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 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
4
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
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