1
GATE EE 2000
MCQ (Single Correct Answer)
+2
-0.6
A 3-phase delta/star transformer is supplied at 6000 V on the delta-connected side. The terminal voltage on the secondary side when supplying full load as 0.8 lagging power-factor is 415 V. The equivalent resistance and reactance drops for the transformer are 1% and 5% respectively. The turn's ratio of the transformer is:
A
14
B
24
C
42
D
20
2
GATE EE 1999
MCQ (Single Correct Answer)
+2
-0.6
A 10 kVA, 400 V/200 V, single phase transformer with a percentage resistance of 3% and percentage reactance of 6% is supplying a current of 50 A to a resistive load. The value of the load voltage is:
A
194 V
B
390 V
C
192 V
D
196 V
3
GATE EE 1999
MCQ (Single Correct Answer)
+2
-0.6
The percentage resistance and percentage reactance of a 10 kVA, 400 V/200 V, 3-phase transformer are 2% and 10% respectively. If the constant losses in the machine are 1%, the maximum possible percentage efficiency of the transformer is:
A
98.32
B
97.25
C
96.25
D
96.12
4
GATE EE 1999
MCQ (Single Correct Answer)
+2
-0.6
A 400V/100V, 10 kVA two-winding transformer is reconnected as an autotransformer across a suitable voltage source. The maximum rating of such an arrangement could be
A
50 kVA
B
15 kVA
C
12.5 kVA
D
8.75 kVA
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