1
GATE EE 1996
+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
2
GATE EE 1996
+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
3
GATE EE 1996
+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 1996
+1
-0.3
If v, w, q stand for voltage, energy and charge, then v can be expressed
A
$$v=\frac{dq}{dw}$$
B
$$v=\frac{dw}{dq}$$
C
$$dv=\frac{dw}{dq}$$
D
$$dv=\frac{dq}{dw}$$
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