Electrical Engineering MCQs

Page No. 139

In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency____________?


aRemains the same


bDecreases


c Increases


dInsufficient data


View Answer Increases

A second condition for oscillations is____________?


aA gain of 1 around the feedback loop


bNo gain around the feedback loop


cThe attention of the feedback circuit must be one-thirdThe attention of the feedback circuit must be one-third


dThe feedback circuit must be capacitive



An oscillator differs from an amplifier because it_____________?


a Has more gain


bRequires no input signal


cRequires no d.c. supply


dAlways has the same input



The piezoelectric effect in a crystal is___________?


a A voltage developed because of mechanical stress


bA change in resistance because of temperature


c A change in frequency because of temperature


dNone of the above



In an LC circuit, when the capacitor is maximum, the inductor energy is____________?


aMinimum


b Maximum


cHalf-way between maximum and minimum


dNone of the above


View Answer Minimum

The output impedance of an emitter follower is______________?


aHigh


bVery high


cAlmost zero


d Low


View Answer Low

A Wien bridge oscillator uses___________feedback?


aOnly positive


bOnly negative


cBoth positive and negative


dNone of the above



Quartz crystal is most commonly used in crystal oscillators because:____________?


a It has superior electrical properties


bIt is easily available


cIt is quite inexpensive


dNone of the above



There is a total of 800 mA of current into four parallel resistors. The currents through three of the resistors are 40 mA, 70 mA, and 200 mA. The current through the fourth resistor is______________?


a490 mA


b 800 mA


c310 mA


d 0 A


View Answer 490 mA

The signal generator generally used in the laboratories is___________oscillator?


a Wien-bridge


bHartely


cCrystal


dPhase shift


View Answer Wien-bridge

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