Download Aptitude Crack
img not found img not found

Magnetism and Electromagnetism - Engineering

Q1:

A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?

A 90

B 180

C 270

D 360

ANS:B - 180

Nm = 90 * 60 = 5400 rev/min.
W=2π * Nm/60.

W= 2*3.14*5400/60 = 565 rad/second.
W= 2π*f.
F=W/2π.
F=565/2*3.14= 90,
Answer is 90.