11. A capacitor with 150 Ω of capacitive reactance is across an ac source. The impedance, expressed in polar form, is ________.
(a) Z = 150
(b) Z = 150 ∠90° Ω
(c) Z = 150 ∠–90° Ω
(d) Z = 150 ∠180° Ω
12. What is the angular difference between +j4 and -j4?
(a) 30°
(b) 90°
(c) 180°
(d) 270°
13. The complex number 6 + j6 is equivalent to ________.
(a) 6 ∠45°
(b) 36 ∠45°
(c) 8.48 ∠45°
(d) 8.48 ∠90°
14. The complex number 40 ∠55° is equivalent to ________.
(a) 55 + j55
(b) 40 + j40
(c) 45.88 + j65.52
(d) 22.94 + j32.76
15. In the complex plane, the number 4 + j3 is located in the ________.
(a) first quadrant
(b) second quadrant
(c) third quadrant
(d) fourth quadrant
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