64.  Scott connections are used for
A. single-phase to three-phase transformation
B. three-phase to single-phase transformation
C. three-phase to three-phase & two-phase transformations
D. any of the above

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65. In Scott connections, the neutral point divides the teaser winding in the ratio
A.13
B.12
C.11
D.14

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66. The secondary line voltage is maximum for which of the following connection?
A. delta-delta
B. star-star
C. delta-star
D. star-delta

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67. Three units of 15 transformers are connected in A?V to supply a 3-phase load from a 400 V. 3. source. The line voltage on the load side is
A. 1000 V
B. 80 V
C. 3464 V
D. 803 V

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68. The secondary of a PT is generally designed for
A. 220 V
B. 110 V
C. 150V
D. 11 V

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69. The secondary of a CT is generally designed for
A. 100 A
B. 10 A
C. 5 A
D. 0.5 A

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70. The maximum efficiency of a 100 kVA transformer having iron loss of 900 kW and F.L. Cu loss of 1600 W occurs at
A. 56.3 kVA
B. 133.3 kVA
C. 75 kVA
D. 177.7 kVA

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