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 more

(d) XL– XC> R

3. What is the average value of a.c. over a half cycle :

(a) zero

(b) I_{0} π

(c) 2I_{0 }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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