An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist: R > XC R = XC R < XC R = 5XC TRUE ANSWER : ? YOUR ANSWER : ?
The complex number 6 + j6 is equivalent to 3645° 8.4890° 645° 8.4845° TRUE ANSWER : ? YOUR ANSWER : ?
In a series RC circuit, when the frequency and the resistance are halved, the impedance is reduced to one-fourth is halved doubles cannot be determined without values TRUE ANSWER : ? YOUR ANSWER : ?
The complex number 40 angle 55° is equivalent to 45.88 + j65.52 22.94 + j32.76 55 + j55 40 + j40 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 = 47Ω + j150Ω Z = 103Ω TRUE ANSWER : ? YOUR ANSWER : ?
A positive angle of 30° is equivalent to a negative angle of –180° –60° –30° –330° 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 84.5 mW 845 mW 13 mW 130 mW TRUE ANSWER : ? YOUR ANSWER : ?
The voltages in Problem 4 are measured at a certain frequency. To make the capacitor voltage greater than the resistor voltage, the frequency must be increased must be decreased has no effect is held constant TRUE ANSWER : ? YOUR ANSWER : ?
In a parallel RC circuit, there is 100 mA through the resistive branch and 100 mA through the capacitive branch. The total rms current is 200 mA 100 mA 282 mA 141 mA TRUE ANSWER : ? YOUR ANSWER : ?
When the frequency of the source voltage decreases, the impedance of a parallel RC circuit increases decreases decreases to zero does not change TRUE ANSWER : ? YOUR ANSWER : ?