FET and FET Amplifiers MCQs

Question 1

In a JFET, the point of reference is usually

Accepted Answer

source

Answer

drain

Answer

gate

Answer

either (b) or (c)

Question 2

In a JFET, the primary control on drain current is exerted by

Accepted Answer

gate reverse bias

Answer

channel resistance

Answer

size of depletion regions

Answer

voltage drop across channel

Question 3

After Nips reaches pinch-off value Vp in a JFET, drain current ID becomes

Accepted Answer

saturated

Answer

zero

Answer

low

Answer

reversed

Question 4

In a JFET, drain current in maximum when VGs is

Accepted Answer

zero

Answer

negative

Answer

positive

Answer

equal to Vp

Question 5

A JFET can be cut-off with the help of

Accepted Answer

VGs

Answer

VDS

Answer

VDG

Answer

VDD

Question 6

A DE MOSFET differs from a JFET in the sense that it has no

Accepted Answer

P-N junctions

Answer

channel

Answer

gate

Answer

substrate

Question 7

Grounding rings are used with MOSFETs in order to

Accepted Answer

avoid any stray or static voltage at the gate

Answer

protect them against any physical injury during transit

Answer

which may destroy Si02 layer protect them against any stray magnetic field

Answer

provide ground for eddy currents induced between its terminals

Question 8

For protecting a MOSFET against damage from stray voltage developing at the gate, following methods are used. Pick out the one which is NOT correct.

Accepted Answer

only source terminal is earthed during transit

Answer

grounding rings are used which are removed only when it is wired securely into the circuit

Answer

it is inserted into conducting sponge during transit

Answer

back-to-back Zener diodes are formed into the monolithic structure of the MOSFET.

Question 9

The input gate current of a FET is

Accepted Answer

negligibly small

Answer

a few microamperes

Answer

a few milliamperes

Answer

a few amperes