# Analog signals

Analog signals
Question:-
Option (A)
3.03 nF
Option (B)
0.3 nF
Option (C)
0.33 μF
Option (D)
3.03 pF
Correct Option:
A
Question Solution:
T = 1.1 RC
Or C =
= = 3.03 nF
Question:-
Option (A)
A rectangular pulse of duration T
Option (B)
A rectangular pulse of duration 2T
Option (C)
A triangular pulse of duration T
Option (D)
A triangular pulse of duration 2T
Correct Option:
D
Question Solution:
Rectangular pulse

Its auto correlation function is
Rxx(τ)=
=Triangular pulse of interval 2T.
Question:-
Option (A)
6.87 kΩ
Option (B)
1.34 kΩ
Option (C)
2.89 kΩ
Option (D)
10.82 kΩ
Correct Option:
C
Question Solution:
As v0 = 0 for vs = 0, the amplifier is to be analysed for static (dc) conditions. Redrawing the circuit for quiescent condition.

Taking the Q2 circuit
=0
= = 2.67 mA
Assumption is neglected,
Voltage drop across
=2.67 x 10-3 x 1.5 x 103 = 4V
Voltage across RC1=
=4 + 0.6 = 4.6 V
= = 2.56 mA
For Q1 circuit
12=(Re + 1.8 k)
=> =Re + 1.8 k
therefore, Re=4.69 - 1.8 = 2.89 kΩ
Question:-
Option (A)
ac restorers
Option (B)
dc restorers
Option (C)
voltage to frequency converters
Option (D)
sweep circuits
Correct Option:
B
Question:-
Option (A)
0.28 μ sec
Option (B)
2.8 μ sec
Option (C)
14 μ sec
Option (D)
30 μ sec.
Correct Option:
C
Question Solution:
At saturation,
RL=
IB(ON)=
R1=
therefore, Time period =2 RC ln2
=2 x 100 x 103 x 100 x 10-12 x 0.69
=1.38 x 10-5
=13.8 μ sec 14 μ sec.