WorksheetsLCR circuit
Total questions: 12
Worksheet time: 6mins
In a series, LCR-circuit, resonant frequency will be
L/C
LC
LC1
CL
If an AC voltage is applied to an LCR circuit, which of the following is true?
I and V are out of phase with each other in R.
I and V are in phase in L while in C, they are out of phase.
I and V are out of phase in both C and L.
I and V are out of phase in L and in phase in C.
The peak value of ac voltage on a 220 V mains is
2002
2202
2220
220
Series ac circuit has inductance L, resistance R and angular frequency to, the quality factor Q is
(RωL)2
RωL
ωLR
(ωLR)2
Average power generated in an inductor connected to an a.c. source is
2 1LI2
VI
Zero
None of these
The power factor varies between
2 and 2.5
3.5 to 5
1 to 2
0 to 1
The phase relationship between current and voltage in a pure resistive circuit is best represented by
Which of the following graphs represents the correct variation of inductive reactance XL with frequency u?
In which of the following circuits the maximum power dissipation is observed?
Pure capacitive circuit
Pure resistive circuit
Pure inductive circuit
None of these
At resonance frequency the impedance in series LCR circuit is
minimum
maximum
infinity
zero
An AC voltage source of variable angular frequency ω and fixed amplitude Vm is connected in series with a capacitance C and an electric bulb of resistance R (inductance zero). When ω is increased then,
The bulb glows dimmer
Total impedance of the circuit increases
No change
The bulb glows brighter
In an alternating current circuit consisting of elements in series, the current increases on increasing the frequency of supply. Which of the following elements are likely to constitute the circuit?
only resistor
resistor and an inductor
only inductor
resistor and a capacitor
