1
GATE EE 1996
MCQ (Single Correct Answer)
+1
-0.3
Auto-transformer is used in transmission and distribution
A
when operator is not available
B
when iron losses are to be reduced
C
when efficiency considerations can be ignored
D
when the transformation ratio is small
2
GATE EE 1996
MCQ (Single Correct Answer)
+1
-0.3
The function of oil in a transformer is
A
to provide insulation and cooling
B
to provide protection against lightning
C
to provide protection against short circuit
D
to provide lubrication
3
GATE EE 1995
MCQ (Single Correct Answer)
+1
-0.3
Supply to one terminal of a $$\triangle$$ - Y connected three-phase core type transformer which is on no-load, fails. Assuming magnetic circuit symmetry, voltages on the secondary side will be:
A
230, 230, 115
B
230, 115, 115
C
345, 115, 115
D
345, 0, 345
4
GATE EE 1995
Numerical
+1
-0
The percentage impedance of a 100 kVA, 11 kV/400V, delta/wye, 50 Hz transformer is 4.5%. For the circulation of half the full load current during short circuit test, with low voltage terminals shorted, the applied voltage on the high voltage side will be __________.
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