Q1. (8 points) (1) Which one is true about dc circuit? A. dc circuit has constant direction and alternating magnitude. B.dc circuit has alternating direction and constant magnitude. C.dc circuit has both constant direction and magnitude. D.dc circuit has both alternating direction and magnitude. (2) Which one is true about ac circuit? A. ac circuit has constant magnitude but. alternating direction. B. ac circuit has alternating magnitude but constant direction. C. ac circuit has both constant magnitude and direction. D. ac circuit has both alternating magnitude and alternating direct-ion. (3) Alternating current (AC) takes the following sinusoidal form I\") Z In sin(wt + 451'), which one of the following statement is true? A. the current is a function in w. B. In is the magnitude that represents the peak value. It is a scaling factor without unit. CM is the angular frequency with unit- rad/s Dni is the period that relates to w. (4) Which one of the following statements is true about reection. A. The angle of incidence is not always the same as the angle of reection. B. The angle of incidence is the always the same as the angle of reect-ion. C. The angle of incidence is always greater than the angle of reection. D. The angle of incidence is always smaller than the angle of reection. (5) Which one of the following statements is true about refraction. A. The angle of incidence is related to the angle of refraction by Snell's law. B. The angle of incidence is the always the same as the angle of refraction. C. The angle of refraction is always greater than the angle of incidence. D. The angle of refraction is always smaller than the angle of incidence. (6) Which one of the following equations describes Snell's law. (9a is the angle of incidence, 9b is the ang of refraction, 11a is the refractive index of media a where light incidents, m, is the refractive index of media I) whe. light is refracted.) Ana sin(6la) = 7% sinwb) ana sinwb) = no sin(9b) Cm, sin(3a) = m, sinwa) D.nb sin(6a) 2 na sin(9 2 (7) Which one of the following diagrams can be used as a phasor diagram to represent the following alternating current when t = 3s i(t) = 3sin (t+ ?) , A 8) Which one of the following diagrams can be used as a phasor diagram to represent the following alter- nating current when t = 0s i(t) = 3sin (at+ ? ), B C D Q2.(6 point) Evaluate the phase angle of voltage for the following LCR circuit, where the inductance L = 1H, the capacitance C = 1/24 F and resistance R = 20. The angular frequency of the signal generator is w = 6 rad/s. R Signal generatorQ3.(6 points)Determine the unknown angle in the diagram. surface 3 surface 2 surface 1 "all