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Electrical Engineering
FET(Field Effect Transistors)
Quiz 1
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Q.1
___________ has the lowest noise-level
triode
ordinary trnsistor
tetrode
JFET
Q.2
The input impedance of a MOSFET is of the order of ___________
O
a few hundred O
kΩ
several MO
Q.3
In class A operation, the input circuit of a JFET is ___________ biased
forward
reverse
not
none of the above
Q.4
A MOSFET can be operated with ___________
negative gate voltage only
positive gate voltage only
positive as well as negative gate voltage
none of the above
Q.5
A JFET is a ___________ driven device
current
voltage
both current and voltage
none of the above
Q.6
A JFET has ___________ power gain
small
very high
very small
none of the above
Q.7
The two important advantages of a JFET are ___________
high input impedance and square-law property
inexpensive and high output impedance
low input impedance and high output impedance
none of the above
Q.8
In a JFET, IDSS is known as ___________
drain to source current
drain to source current with gate shorted
drain to source current with gate open
none of the above
Q.9
In a FET, there are ___________ pn junctions at the sides
three
four
five
two
Q.10
Which of the following devices has the highest input impedance?
JFET
MOSFET
Crystal diode
ordinary transistor
Q.11
The pinch-off voltage in a JFET is analogous to ___________ voltage in a vacuum tube
anode
cathode
grid cut off
none of the above
Q.12
At cut-off, the JFET channel is ___________
at its widest point
completely closed by the depletion region
extremely narrow
reverse baised
Q.13
In a JFET, when drain voltage is equal to pinch-off voltage, the depletion layers
almost touch each other
have large gap
have moderate gap
none of the above
Q.14
A JFET is similar in operation to ___________ valve
diode
pentode
triode
tetrode
Q.15
A JFET is also called ___________ transistor
unipolar
bipolar
unijunction
none of the above
Q.16
A common base configuration of a pnp transistor is analogous to ___________ of a JFET
common source configuration
common drain configuration
common gate configuration
none of the above
Q.17
A MOSFET is sometimes called ___________ JFET
many gate
open gate
insulated gate
shorted gate
Q.18
In a common source JFET amplifier, the output voltage is ___________
in phase with the input
taken at the source
Q.19
A CS JFET amplifier has a load resistance of 10 kΩ , RD= 820° . If gm= 5mS and Vin= 500 mV, the output signal voltage is ___________
2.05 V
25 V
0.5 V
1.89 V
Q.20
A certain common source JFET has a voltage gain of 10. If the source bypass capacitor is removed, ___________
the voltage gain will increase
the transconductance will increase
the voltage gain will decrease
the Q-point will shift
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