AC Circuits » Exercise – 1
1. The capacitor reactance of a capacitor in d.c. circuit in ohms is :
(a) 1C ω
(b) ωC
(c) zero
(d) ω
2. In a series LRC circuit, resonance occurs when :
(a) R = XL~ XC
(b) XL= XC
(c) XL= 10 XC
(d) XL– XC> R
3. What is the average value of a.c. over a half cycle :
(a) zero
(b) I0 π
(c) 2I0 π
(d) none of these
4. In an AC circuit having R and L in series :
(a) voltage leads current
(b) current leads voltage
(c) voltage and current are increase
(d) voltage and current are in opposite phase
5. Average power in a pure inductive circuit is :
(a) irms × vrms
(b) 2 irms × vrms
(c) 1
(d) zero
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