Scott & Zig-Zag Connection in Three Phase Transformers - MCQs with Answers
Q1. Scott connection is used for the conversion of a. Single phase to three phase
b. Three phase to single phase
c. Single phase to two phase
d. All of these
View Answer / Hide AnswerANSWER: c. Single phase to two phase
Q2. In Scott connection, the voltage across the teaser leads the mains bya. 30 degree
b. 60 degree
c. 90 degree
d. 120 degree
View Answer / Hide AnswerQ3. In a single phase, full wave bridge circuit and in three phase, delta full wave bridge circuit, the ripple voltage frequency is alwaysa. Twice the line frequency, six times the line frequency
b. Both will be twice the line frequency
c. Both will be six times the lines frequency
d. None of these
View Answer / Hide AnswerANSWER: a. Twice the line frequency, six times the line frequency
Q4. Most familiar application of zig-zag transformer is as a. Ground reference on an ungrounded system
b. Converting single phase to two phase
c. Reducing harmonics
d. All of these
View Answer / Hide AnswerANSWER: a. Ground reference on an ungrounded system
Q5. In double delta transformation, a double delta refers to the case where there are two delta transformations ina. Parallel
b. Series
c. Both series and parallel
d. Neither series nor parallel
View Answer / Hide AnswerQ6. A differential relay comparator used for the protection of three phase transformers hasa. One comparator
b. Two comparator
c. Three comparator
d. Six comparator
View Answer / Hide AnswerANSWER: c. Three comparator