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Alternating Current – 1 – 1

1. The capacitor reactance of a capacitor in d.c. circuit in ohms is :

(a) 1C ω
(b) ωC
(c) zero
(d) ω

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

(a) zero
(b) I0 π
(c) 2Iπ 
(d) none of these

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

5. Average power in a pure inductive circuit is :

(a) irms × vrms
(b) 2 irms × vrms
(c) 1
(d) zero

ANSWER

EXPLANATION

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