Practice Field Effect Transistors (Fet) Multiple Choice Questions with Answers Quiz-2

Q.1.

With a JFET, a ratio of output current change against an input voltage change is called:

transconductance
siemens
resistivity
gain

Q.2.

The common-source JFET amplifier has:

a very high input impedance and a relatively low voltage gain
a high input impedance and a very high voltage gain
a high input impedance and a voltage gain less than 1
no voltage gain

Q.3.

In an n-channel JFET, what will happen at the pinch-off voltage?

the value of V_DS at which further increases in V_DS will cause no further increase in I_D
the value of V_GS at which further decreases in V_GS will cause no further increases in I_D
the value of V_DG at which further decreases in V_DG will cause no further increases in I_D
the value of V_DS at which further increases in V_GS will cause no further increases in I_D

Q.4.

In the constant-current region, how will the I_DS change in an n-channel JFET?

As V_GS decreases I_D decreases.
As V_GS increases I_D increases.
As V_GS decreases I_D remains constant.
As V_GS increases I_D remains constant.

Q.5.

Which JFET configuration would connect a high-resistance signal source to a low-resistance load?

source follower
common-source
common-drain
common-gate

Q.6.

Junction Field Effect Transistors (JFET) contain how many diodes?

4
3
2
1

Q.7.

With the E-MOSFET, when gate input voltage is zero, drain current is:

at saturation
zero
I_DSS
widening the channel

Q.8.

Which type of JFET bias requires a negative supply voltage?

feedback
source
gate
voltage divider

Q.9.

The overall input capacitance of a dual-gate D-MOSFET is lower because the devices are usually connected:

in parallel
with separate insulation
with separate inputs
in series

Q.10.

A MOSFET has how many terminals?

2 or 3
3
4
3 or 4

Q.11.

I_DSS can be defined as:

the minimum possible drain current
the maximum possible current with V_GS held at –4 V
the maximum possible current with V_GS held at 0 V
the maximum drain current with the source shorted

Q.12.

How will electrons flow through a p-channel JFET?

from source to drain
from source to gate
from drain to gate
from drain to source

Q.13.

When an input delta of 2 V produces a transconductance of 1.5 mS, what is the drain current delta?

666 mA
3 mA
0.75 mA
0.5 mA

Q.14.

With a 30-volt V_DD, and an 8-kilohm drain resistor, what is the E-MOSFET Q point voltage, with I_D = 3 mA?

6 V
10 V
24 V
30 V

Q.15.

How will a D-MOSFET input impedance change with signal frequency?

As frequency increases input impedance increases.
As frequency increases input impedance is constant.
As frequency decreases input impedance increases.
As frequency decreases input impedance is constant.

Q.16.

What is the input impedance of a common-gate configured JFET?

very low
low
high
very high

Q.17.

When V_GS = 0 V, a JFET is:

saturated
an analog device
an open switch
cut off

Q.18.

When not in use, MOSFET pins are kept at the same potential through the use of:

shipping foil
nonconductive foam
conductive foam
a wrist strap

Q.19.

To get a negative gate-source voltage in a self-biased JFET circuit, you must use a ________.

negative gate supply voltage
ground
voltage divider
source resistor

Q.20.

When an input signal reduces the channel size, the process is called:

enhancement
substrate connecting
gate charge
depletion

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