balanced, star connected load through a star-delta transformer as shown in the figure. The line-to-line voltage rating is 230 V on the star side, and 115 V on the delta side. If the magnetizing current is neglected and $${\overline{\mathrm I}}_\mathrm s=100\angle0^\circ$$, then what is the value of $${\overline{\mathrm I}}_\mathrm p$$ in Ampere?
A
50$$\angle30^\circ$$
B
50$$\angle-30^\circ$$
C
50$$\sqrt3\angle30^\circ$$
D
200$$\angle30^\circ$$
4
GATE EE 2015 Set 2
+2
-0.6
A three-winding transformer is connected to an AC voltage source as shown in the figure. The number of turns are as follows: N1=100, N2=50, N3=50. If the magnetizing current is neglected, and the currents in two windings are $${\overline I}_2=2\angle30^\circ$$ A and $${\overline I}_3=2\angle30^\circ$$ A, then what is the value of the current $${\overline I}_1$$ in Ampere?
A
$$1\angle90^\circ$$
B
$$1\angle270^\circ$$
C
$$4\angle90^\circ$$
D
$$4\angle270^\circ$$
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