30 Questions
What is the current that does not contribute to the average power dissipation in an AC circuit?
Wattless current
What is the condition for resonance in a parallel LC circuit?
XL = XC
What is the quality factor of a circuit equivalent to at resonance?
Current amplification
What is the impedance of a circuit at resonance?
Infinite
What is a choke coil?
A device with high inductance and low resistance
What is the condition of resonance in a parallel RLC circuit?
XL = XC
What is the average value of the wattless component over one cycle in an AC circuit?
Zero
What is the quality factor of a circuit dependent on?
Resistance, inductance, and capacitance
What is the impedance of a circuit at resonance?
Equal to R
What is a choke coil?
A type of inductor
What is the condition for parallel resonance in a circuit containing a choke coil?
R < LC
What is the power factor of an ideal choke coil?
0
Why is a soft iron core used in a choke coil?
To improve the inductance of the circuit
What is the inductive reactance of a choke coil?
XL = 2πνL
What determines the frequency of AC produced by a generator?
Number of poles and rotational frequency of the coil
What is the condition for resonance in a series RLC circuit?
X_L = X_C
What is the significance of the quality factor Q in a circuit?
It determines the bandwidth of the circuit
What is the significance of the phasor diagram in AC circuits?
It helps to determine the phase difference between voltage and current
What is the significance of impedance in a series RLC circuit?
It determines the resonance frequency of the circuit
What is the application of series RLC circuits in telegraphy?
In selector circuits
What is the expression for the angular frequency of an alternating quantity?
ω = 2πν
What is the significance of the peak value of an alternating quantity?
It is the maximum value of the quantity
What is the relationship between the rms value and the peak value of an alternating quantity?
irms = i0/0.707
What is the unit of the angular frequency of an alternating quantity?
radians per second
What is the expression for the instantaneous value of an alternating current?
i = i0 sin ωt
What is the unit of impedance?
Ohm
What is the relationship between reactance and frequency?
Reactance is directly proportional to frequency
What is the significance of a phasor diagram?
It represents the voltage and current vectors of an AC circuit
What is the quality factor of a circuit dependent on?
The inductance and capacitance
What is the significance of the reciprocal of impedance?
It is the admittance of a circuit
Learn about the working and application of choke coils in alternating current circuits, including their characteristics, advantages, and uses in devices like fluorescent tubes.
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