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Free download in PDF Field Effect Transistor Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
At cut-off, the JFET channel is ……….
[A]
at its widest point
[B]
completely closed by the depletion region
[C]
extremely narrow
[D]
reverse baised
Answer: completely closed by the depletion region
(22)
The constant-current region of a JFET lies between
[A]
cut off and saturation
[B]
cut off and pinch-off
[C]
o and IDSS
[D]
pinch-off and breakdown
Answer: pinch-off and breakdown
(23)
A certain JFET data sheet gives VGS(off) = -4 V. The pinch-off voltage Vp is ……..
[A]
+4 V
[B]
-4 V
[C]
dependent on VGS
[D]
data insufficient
(24)
For VGS = 0 V, the drain current becomes constant when VDS exceeds ………
[A]
cut off
[B]
VDD
[C]
VP
[D]
none of the above
(25)
The channel of a JFET is between the …………….
[A]
gate and drain
[B]
drain and source
[C]
gate and source
[D]
input and output
(26)
If the cross-sectional area of the channel in n-channel JEFT increases, the drain current ……….
[A]
is increased
[B]
is decreased
[C]
remains the same
[D]
none of the above
(27)
The output characteristics of a JFET closely resemble the output characteristics of a ………. valve
[A]
pentode
[B]
tetrode
[C]
triode
[D]
diode
(28)
The source terminal of a JEFT corresponds to ………….. of a vacuum tube
[A]
plate
[B]
cathode
[C]
grid
[D]
none of the above
(29)
The transconductance of a JFET ranges from ……………..
[A]
100 to 500 mA/V
[B]
500 to 1000 mA/V
[C]
0.5 to 30 mA/V
[D]
above 1000 mA/V
(30)
In a FET, there are ……….. pn junctions at the sides
[A]
three
[B]
four
[C]
five
[D]
two
31
The gate voltage in a JFET at which drain current becomes zero is called ……….. voltage
[A]
saturation
[B]
pinch-off
[C]
active
[D]
cut-off
32
The input impedance of a MOSFET is of the order of ………..
[A]
O
[B]
a few hundred O
[C]
kO
[D]
several MO
33
The pinch-off voltage of a JFET is about ……….
[A]
5 V
[B]
0.6 V
[C]
15 V
[D]
25 V
34
If the gate of a JFET is made less negative, the width of the conducting channel……….
[A]
remains the same
[B]
is decreased
[C]
is increased
[D]
none of the above
35
In class A operation, the input circuit of a JFET is ………. biased
[A]
forward
[B]
reverse
[C]
not
[D]
none of the above
36
The pinch-off voltage in a JFET is analogous to ………. voltage in a vacuum tube
[A]
anode
[B]
cathode
[C]
grid cut off
[D]
none of the above
37
A MOSFET uses the electric field of a ………. to control the channel current
[A]
capacitor
[B]
battery
[C]
generator
[D]
none of the above
38
Which of the following devices has the highest input impedance?
[A]
JFET
[B]
MOSFET
[C]
Crystal diode
[D]
ordinary transistor
39
A MOSFET differs from a JFET mainly because ………………
[A]
of power rating
[B]
the MOSFET has two gates
[C]
the JFET has a pn junction
[D]
none of the above
Answer: the JFET has a pn junction
40
A certain D-MOSFET is biased at VGS = 0 V. Its data sheet specifies IDSS = 20mA and VGS(off) = -5 V. The value of the drain current is …………
[A]
20 mA
[B]
0 mA
[C]
40 mA
[D]
10 mA
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