1
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 72 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
2
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
3
GATE EE 2015 Set 1
Numerical
+2
-0
A 200/400 V, 50 Hz, two-winding transformer is rated at 20 kVA. Its windings are connected as an auto-transformer of rating 200/600 V. A resistive load of 12 Ω is connected to the high voltage (600 V) side of the auto-transformer. The value of equivalent load resistance (in Ohm) as seen from low voltage side is _____.
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4
GATE EE 2015 Set 1
Numerical
+2
-0
Two single-phase transformers T1 and T2 each rated at 500 kVA are operated in parallel. Percentage impedances of T1 and T2 are (1 + j6) and (0.8 + j4.8), respectively. To share a load of 1000 kVA at 0.8 lagging power factor, the contribution of T2 (in kVA) is ________.
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