Question 2 :
Whenthe values of inductance and capacitance in an $$L-C$$ circuit are $$0.5\ H$$ and $$8\ \mu$$F respectively then currentinthe circuit is maximum. The angular frequency ofalternatinge.m.f. applied in the circuit will be
Question 5 :
In an ac circuit with voltage V and current I, the power dissipated is
Question 6 :
An inductance, a capacitance and a resistance are connected in series across a source of alternating voltages. At resonance, the applied voltage and the current flowing through the circuit will have a phase difference of<br/>
Question 7 :
In a circuit $$LC = 10^{-3}H, C = 10^{-3} F$$. Find angular frequency.<br/>
Question 8 :
A transformer having $$4000$$ turns on its primary side and $$500$$ turns on the secondary side. If the input voltage is $$240\ V$$, find out the output voltage of the secondary side of the transformer ?
Question 9 :
The primary to secondary turns ratio of a transformer is given as 2 : 3. If the current through the primary coil is 3 A, then the current through load resistance is<br/>
Question 10 :
A step down transformer changes the high input voltage used in our houses $$(120V)$$ into the low voltage used to charge an electric razor $$(24V)$$. What must be the ratio of the turns of wire from the primary side of the transformer to the secondary side?
Question 11 :
Assertion: A step up transformer can also be used as a step down transformer.
Reason: This is because $$\cfrac { { E }_{ p } }{ { E }_{ s } } =\cfrac { { n }_{ s } }{ { n }_{ p } } $$
Question 12 :
If the resistance in a parallel resonant circuit is reduced, the bandwidth:
Question 13 : <p>Primary winding and secondary winding of a transformer has<br>100 and 300 turns respectively. If its input power is 60 W then output power of<br>the transformer will be</p>
Question 14 :
The current which does not contribute to the power consumed in an AC circuit is called:
Question 16 :
$$Transformer \rightarrow ideal \rightarrow E_{P} = 1000\ V, I_{P} = 50A$$<br>$$220V \rightarrow 80\ houses$$<br>Resistance of secondary coil will be
Question 17 : <p>The square root ofthe product ofinductance and capacitance has dimensions of</p>
Question 18 :
In a transformer the output current and voltage are $$4 A$$and$$20 V$$respectively. If the ratio of number ofturns inthe primary and secondary coil is$$2 : 1$$respectively, what isthe input current and voltage?
Question 19 :
In a $$LC$$ circuit. Angular frequency at resonance is $$w$$. What will be the new angular frequency when inductor's introduces is made $$2$$ times and capacitance is made $$4$$ times?
Question 20 :
A step up transformer operates on a $$230V$$ line and supplies to a load $$2A$$. The ratio of primary to secondary windings is $$1:25$$. Determine the primary current.
Question 21 :
What would be the Q factor for a purely inductive circuit?
Question 22 :
An ideal transformer has 500 and 5000 turns inprimary and secondary winding respectively. If theprimary coil is connected to a 6 V battery then thesecondary voltage is :
Question 23 :
The ratio between the primary voltage and the secondary voltage in a transformer is equal to:<br/>
Question 24 :
A transformer is used to light a $$120 W$$,$$24 V$$lamp from$$240 V$$a.c. mains. The current in the main cableis$$0.6 A$$.The efficiency of the transformer is
Question 27 :
A transformer steps up an $$AC$$supply from$$220 V$$to$$2200V$$. If the secondary coil of the transformer has$$2000$$turns, the number of turns in its primary coil will be:
Question 29 :
Thesharpness of resonance in a series $$L-C-R$$ resonantcircuit,as the resistance of the circuit is increased,goeson
Question 30 :
A certain series resonant circuit has a bandwidth of $$2 kHz$$. If the existing coil is replaced with one having a higher value of $$Q$$, the bandwidth will<br/>
Question 32 :
A transformer connected to $$220$$ volt line shows an output of $$2A$$ at $$11000V$$. The efficiency is $$100$$%. The current drawn from the line is:
Question 33 :
If a stepup transformer develops 400V in secondary coil for an input of 200V A.C, then the current in the transformer is :<br/>
Question 35 :
In an ideal parallel LC circuit, the capacitor is charged by connecting it to a DC source which is then disconnected. The current in the circuit
Question 36 :
A step-down transformer reduces the voltage of a transmission line from $$2200\ V$$ to $$220\ V$$. The power delivered by it is $$880\ W$$ and its efficiency is $$88$$%. The input current is :
Question 37 :
What do we name the  device which increases the emf ?<br/>
Question 38 :
For L-C-R, A.C circuit resonance frequency is $$600Hz$$ and frequencies at half power points are $$550Hz$$ and $$650Hz$$. What will be the Q-factor?
Question 39 :
An alternating voltage frequency $$\omega$$ is induced in electric circuit consisting of an inductance $$L$$ and capacitance $$C$$, connected in parallel. Then across the inductance coil the<br>(i) current is maximum when $${\omega}^{2}=1/(LC)$$<br>(ii) current is minimum when$${\omega}^{2}=1/(LC)$$<br>(iii) voltage is minimum when$${\omega}^{2}=1/(LC)$$<br>(iv) voltage is maximum when$${\omega}^{2}=1/(LC)$$
