1.
Copyright 2016 Hewitt
Question 326074
As the frequency of the ac voltage across an inductor approaches zero, the inductive reactance of that coil
A. approaches zero.
B. approaches infinity.
C. becomes negative.
D. approaches one.
Copyright 2016 Hewitt
2.
Copyright 2014 Jeffrey Bindell
Question 129732
The reactance of a capacitor
A. increases
B. remains the same
C. decreases
as the frequency of the applied voltage increases.
Copyright 2016 Hewitt
3.
Copyright 2015 Joshua Colwell
Question 225348
If the value of the capacitance is doubled, the capacitive reactance
A. is quartered.
B. is halved.
C. is doubled.
D. is quadrupled.
Copyright 2015 Joshua Colwell
4.
Copyright 2017 Murray Silverstone
Question 564457
The capacitive reactance of a circuit is 50Ω and the inductive reactance is 50Ω. Does the current lead or lag the emf?
A. Leads
B. Lags
C. Current and emf are in phase
D. Cannot be answered with the information given
Copyright 2015 Joshua Colwell
5.
Copyright 2017 Murray Silverstone
Question 564456
The capacitive reactance of a circuit is 100Ω and the inductive reactance is 50Ω. Does the current lead or lag the emf?
A. Leads
B. Lags
C. Current and emf are in phase
D. Cannot be answered with the information given
Copyright 2017 Murray Silverstone
6.
Copyright 2015 Reina Maruyama
Question 195954
Consider the sinusoidally driven series LCR circuit shown.
Vmax = 100 V
Imax = 2 mA
VCmax = 113 V
The current leads generator voltage by 45°
L and R are unknown.
What is XC, the reactance of the capacitor? (don't forget the units!)
Copyright 2017 Murray Silverstone
Copyright
2015
Reina Maruyama
Question
461145
7.
Consider the sinusoidally driven series LCR circuit shown.
Vmax = 100 V
Imax = 2 mA
VCmax = 113 V
The current leads generator voltage by 45°
L and R are unknown.
What is Z, the total impedance? (don't forget the units!)
Copyright 2015 Reina Maruyama
8.
Copyright 2014 Jeffrey Bindell
Question 131854
Which one of the phasor diagrams shown below best represents a series LRC circuit driven at resonance?
A. 1
B. 2
C. 3
D. 4
E. 5
Copyright 2015 Reina Maruyama
9.
Copyright 2014 Pearson
Question 92181
_
In an L-R-C series circuit as shown, suppose that the angular frequency of the ac source equals the resonance angular frequency. In this
case, the circuit impedance
A. is maximum.
B. is minimum, but not zero.
C. is zero.
D. is neither a maximum nor a minimum.
E. not enough information give to decide
Copyright 2014 Pearson
10.
Copyright 2016 Hewitt
Question 326076
When an RLC series circuit is in resonance, its impedance is:
A. zero.
B. maximum.
C. minimum.
D. π/2 Ohms.
Copyright 2014 Pearson
11.
Copyright 2015 Reina Maruyama
Question 195948
Consider the harmonically driven series LCR circuit shown.
Vmax = 100 V
Imax = 2 mA
VCmax = 113 V
The current leads generator voltage by 45°
L and R are unknown.
Do you have to increase or decrease the driving frequency to achieve resonance?
A. Increase
B. Decrease
C. The circuit is already on resonance
Copyright 2015 Reina Maruyama
D. Answer cannot be determined
Copyright 2015 Reina Maruyama
12.
Copyright 2016 Hewitt
Question 329721
If the value of R is increased, the resonance frequency of this circuit
A. Increases.
B. Decreases.
C. Stays the same.
Copyright 2016 Hewitt