# Physical Electronics - Electronic devices and ICS

Physical Electronics - Electronic devices and ICS
Question:-
Option (A)
By two back-biased p-n junctions
Option (B)
By the length of the source
Option (C)
By the length of the drain
Option (D)
By the lengths of both the source and the drain
Correct Option:
A
Question Solution:

The channel width in a JFET is controlled by the gate-to-source voltage, VGS. On applying the reverse biased voltage, the depletion width of p-n junction increases and hence, the effective channel width reduces. This way the channel width is controlled in JFET by two-biased p-n junctions.
Question:-
Option (A)
 A B C D 2 1 4 3
Option (B)
 A B C D 3 1 4 2
Option (C)
 A B C D 3 4 1 2
Option (D)
 A B C D 2 4 1 3
Correct Option:
C
Question Solution:
(i) Zener diode is used for reference voltage
(ii) Tunnel diode is high frequency switching circuit
(iii) Varactor diode is used for high frequency tuning purposes.
Question:-
Option (A)
Both A and R are individually true and R is the correct explanation of A
Option (B)
Both A and R are individually true but R is not the correct explanation of A
Option (C)
A is true but R is false
Option (D)
A is false but R is true
Correct Option:
B
Question:-
Option (A)
Both A and R are individually true and R is the correct explanation of A
Option (B)
Both A and R are individually true but R is not the correct explanation of A
Option (C)
A is true but R is false
Option (D)
A is false but R is true
Correct Option:
D
Question:-
Option (A)
10 mA
Option (B)
9.7 mA
Option (C)
0 mA
Option (D)
1 mA
Correct Option:
B
Question Solution:
Collector current in saturation
ICS = {(VCC - VCE sat) / RC}
Þ ICS = {(10-0.3)/(1 x 103)}
Þ ICS = 9.7 mA