11. The phasor combination of resistive power and reactive power is called :

(a) true power

(b) apparent power

(c) reactive power

(d) average power

12. For a certain load, the true power is 100 W and the reactive power is 100 power ?

(a) 200 VA

(b) 100 VA

(c) 141.4 VA

(d) 120 VA

13. If the phase angle θ is 450, what is the power factor ?

(a) cos 450

(b) sin 450

(c) tan 450

(d) none of these

14. A two element series circuit with an instantaneous current I – 4.24 sin (5000t + 450) A has a power of 180 watts and a power factor of 0.8 lagging. The inductance of the circuit must have the value :

(a) 3 H

(b) 0.3 H

(c) 3 mH

(d) 0.3 mH

15. Apparent power is expressed in :

(a) volt-amperes

(b) watts

(c) volt-amperes or watts

(d) VAR

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