AC Theory Lvl 2 Test

What is the voltage drop across Xl in the figure below if R = 1500 Ohms

60V 80V 90V 120V

What is the true power in the circuit in the figure below? Given; R = 350Ohms, Eapp = 24V, Z = 500Ohms, It = 48mA

120 milliwatts 202 milliwatts 474 milliwatts 806 milliwatts

What is the applied voltage for the circuit in the figure below? Given; 60 Hz, Er = 118V, Ec = 209V

120 volts 208 volts 240 volts 327 volts

What is the power factor for the circuit in the figure below? Given; R = 150Ohms, C = 10uF, Eapp = 120Volts, It = 393mA, 60Hz

20% 49% 59% 67%

What is the value of the capacitor in the figure below? Given (same values as previous question)

33.2uF 44.2uF 22.6uF 30.1uF

In a parallel RL circuit, the voltage across the inductor ____ the voltage across the resistor.

lags leads is in phase with is inversely proportional to

In general, when either the resistance or the inductive reactance in a circuit is ______ the other, the smaller value can be ignored.

half as much as ten times greater than three times as great as twice as great as

What is the total current for the circuit in the figure below? Given; R = 40 Ohms, Xl = 60 Ohms, Xc = 80 Ohms, Eapp = 120V, 60Hz

0.5A 3.0A 4.6A 6.5A

What is the capacitive reactance of a series RC circuit containing a 100uF and a 200uF capacitor when supplied by 500 Hertz power?

1.1 microohms 3.0 microohms 4.8 Ohms 5.2 Ohms

What is the total current for the circuit below? Given; R = 100 Ohms, Xl = 340 Ohms

1.25A 1.30A 1.79A 2.70A

What is the applied voltage of the circuit in the figure below? Given; R = 24Ohms, It = 3A, Xc = 80Ohms, Xl = 48Ohms

12V 120V 168V 240V

Calculate the total current for a parallel RLC circuit with the following values. Given; IL= 28A, Ic = 12A, Ir = 24A

17.9A 28.8A 34.9A 46.6A

What is the true power for a circuit with an applied voltage of 240V, a current draw of 16A, and a power factor of 87%?

2.8kW 3.34kW 3.84kW 4.4kW

What is the total current for the circuit in the figure below? Given; R = 150Ohms, C = 10uF, Eapp = 120Volts, 60Hz

393mA 787mA 1.07A 1.6A

What is the capacitive reactance of a circuit with 212 Ohms of inductive reactance at resonant frequency?

40 Ohms 80 Ohms 212 Ohms 316 Ohms

What is the power factor for the circuit in the figure below? Given; R = 250 Ohms L = 500 mH

66.3% 79.9% 87.6% 125.2%

What is the power factor for the circuit in the figure below? Given; It = 686mA, Ir = 500 mA. 120V 60Hz

73% 87% 91% 96.4%

Which of the following phase relationships is true for a parallel RLC circuit?

El and Ec are in phase El and Ec are 90 degrees out of phase El lags the current by 90 degrees Ec leads the voltage by 90 degrees

True power is dissipated by the _____ in a series LCR circuit.

capacitive reactance impedance inductive reactance resistance

If the frequency of an inductive, series LCR circuit is increased, which of the following is true?

capacitive reactance increases current increases impedance decreases power factor decreases

When analyzing a series RC circuit, ________ is used as the reference.

current reactance resistance voltage

If the frequency is increased in a series RL circuit, the current will ____

decrease increase increase proportionally with the frequency remain the same

If the frequency is increased in a parallel RL circuit, the impedance will ______

decrease increase remain the same vanish

What is the total current for the circuit in the figure below? GIven; Z = 250 Ohms, Et = 24V, Xc = 50 Ohms, Xl = 1500 Ohms

48 mA 57mA 61mA 96mA

Which figure below correctly shows the phase relationship between the current and voltage in a parallel RL circuit.

Figure A B C D