Star-Star Connection in Three Phase Transformer - MCQs with Answers
Star-Star Connection in Three Phase Transformer - MCQs with Answers
Q1. For the star-star connection of three phase transformer, the phase angle between the phase voltages and line voltages on both primary and secondary side isa. 0 degree
b. 30 degree
c. 60 degree
d. 120 degree
View Answer / Hide AnswerQ2. While connecting three phase transformer in star-star connection, the terminals of secondaries are wrongly joined. Then the mutual phase angle and magnitude of line to line voltages of secondaries willa. Equal to 120 degree and equal as before
b. Not equal to 120 degree and different
c. Equal to 120 degree and different
d. None of these
View Answer / Hide AnswerANSWER: b. Not equal to 120 degree and different
a. Δ - Δ to Y - Y
b. Y - Δ to Δ - Y
c. Y - Y to Y - Y
d. None of these
View Answer / Hide AnswerQ4. Due to presence of third harmonic component in the star-star connection of three phase transformer, the frequency of the circuit component becomesa. Three times of the circuit frequency
b. One third of the circuit frequency
c. Remains same
d. None of these
View Answer / Hide AnswerANSWER: a. Three times of the circuit frequency
a. V
L / √
3 , I
Lb. V
L , I
Lc. √
3V
L , I
L / √
3d. V
L, I
L / √
3View Answer / Hide AnswerQ6. The phase shift in a star-star connected three phase transformer isa. 0 degree
b. 30 degree
c. 60 degree
d. 120 degree
View Answer / Hide Answer
