THIS IS AC COURSE QUESTION Choose the correct answers for th

THIS IS AC COURSE QUESTION

Choose the correct answers for the following questions. A pass-band filter has _________ cutoff frequency(ies). 0 1 2 3 At a low -pass filter\'s cutoff frequency. V_out = V_in V_out = 0.707V_in V_out = 0.5V_in V_out = 0 Which of the followings is NOT a transformer\'s function? stepping up voltage isolating a circuit electrically matching a impedance changing AC current to DC current. A neutral wire may be found in a _________ three-phase Y connection circuit. three-phase delta connection circuit. filter circuit. All the circuits in a. to c. The phase angle between any two phase voltages in a three-phase generator is 0 degree. 90 degrees. 120 degrees. 180 degrees. A transformer has 400 turns in primary winding and 80 turns in secondary winding. If the voltage applied to the primary is 120 volts and 60 Hz, calculate the secondary voltage. the magnetic flux in the transformer core.

Solution

1 Ans: C. 2 cut off frequencies

2 Ans: B. V₀ = 0.707 V_in

3 Ans: D. Transformer does not convert AC into DC

4 Ans: D Neutral wire can find in all the above circuits

5 Ans: C 120⁰ phase angle between any two phase voltages in a three-phase generator.