In an ac circuit, a resistance of R ohm is connected in series with an inductance L. If phase angle between voltage and current be 45°, the value of inductive reactance will be 

(1) R4

(2) R2

(3) R

(4) Cannot be found with the given data

Concept Questions :-

Different types of AC Circuits
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The phase difference between the current and voltage of LCR circuit in series combination at resonance is 

(1) 0

(2) π/2

(3) π

(4) –π

Concept Questions :-

LC oscillations
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In a series resonant circuit, the ac voltage across resistance R, inductance L and capacitance C are 5 V, 10 V and 10 V respectively. The ac voltage applied to the circuit will be 

(1) 20 V

(2) 10 V

(3) 5 V

(4) 25 V

Concept Questions :-

LC oscillations
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In a series LCR circuit, resistance R = 10Ω and the impedance Z = 20Ω. The phase difference between the current and the voltage is 

(1) 30°

(2) 45°

(3) 60°

(4) 90°

Concept Questions :-

Different types of AC Circuits
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In the circuit shown below, the ac source has voltage V=20cos(ωt) volts with ω = 2000 rad/sec. the amplitude of the current will be nearest to 

(1) 2A

(2) 3.3 A

(3) 2/5A

(4) 5A

Concept Questions :-

Different types of AC Circuits
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In an ac circuit the reactance of a coil is 3 times its resistance, the phase difference between the voltage across the coil to the current through the coil will be 

(1) π/3

(2) π/2

(3) π/4

(4) π/6

Concept Questions :-

Different types of AC Circuits
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The capacity of a pure capacitor is 1 farad. In dc circuits, its effective resistance will be 

(1) Zero

(2) Infinite

(3) 1 ohm

(4) 1/2 ohm

Concept Questions :-

Different types of AC Circuits
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The power factor of an ac circuit having resistance (R) and inductance (L) connected in series and an angular velocity ω is 

(1) R/ωL

(2) R/(R2+ω2L2)1/2

(3) ωL/R

(4) R/(R2ω2L2)1/2

Concept Questions :-

Different types of AC Circuits
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An inductor of inductance L and resistor of resistance R are joined in series and connected by a source of frequency ω. The power dissipated in the circuit is :

(1) (R2+ω2L2)V

(2) V2R(R2+ω2L2)

(3) V(R2+ω2L2)

(4) R2+ω2L2V2

Concept Questions :-

Different types of AC Circuits
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In a LCR circuit the pd between the terminals of the inductance is 60 V, between the terminals of the capacitor is 30V and that between the terminals of resistance is 40V. the supply voltage will be equal to …… 

(1) 50 V

(2) 70 V

(3) 130 V

(4) 10 V

Concept Questions :-

Different types of AC Circuits
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