A resistance of 20 ohms is connected to a source of an alternating potential V=220sin(100πt). The time taken by the current to change from its peak value to r.m.s value is 

(1) 0.2 sec

(2) 0.25 sec

(3) 25 × 10–3 sec

(4) 2.5 × 10–3 sec

Concept Questions :-

Different types of AC Circuits
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Voltage and current in an ac circuit are given by V=5sin100πtπ6 and I=4sin100πt+π6 

(1) Voltage leads the current by 30°

(2) Current leads the voltage by 30°

(3) Current leads the voltage by 60°

(4) Voltage leads the current by 60°

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Different types of AC Circuits
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An alternating current of frequency ‘f’ is flowing in a circuit containing a resistance R and a choke L in series. The impedance of this circuit is 

(1) R + 2πfL

(2) R2+4π2f2L2

(3) R2+L2

(4) R2+2πfL

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Different types of AC Circuits
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A resistance of 300 Ω and an inductance of 1π henry are connected in series to a ac voltage of 20 volts and 200 Hz frequency. The phase angle between the voltage and current is :

(1) tan143

(2) tan134

(3) tan132

(4) tan125

Concept Questions :-

Different types of AC Circuits
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In a region of uniform magnetic induction B = 10–2 tesla, a circular coil of radius 30 cm and resistance π2 ohm is rotated about an axis that is perpendicular to the direction of B and which forms a diameter of the coil. If the coil rotates at 200 rpm the amplitude of the alternating current induced in the coil is :

(1) 4π2 mA

(2) 30 mA

(3) 6 mA

(4) 200 mA

Concept Questions :-

Different types of AC Circuits
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In a LCR circuit having L = 8.0 henry, C = 0.5 μF and R = 100 ohm in series. The resonance frequency in radian per second is 

(1) 600 radian

(2) 600 Hz

(3) 500 radian

(4) 500 Hz

Concept Questions :-

Different types of AC Circuits
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The impedance of a circuit consists of 3 ohm resistance and 4 ohm reactance. The power factor of the circuit is :

(1) 0.4

(2) 0.6

(3) 0.8

(4) 1.0

Concept Questions :-

Different types of AC Circuits
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The power factor of a good choke coil is:

(1) Nearly zero

(2) Exactly zero

(3) Nearly one

(4) Exactly one

Concept Questions :-

Different types of AC Circuits
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L, C and R represent physical quantities inductance, capacitance and resistance respectively. The combination representing dimension of frequency is 

(1) LC

(2) (LC)–1/2

(3) LC1/2

(4) CL

Concept Questions :-

LC oscillations
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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

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Different types of AC Circuits
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