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

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bDecreases

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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

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

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dThe feedback circuit must be capacitive

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An oscillator differs from an amplifier because it_____________?


a Has more gain

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bRequires no input signal

✓


cRequires no d.c. supply

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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

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c A change in frequency because of temperature

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dNone of the above

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


aMinimum

✓


b Maximum

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cHalf-way between maximum and minimum

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dNone of the above

✖


View Answer Minimum

The output impedance of an emitter follower is______________?


aHigh

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bVery high

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cAlmost zero

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d Low

✓


View Answer Low

A Wien bridge oscillator uses___________feedback?


aOnly positive

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bOnly negative

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cBoth positive and negative

✓


dNone of the above

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


a It has superior electrical properties

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bIt is easily available

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cIt is quite inexpensive

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dNone of the above

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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

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c310 mA

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d 0 A

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View Answer 490 mA

The signal generator generally used in the laboratories is___________oscillator?


a Wien-bridge

✓


bHartely

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cCrystal

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dPhase shift

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View Answer Wien-bridge

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