Electro Magnetic Induction And Alternating Currents Question 85

Question: A generator produces a voltage that is given by $ V=240\sin 120,t $ , where t is in seconds. The frequency and r.m.s. voltage are [MP PET 1993; MP PMT 1990]

Options:

A) 60 Hz and 240 V

B) 19 Hz and 120 V

C) 19 Hz and 170 V

D) 754 Hz and 70 V

Show Answer

Answer:

Correct Answer: C

Solution:

$ \nu =\frac{\omega }{2\pi }=\frac{120\times 7}{2\times 22}=19\ Hz $ $ {V_{r.m.s.}}=\frac{240}{\sqrt{2}}=120\sqrt{2}\approx 170\ V $



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