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 564 0.564 55.7 6.76 TRUE ANSWER : ? YOUR ANSWER : ?
When the frequency is decreased, the impedance of a parallel RL circuit is not a factor remains constant decreases increases TRUE ANSWER : ? YOUR ANSWER : ?
When the resistor voltage in a series RL circuit becomes less than the inductor voltage, the phase angle decreases increases cannot be determined is not affected TRUE ANSWER : ? YOUR ANSWER : ?
To increase the current in a series RL circuit, the frequency should be increased should be constant cannot be determined without values should be decreased 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 47 angle 68.6° 129 angle 68.6° 129 angle 31.4° 120 angle 68.6° 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 8.74 mA 8.74 A 874 mA TRUE ANSWER : ? YOUR ANSWER : ?
If the frequency is halved and the resistance is doubled, the impedance of a series RL circuit remains constant doubles halves cannot be determined without values TRUE ANSWER : ? YOUR ANSWER : ?
A 470Ω resistor and a coil with 125Ω inductive reactance are in parallel. Both components are across a 15 V ac voltage source. Current through the inductor is 32 mA 120 mA 12 mA 152 mA TRUE ANSWER : ? YOUR ANSWER : ?
When the frequency of the voltage applied to a series RL circuit is decreased, the impedance decreases increases does not change cannot be determined without values 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 not a factor increased doubled decreased TRUE ANSWER : ? YOUR ANSWER : ?