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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 17
16.
A message signal x(t) is amplitude modulated with carrier c(t).
x(t) = 2 sin 600pt
c(t) = 8 cos (2p x 106 t)
such that the modulated signal is
(8 + 2 sin 600pt) [cos 2p x 106 t]
The total side band power is:
2ω
3ω
1ω
0.5ω
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
The cross section of a JFET is shown in the following figure. Let Va be - 2 V and let Vp be the initial pinch-off voltage. If the width W is doubled (with other geometrical parameters and doping levels remaining the same), then the ratio between the mutual transconductances of the initial and the modified JFET is
4
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
Simplify : A + B + A B + (A + B)AB + C(B + AB)
B + A
C
C
1
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
Which one of the following driving point functions does not represent an LC network?
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
A 2 μF capacitor is shunted by a 1 kΩ maintained at temperature 400 K. The rms noise voltage across the capacitor over the entire frequency band is:
6.25 x 10-8 V
5.25 x 10-6 V
6.25 x 10-6 V
5.25 x 10-8 V
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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