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RC Circuits - Technical MCQs

Q1:

What is the effect of increasing the resistance in a series RC circuit?

A There will be no effect at all.

B The current will increase.

C The phase shift will decrease.

D The input voltage will increase.

ANS:C - The phase shift will decrease.

 Resonant freq will occur in rlc/lc ckt(f=1/2*pi*L*C) and moreover resonant freq will result only when impedance of the circuit is at its minimum in series ckt (Here the resistance is increased). arctan is inv(tan) or tan^-1.