Physics MCQs

Page No. 46

n an LCR series circuit, if V is the effective value of the applied voltage VR is the voltage across R VL is the effective voltage across L & Vc is the effective voltage across C then_______________?


aV = VR+VL+VC


bV2 = VR2+VL2+VC2


c V2 = VR2+(VL-VC)2


dV2 = VL2+(VR-VC)2


View Answer V2 = VR2+(VL-VC)2

The phase angle between the voltage and the current in an AC circuit consisting of a resistance is______________?


aZero


b45°


c 90°


d180°


View Answer Zero

Choose the correct statement. In the case of AC circuit ohms law holds for_______________?


aPeak values of voltage and current


b Effective values of voltage and current


cInstantaneous values of voltage and current


dAll of the above


View Answer All of the above

An inductive coil has a resistance of 100Ω. When an AC signal of frequency 1000Hz is fed to the coil the applied voltage leads the current by 45Ω. What is the inductance of the coil ?


a10mH


b12mH


c16mH


d20mH


View Answer 16mH

An A.C series circuit containing 4Ω resistance and 3Ω inductive reactance. The impedance of the circuit is______________?


a


b


c


d


View Answer

At resonance the value of the power factor in an L-C-R series circuit is_______________?


aZero


b2


c1


dNot definite


View Answer 1

A choke is used as a resistance in_________________?


aDC circuit


bAC circuits


cBoth AC and DC circuit


d Full wave rectifier circuit


View Answer AC circuits

A 10Ω electric heater is connected to a 220V 50Hz mains supply. What is the peak value of the potential difference across the heater element ?


a220V


b 220/ 2V


c110V


d220 √2V


View Answer 220 √2V

The frequency of a circuit consisting of a capacitance C and a resistor R is________________?


aC/R


bR/C


c1/RC


d1/ 2RC


View Answer 1/RC

What is the self-inductance of a coil in which an induced emf of 2V is set up when the current changes at the rate of 4 As-1 ?


a0.5 mH


b0.5H


c2.0H


d8.0H


View Answer 0.5H

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