Exam Questions Papers - Engineering

Q1:

The current i(t) through a 10 Ω resistor in series with an inductance is given by i(t) = 3 + 4 sin (100t + 45°) + 4 sin (300t + 60°) Amperes. The RMS value of the current and the power dissipated in the circuit are

A
41 A, 410 W respectively

B
35 A, 350 W respectively

C 5 A, 250 W respectively

D 11 A, 1210 W respectively

ANS:C - 5 A, 250 W respectively

Power = I2R = 25 X 10 = 250 Watts.