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 8.74 A 874 mA TRUE ANSWER : ? YOUR ANSWER : ?
To increase the current in a series RL circuit, the frequency should be increased should be constant should be decreased cannot be determined without values TRUE ANSWER : ? YOUR ANSWER : ?
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 1526Ω 1200Ω 152.6Ω 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 564 6.76 55.7 0.564 TRUE ANSWER : ? YOUR ANSWER : ?
When the frequency is decreased, the impedance of a parallel RL circuit decreases increases remains constant is not a factor 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 decreased doubled not a factor increased TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following power factors results in less energy loss in an RL circuit? 1 0.4 0.8 0.2 TRUE ANSWER : ? YOUR ANSWER : ?
If a load is purely inductive and the reactive power is 12 VAR, the apparent power is 24 VA 6 VA 0 VA 12 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 129 angle 68.6° 47 angle 68.6° 120 angle 68.6° 129 angle 31.4° TRUE ANSWER : ? YOUR ANSWER : ?
In a series RL circuit, 12 V rms is measured across the resistor, and 14 V rms is measured across the inductor. The peak value of the source voltage is 2 V 18.4 V 20 V 26.0 V TRUE ANSWER : ? YOUR ANSWER : ?