1
GATE EE 2016 Set 2
MCQ (Single Correct Answer)
+2
-0.6
Three single-phase transformers are connected to form a delta-star three-phase transformer of 110 kV/ 11 kV. The transformer supplies at 11 kV a load of 8 MW at 0.8 p.f. lagging to a nearby plant. Neglect the transformer losses. The ratio of phase currents in delta side to star side is
A
1 : 10$$\sqrt 3 $$
B
10$$\sqrt 3 $$ : 1
C
1 : 10
D
$$\sqrt 3 $$ : 10
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 ________.
Your input ____
3
GATE EE 2016 Set 1
MCQ (Single Correct Answer)
+2
-0.6
If the star side of the star-delta transformer shown in the figure is excited by a negative sequence voltage, then GATE EE 2016 Set 1 Electrical Machines - Transformers Question 70 English
A
VAB leads Vab by 60º
B
VAB lags Vab by 60º
C
VAB leads Vab by 30º
D
VAB lags Vab by 30º
4
GATE EE 2016 Set 1
MCQ (Single Correct Answer)
+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
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