6. The root mean square value of voltage (V) in an AC circuit is :

(a) 0.637Vmax

(b) 0.707 Vmax

(c) 2Vmax

(d) 2 Vmax

7. The power factor in AC circuit is equal to :

(a) Z/R

(b) R/Z

(c) RZ

(d) none of the

8. A series AC circuit has a resistance of 12 Ω and reactance 5 Ω. The impedance of circuit is :

(a) 5 Ω

(b) 12 Ω

(c) 13 Ω

(d) 17 Ω

9. In an AC series circuit, instantaneous voltage is maximum while instantaneous current is zero. The source is connected to :

(a) pure inductor only

(b) pure resistance only

(c) pure capacitor only

(d) (a) or (c)

10. If the mean value of an alternating voltage is (28 √2)/π volt, its rms value is :

(a) 28 volt

(b) 14 volt

(c) 142 volt

(d) zero

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