A 1.2 kΩ resistor is in series with a 15 mH coil across a 10 kHz ac source. The magnitude of the total impedance is 942Ω 152.6Ω 1200Ω 1526Ω TRUE ANSWER : ? YOUR ANSWER : ?
When the frequency is decreased, the impedance of a parallel RL circuit is not a factor remains constant increases decreases TRUE ANSWER : ? YOUR ANSWER : ?
If a load is purely inductive and the reactive power is 12 VAR, the apparent power is 6 VA 12 VA 0 VA 24 VA 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 120 angle 68.6° 129 angle 31.4° 129 angle 68.6° 47 angle 68.6° TRUE ANSWER : ? YOUR ANSWER : ?
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 12.60 angle –76° mS 218 angle –76° mS 12.18 angle –76° mS TRUE ANSWER : ? YOUR ANSWER : ?
When the frequency of the voltage applied to a series RL circuit is increased, the phase angle cannot be determined without values decreases increases does not change TRUE ANSWER : ? YOUR ANSWER : ?
Referring to Problem 23, the reactive power is 100 mVAR 6.76 mVAR 10 mVAR 148 mVAR TRUE ANSWER : ? YOUR ANSWER : ?
The voltages in Problem 5 are measured at a certain frequency. To make the resistor voltage less than the inductor voltage, the frequency is increased decreased not a factor doubled 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 8.74 mA 874 A 874 mA 8.74 A TRUE ANSWER : ? YOUR ANSWER : ?
When the frequency of the voltage applied to a series RL circuit is decreased, the impedance increases decreases does not change cannot be determined without values TRUE ANSWER : ? YOUR ANSWER : ?