ECE - Questions and solutions set-old paper2

Electronics and communication Engineering Questions and solutions set-old paper2
Question:-
Option (A)
increases by 60 mV
Option (B)
decreases by 60 mV
Option (C)
increases by 25 mV
Option (D)
decreases by 25 mV
Correct Option:
D
Question Solution:
For Si forward bias voltage change by – 2.5 mv/°C
For 10°C increases, change will be – 2.5 x 10 = -25 mV
Question:-
Option (A)
0
Option (B)
1/10
Option (C)
4/5
Option (D)
1
Correct Option:
A
Question Solution:
= 0 (∴ Z2 + 4Z + 5 = (Z + 2)2 + 1 = 0)
Z = will be outside the unit circle
So that integration value is ‘zero’.
Question:-
Option (A)
6.4 – j4.8
Option (B)
6.56 – j7.87
Option (C)
10 + j0
Option (D)
16 + j0
Correct Option:
A
Question Solution:

=
Question:-
Option (A)
5 Ω
Option (B)
10 Ω
Option (C)
15 Ω
Option (D)
20 Ω
Correct Option:
C
Question Solution:
RL = Rth = 15 Ω