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Capacitors - Technical MCQs

Q1:

What is the impedance of an ac RC parallel circuit if the resistance is 12 ohms and the capacitive reactance equals 5 ohms?

A 0.2 ohms

B 3.5 ohms

C 4.6 ohms

D 13 ohms

ANS:C - 4.6 ohms

Impedance Z in parallel RC circuit. 1/Z = √[(1/R^2)+(1/Xc)^2]. =√[(1/144)+(1/25)]=0 .21656. Z = 1/0.21656= 4.617ohm.