MCQs on Analog Electronics

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01․ When the JFET is no longer able to control the current, this point is called the
breakdown region.
depletion region.
saturated point.
pinch-off region.

Under construction.
02․ The common-source JFET amplifier has
a very high input impedance and a relatively low voltage
a high input impedance and a very high voltage gain.
a high input impedance and a voltage gain less than 1.
no voltage gain.

Under construction.
03․ A JFET has disadvantage of
being noisy.
having small gain-bandwidth product.
possessing positive temperature coefficient.
having low input impedance.

Under construction.
04․ When the drain saturation electric current is less than IDSS a JFET acts like a
BJT.
current source.
battery.
resistor.

Under construction.
05․ A JFET can operate in
enhancement mode only.
depletion mode only.
depletion and enhancement mode only.
none of these.

Under construction.
06․ For a JEFT, when VDS is increased beyond the pinch-off voltage, the drain electric current
increased.
decreases.
remains constant.
first increase and then decreased.

Under construction.
07․ In a JFET, if the gate voltage Vgs is made more negative, then
channel conductivity increases.
depletion region decreases.
channel conductivity decreases.
channel electric current increases .

Under construction.
08․ Pinch-off voltage in a JFET is
the drain voltage that gives zero drain current.
the gate to source voltage that gives zero drain current.
the gate to source voltage that gives unity drain current.
the drain voltage that gives infinite drain current.

Under construction.
09․ When a reverse bias is applied to gate of JFET the depletion region width
is uniform in the channel.
is wider near the drain and tapers near source.
is wider near the source and tapers near the drain.
none of the above.

Under construction.
10․ The properties of JFET resemble those of
thermionic valves.
NPN transistors.
PNP transistors.
UJT.

Under construction.
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