FET and FET Amplifiers MCQs

Question 1

A field-effect-transistor (FET) operates on

Accepted Answer

majority carriers only

Answer

minority carriers only

Answer

positively-charged ions only

Answer

all the above

Question 2

Statement-I JFET operates only in enhancement mode,Statement-2-MOSFET operates both in depeletion and enhancement modes. Key

Accepted Answer

only statement 2 is true

Answer

only statement I is true

Answer

both statements 1 and 2 are true

Answer

neither statement I nor 2 is true

Question 3

Statement-I An N-channel deple- A P-channel ention mode is a normally ON device requiring a positive voltage to turn if ON,Statement-2 MOSFET hancement mode MOSFET is a normally-OFF device negative gate voltage requiring to turn it OFF. Key

Accepted Answer

only statement 1 is correct

Answer

only statement 2 is correct

Answer

both statements I and 2 are correct

Answer

neither of the two statements is correct

Question 4

Each of the following statements reading JFET is true except

Accepted Answer

in its schematic symbol, the arrow always points to P-type material

Answer

it is a 3-terminal unipolar semiconductor decice

Answer

like vacuum tubes, it is voltage controlled device

Answer

it has two internally-connected heavily-doped gates

Question 5

One advantage of FET over a bipolar is its lower input resistance This statement is

Accepted Answer

false

Answer

true

Answer

depends on whether it is JFET or MOSFET

Answer

all the above

Question 6

JFET is often called square-law device because its

Accepted Answer

transconductance curve is parabolic

Answer

drain current varies as square of drain voltage for a fixed gate-source voltage

Answer

reverse gate leakage current varies as square of the reverse gate voltage

Answer

ac resistance from drain to source varies inversely as square of the drain current

Question 7

A JFET can operate in

Accepted Answer

depletion mode only

Answer

depletion and enhancement modes

Answer

enhancement mode only

Answer

neither enhancement nor depletion mode

Question 8

FETs have similar properties to

Accepted Answer

thermionic valves

Answer

PNP transistors

Answer

NPN transistors

Answer

unijunction transistors

Question 9

Which statement about MOSFET is false? It can operate in

Accepted Answer

depletion-only mode

Answer

depletion mode

Answer

enhancement mode

Answer

depletion and enhancement modes