NEW
Font size
WorksheetsElectrical resonance
Total questions: 18
Worksheet time: 9mins
Resonance in general, occurs when
the applied frequency is a maximum
the applied frequency is greater than the natural frequency
the applied frequency is equal to the natural frequency
the applied frequency is less than the natural frequency
A circuit is in resonance when
the impedance is an maximum
the impedance is zero
the reactance is maximum
the current is maximum
An LRC circuit has a "natural frequency" which is dependent on ...
inductance and capacitance
inductance resistance and capacitance
resistance and capacitance
inductance and resistance
What is reactance?
a measure of how much a capacitor or an inductor, increases a changing current
a measure of how much a capacitor or an inductor, restricts a current
a measure of how much a capacitor or an inductor, converts a changing current to heat
a measure of how much a capacitor or an inductor, restricts a changing current
What is the reactance of an inductor?
1/wL
L/w
wL
w/L
What is reactance of a capacitor?
wC
w/C
C/w
1/wC
What is the unit for capacitative reactance?
Farad
Ohm
Henry
Ohm Farad
What is impedance?
resistance
the sum of resistance and total reactance
the vector sum of resistance and total reactance
the sum of capacitative and inductive reactance
What is the difference between impedance and reactance
reactance depends on frequency but impedance does not
reactance involves resistance as well, but impedance does not
impedance is the vector sum of resistance and reactance
there is no difference
What are the symbols for impedance, reactance and resistance?
X, Z, R
X, Y, R
Z, X, R
Z, R, X
Which phasor is ahead of which?
inductor voltage is ahead of capacitor voltage which is ahead of resistor voltage
capacitor voltage is ahead of resistor voltage which is ahead of inductor voltage
capacitor voltage is ahead of inductor voltage which is ahead of resistor voltage
inductor voltage is ahead of resistor voltage which is ahead of capacitor voltage
Which phasor is ahead of which?
inductor reactance is ahead of resistance which is ahead of capacitive reactance
capacitive reactance is ahead of inductive reactance which is ahead of resistance
inductive reactance is ahead of capacitative reactance which is ahead of resistance
capacitor reactance is ahead of resistance which is ahead of inductor reactance
What is the formula for finding impedance?
(R2 − (wL − wC1)2)
(R2 + (wL + wC1)2)
(R2 − (wL + wC1)2)
An LRC resonates when the applied frequency is equal to
LC
LC1
LC2π
2πLC1
Current in an LRC circuit is
in phase with VR
in phase with Vs
in phase with VL
in phase with Vc
If the inductive reactance is smaller than the capacitive reactance, then the current
lags the supply voltage
leads the supply voltage
is in phase with the supply voltage
leads the resistor voltage
if the inductive reactance is less than the capacitive reactance then the circuit will move into resonance if
the inductance is decreased
capacitance decreased
capacitance is increased
the frequency is decreased
if the inductive reactance is less than the capacitative reactance, the circuit will move into resonance if
the overlapping area of the plates increases
the distance between the plates increases
the overlapping area of the plates decreases
the dielectric between the plates decreases
