Unit 23, 24
62.27 ohms
An RLC series circuit has R = 56 Ω, XL = 64 Ω, and XC = 37 Ω. What is the value of Z?
7070 ohms
A parallel tank circuit operating at its resonant frequency has an impedance of 10,000 Ω. At the points on either side of the resonant frequency that define the bandwidth, the impedance is approximately _____.
40 percent
An RLC series circuit has an applied voltage of 240 volts. R = 48 Ω and the voltage across it is 96 V. What is the circuit power factor?
53.05 mf
An RLC series circuit is powered by a 120-V, 60-Hz supply. It contains a capacitor that has an XL of 50 Ω. What is the capacitance of the capacitor?
180 degrees
Because inductive reactance and capacitive reactance are _____ out of phase with each other, they subtract from each other in an AC circuit.
Lagging
If a RLC series circuit contains more inductive VARs than capacitive VARs, the circuit has a _____ power factor.
Leading
If the current leads the voltage in a RLC series circuit, the power factor is referred to as _____. lagging
paralell
To correct the power factor to 100 percent an equal amount of capacitive VARs would be connected in _____ with the motor.
Unity
If the power factor is corrected exactly so that the circuit is purely resistive, the power factor has a value of _____.
Leading
If the voltage is behind the current in a RLC series circuit, the power factor is referred to as _____.
Bandwidth
The difference between the two frequencies at which the current is 0.707 of the maximum current value is the _____.
Lagging
If a RLC parallel circuit contains more inductive VARs than capacitive VARs, the circuit has a _____ power factor.
Leading
If a RLC series circuit contains more capacitive VARs than inductive VARs, then the circuit has a _____ power factor.
Current; voltage
In a RLC series circuit, _____ is the same through all components and the _____ are out of phase.
Resonance
In a RLC series circuit, the point at which XL and XC are equal is called _____.
Bandwidth
In a parallel LC circuit, the difference in frequencies above and below resonance at which impedance is 0.707 of the maximum is called the _____ of the circuit.
Voltage
In an RLC series circuit, the ratio of resistance, inductance, and capacitance determines how much the applied _____ leads or lags the circuit current.
10,000
A parallel circuit at resonance has ITANK = 1.00 A, ILINE = 0.05 A, Q = 20, and a voltage across the tank of 500 V. What is the impedance of the tank?
89 ohms
An RLC parallel circuit has an applied voltage of 240 volts. R = 48 Ω, XL = 100 Ω, and XC = 36 Ω. What is the circuit impedance (Z)?
Q= iTank/iLine
For parallel resonant circuits, the correct formula relating ITANK, Q, and ILINE is _____.
Lagging
If the voltage in a RLC series circuit is ahead of the current, the power factor is referred to as _____. lagging leading
Voltage; currents
In an RLC parallel circuit, the _____ is the same through all components and the _____ are out of phase.
Leading
If a RLC parallel circuit contains more capacitive VARs than inductive VARs, the circuit has a _____ power factor.
53.13 degrees
An RLC series circuit has R = 42 Ω, XL = 80 Ω, and XC = 24 Ω. What is angle theta?
