1
GATE EE 1996
MCQ (Single Correct Answer)
+1
-0.3
Keeping in view the requirement of parallel operation, which of the $$3$$-phase connections given below are possible?
A
delta-delta to delta-star
B
delta-delta to star-delta
C
star-star to delta-star
D
delta-star to star-delta
2
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 __________.
Your input ____
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 1994
MCQ (Single Correct Answer)
+1
-0.3
When a transformers winding suffers a short-circuit, the adjoining turns of the same winding experience
A
an attractive force
B
a repulsive force
C
no force
D
none of the above
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