Electrical Engineering MCQs

Page No. 17

RC coupling is generally confined to low power applications because of____________?


aLarge value of coupling capacitor


b Low efficiency


c Large number of components


d None of the above


View Answer Low efficiency

An amplifier receives 0.1 W of input signal and delivers 15 W of signal power. What is the power gain in db?


a8 db


b6 db


c5 db


d4 db


View Answer 8 db

The gain of an amplifier is expressed in db because_____________?


aIt is a simple unit


bCalculations become easy


cHuman ear response is logarithmic


dNone of the above



The frequency response of transformer coupling is___________?


aGood


bVery good


cExcellent


d Poor


View Answer Poor

1 db corresponds to_____________change in power level?


a50%


b35%


c 26%


d 22%


View Answer 26%

The lower and upper cut off frequencies are also called_____________frequencies?


a Sideband


bResonant


cHalf-resonant


dHalf-power


View Answer Half-power

The ear is not sensitive to___________?


aFrequency distortion


bAmplitude distortion


cFrequency as well as amplitude distortion


dNone of the above


View Answer Frequency distortion

Transformer coupling provides high efficiency because___________?


aCollector voltage is stepped up


bresistance is low


ccollector voltage is stepped down


dnone of the above


View Answer resistance is low

The noise factor of an ideal amplifier expressed in db is_____________?


a0


b 1


c1


d10


View Answer 0

Transformer coupling is used for__________amplification?


aPower


bVoltage


cCurrent


dNone of the above


View Answer Power

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