Point +4 on the complex plane is 4 units below the origin on the j axis 4 units left of the origin on the real axis 4 units above the origin on the j axis 4 units right of the origin on the real axis TRUE ANSWER : ? YOUR ANSWER : ?
A 12 kΩ resistor is in series with a 0.02 μF capacitor across a 1.2 kHz ac source. If the current is expressed in polar form as I = 0.3 angle 0° mA, what is the source voltage expressed in polar form? 45.6 V 0.411 V 4.11 V 411.3 V TRUE ANSWER : ? YOUR ANSWER : ?
A positive angle of 30° is equivalent to a negative angle of –30° –180° –60° –330° TRUE ANSWER : ? YOUR ANSWER : ?
What is the value of the hypotenuse of a right triangle whose sides are 12 and 18? 4.24 3.46 2.16 21.63 TRUE ANSWER : ? YOUR ANSWER : ?
When the frequency of the voltage applied to a series RC circuit is increased, the phase angle remains the same decreases increases becomes erratic TRUE ANSWER : ? YOUR ANSWER : ?
The complex number 6 + j6 is equivalent to 8.4845° 8.4890° 3645° 645° TRUE ANSWER : ? YOUR ANSWER : ?
A 2 k resistor is in series with a 0.015 F capacitor across a 15 kHz ac source. What is the magnitude of the total impedance and the phase angle? 2121 and θ = –19.5° 73.4 and θ = –19.5° 734 and θ = –38.9° 707 and θ = –19.5° TRUE ANSWER : ? YOUR ANSWER : ?
A 2 kΩ resistor and a 0.002 μF capacitor are in series across an ac source. Current in the circuit is 6.50 mA. The true power is 845 mW 130 mW 13 mW 84.5 mW TRUE ANSWER : ? YOUR ANSWER : ?
A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 k. Current flow in the circuit is 92 mA 9.2 mA 460 mA 4.6 mA TRUE ANSWER : ? YOUR ANSWER : ?
A 47Ω resistor and a capacitor with 150Ω of capacitive reactance are in series across an ac source. The impedance, expressed in rectangular form, is Z = 197Ω Z = 47Ω – j150Ω Z = 103Ω Z = 47Ω + j150Ω TRUE ANSWER : ? YOUR ANSWER : ?