Electrical Engineering MCQs

Page No. 83

The pinch-off voltage in a JFET is analogous to _____________ voltage in a vacuum tube?


a anode

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bcathode

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cgrid cut off

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d none of the above

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View Answer grid cut off

_____________ has the lowest noise-level?


a triode

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bordinary trnsistor

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ctetrode

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d JFET

✓


View Answer JFET

Which of the following devices has the highest input impedance ?


a JFET

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bMOSFET

✓


cCrystal diode

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d ordinary transistor

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View Answer MOSFET

The two important advantages of a JFET are _________________?


ahigh input impedance and square-law property

✓


b inexpensive and high output impedance

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clow input impedance and high output impedance

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d none of the above

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In a JFET, when drain voltage is equal to pinch-off voltage, the depletion layers ______________?


aalmost touch each other

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b have large gap

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chave moderate gap

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d none of the above

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A JFET has high input impedance because _________________?


a it is made of semiconductor material

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b input is reverse biased

✓


cof impurity atoms

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dnone of the above

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A JFET has ____________ power gain?


asmall

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b very high

✓


cvery small

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d none of the above

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View Answer very high

If the reverse bias on the gate of a JFET is increased, then width of the conducting channel ______________?


a is decreased

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b is increased

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cremains the same

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d none of the above

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View Answer is decreased

A JFET is a__________ driven device?


acurrent

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bvoltage

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cboth current and voltage

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dnone of the above

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View Answer voltage

A MOSFET has______________ terminals?


atwo

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b five

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cfour

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d three

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View Answer three

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