Electrical Engineering MCQs

Page No. 17

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


aLarge value of coupling capacitor

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b Low efficiency

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c Large number of components

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d None of the above

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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

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b6 db

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c5 db

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d4 db

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View Answer 8 db

The gain of an amplifier is expressed in db because_____________?


aIt is a simple unit

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bCalculations become easy

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cHuman ear response is logarithmic

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dNone of the above

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The frequency response of transformer coupling is___________?


aGood

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bVery good

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cExcellent

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d Poor

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View Answer Poor

1 db corresponds to_____________change in power level?


a50%

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b35%

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c 26%

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d 22%

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View Answer 26%

The lower and upper cut off frequencies are also called_____________frequencies?


a Sideband

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bResonant

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cHalf-resonant

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dHalf-power

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View Answer Half-power

The ear is not sensitive to___________?


aFrequency distortion

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bAmplitude distortion

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cFrequency as well as amplitude distortion

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dNone of the above

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View Answer Frequency distortion

Transformer coupling provides high efficiency because___________?


aCollector voltage is stepped up

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bresistance is low

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ccollector voltage is stepped down

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dnone of the above

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View Answer resistance is low

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


a0

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b 1

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c1

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d10

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View Answer 0

Transformer coupling is used for__________amplification?


aPower

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bVoltage

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cCurrent

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dNone of the above

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View Answer Power

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