1
GATE EE 2016 Set 1
+2
-0.6
If the star side of the star-delta transformer shown in the figure is excited by a negative sequence voltage, then
A
B
VAB lags Vab by 60º
C
D
VAB lags Vab by 30º
2
GATE EE 2016 Set 1
Numerical
+2
-0
A single-phase 400 V, 50 Hz transformer has an iron loss of 5000 W at the condition. When operated at 200 V, 25 Hz, the iron loss is 2000 W. When operated at 416 V, 52 Hz, the value of the hysteresis loss divided by the eddy current loss is ________.
3
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 _______.
4
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$$\angle30^\circ$$
EXAM MAP
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