Electrical Engineering MCQs

Page No. 81

The output characteristics of a JFET closely resemble the output characteristics of a ___________ valve?


apentode


b tetrode


ctriode


ddiode


View Answer pentode

In a FET, there are _____________pn junctions at the sides?


athree


b four


cfive


dtwo


View Answer two

For VGS = 0 V, the drain current becomes constant when VDS exceeds ________________?


acut off


bVDD


c VP


dV


View Answer VP

A MOSFET differs from a JFET mainly because _________________?


aof power rating


bthe MOSFET has two gates


c the JFET has a pn junction


dnone of the above



n a common-source JFET amplifier, the output voltage is _____________?


a 180o out of phase with the input


bin phase with the input


c90o out of phase with the input


dtaken at the source



A CS JFET amplifier has a load resistance of 10 kO , RD= 820O . If gm= 5mS and Vin= 500 mV, the output signal voltage is__________________?


a2.05 V


b25 V


c0.5 V


d 1.89 V


View Answer 1.89 V

In a certain common-source D-MOSFET amplifier, Vds =3.2 V r.m. and Vgs = 280 mV r.m.s. The voltage gain is_______________?


a 1


b11.4


c8.75


d3.2


View Answer 11.4

A certain common-source JFET has a voltage gain of 10. If the source bypass capacitor is removed, ______________?


athe voltage gain will increase


b the transconductance will increase


cthe voltage gain will decrease


dthe Q-point will shift



If load resistance in the above question (Q.49) is removed, the output voltage will_____________?


aincrease


bdecrease


cstay the same


d be zero


View Answer increase

A n-channel D-MOSFET with a positive VGS is operating in _______________?


athe depletion-mode


bthe enhancement-mode


ccut off


dsaturation


View Answer the enhancement-mode

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