Author Question: The primary winding of an electric train transformer has 200 turns, and the secondary has 50 . If ... (Read 77 times)

fnuegbu · **on:** Jul 28, 2018

The primary winding of an electric train transformer has 200 turns, and the secondary has 50 . If the input voltage is 120 V(rms), what is the output voltage?
a. 30 V
c. 10 V
b. 15 V
d. 480 V

Question 2

The intensity level of sound 30 m from a jet airliner is 120 dB. At what distance from the airplane will the sound intensity level be a tolerable 100 dB? (Assume spherical spreading of sound.)
a. 60 m
c. 300 m
b. 90 m
d. 400 m