Basic Electronics (3110016) MCQs

MCQs of Field effect transistors (FET) and its biasing

Showing 11 to 20 out of 99 Questions
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11.
The transconductance increases when the drain current approaches
(a) 0
(b) ID(SAT)
(c) IDSS
(d) IS
Answer:

Option (c)

12.
A CS amplifier has a voltage gain of
(a) gmrd
(b) gmrS
(c) gmrS/(1+gmrS)
(d) gmrd/(1+gmrd)
Answer:

Option (a)

13.
A source follower has a voltage gain of
(a) gmrd
(b) gmrS
(c) gmrS/(1+gmrS)
(d) gmrd/(1+gmrd)
Answer:

Option (c)

14.
When the input signal is large, a source follower has
(a) A voltage gain of less than 1
(b) Some distortion
(c) A high input resistance
(d) All of these
Answer:

Option (d)

15.
The input signal used with a JFET analog switch should be
(a) Small
(b) Large
(c) A square wave
(d) Chopped
Answer:

Option (a)

16.
A cascade amplifier has the advantages of
(a) Large voltage gain
(b) Low input capacitance
(c) Low input impedance
(d) Higher gm
Answer:

Option (b)

17.
VHF covers frequencies from
(a) 300 kHz to 3 MHz
(b) 3 to 30 MHz
(c) 30 to 300 MHz
(d) 300 MHz to 3 GHz
Answer:

Option (c)

18.
When a JFET is cut off, the depletion layers are
(a) Far apart
(b) Close together
(c) Touching
(d) Conducting
Answer:

Option (c)

19.
When the gate voltage becomes more negative in an n-channel JFET, the channel between the depletion layers
(a) Shrinks
(b) Expands
(c) Conducts
(d) Stops conducting
Answer:

Option (a)

20.
If a JFET has IDSS = 8 mA and VP = 4 V, then RDS equals
(a) 200 Ω
(b) 320 Ω
(c) 500 Ω
(d) 5 kΩ
Answer:

Option (c)

Showing 11 to 20 out of 99 Questions
1 2 3 4 5 6