A 470Ω resistor and a 200 mH coil are in parallel. Both components are across a 1.5 kHz ac source. The total admittance of the circuit, in polar form, is 12.18 angle –76° mS 12.18 angle 76° mS 12.60 angle –76° mS 218 angle –76° mS TRUE ANSWER : ? YOUR ANSWER : ?
A 47Ω resistor is in series with an inductive reactance of 120Ω across an ac source. The impedance, expressed in polar form, is 129 angle 31.4° 129 angle 68.6° 47 angle 68.6° 120 angle 68.6° TRUE ANSWER : ? YOUR ANSWER : ?
A 140Ω resistor is in parallel with an inductor having 60 inductive reactance. Both components are across a 12 V ac source. The magnitude of the total impedance is 5.51Ω 200Ω 55.15Ω 90Ω TRUE ANSWER : ? YOUR ANSWER : ?
When the frequency of the voltage applied to a series RL circuit is decreased, the impedance does not change cannot be determined without values increases decreases TRUE ANSWER : ? YOUR ANSWER : ?
Referring to Problem 23, the reactive power is 10 mVAR 148 mVAR 100 mVAR 6.76 mVAR TRUE ANSWER : ? YOUR ANSWER : ?
When the frequency of the voltage applied to a series RL circuit is increased, the phase angle decreases cannot be determined without values increases does not change TRUE ANSWER : ? YOUR ANSWER : ?
A 3.3 kΩ resistor and a 120 mH coil are in parallel. Both components are across a 2 kHz, 12 V ac source. The total current in the circuit is 874 A 874 mA 8.74 A 8.74 mA TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following power factors results in less energy loss in an RL circuit? 1 0.8 0.4 0.2 TRUE ANSWER : ? YOUR ANSWER : ?
A 1.5 kΩ resistor and a coil with a 2.2 kΩ inductive reactance are in series across an 18 V ac source. The power factor is 0.564 55.7 6.76 564 TRUE ANSWER : ? YOUR ANSWER : ?
In a parallel RL circuit, there are 3 A rms in the resistive branch and 3 A rms in the inductive branch. The total rms current is 6 A 4.24 A 424 mA 42.4 A TRUE ANSWER : ? YOUR ANSWER : ?