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AC Fundamentals – 1 – 3

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

(a) true power
(b) apparent power
(c) reactive power
(d) average power

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

15. Apparent power is expressed in :

(a) volt-amperes
(b) watts
(c) volt-amperes or watts
(d) VAR

ANSWER

EXPLANATION

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