A 12 kΩ resistor is in series with a 90 mH coil across an 8 kHz ac source. Current flow in the circuit, expressed in polar form, is I = 0.3 angle 0° mA. The source voltage, expressed in polar form, is 13.84 angle 69.4° V 12.8 angle 20.6° V 0.3 angle 20.6° V 3.84 angle 20.6° V 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 : ?
Which of the following power factors results in less energy loss in an RL circuit? 1 0.8 0.2 0.4 TRUE ANSWER : ? YOUR ANSWER : ?
When the resistor voltage in a series RL circuit becomes less than the inductor voltage, the phase angle decreases is not affected cannot be determined increases 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 68.6° 47 angle 68.6° 129 angle 31.4° 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 424 mA 6 A 42.4 A 4.24 A 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 1200Ω 152.6Ω 1526Ω 942Ω 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 12 mA 32 mA 152 mA 120 mA TRUE ANSWER : ? YOUR ANSWER : ?
If a load is purely inductive and the reactive power is 12 VAR, the apparent power is 24 VA 0 VA 6 VA 12 VA 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 26.0 V 2 V 20 V 18.4 V TRUE ANSWER : ? YOUR ANSWER : ?