Electronics and Communication Engineering - Exam Questions Papers
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1.
If X = 1 in the logic equation [X + Z { Y + (Z + X Y)}] { X + Z (X + Y)} = 1, then
Answer: Option
Explanation:
[1 + z{y + z + y}][0 + z] = 1, z = 1, z = 0.
2.
(22)4 + (101)3 - (20)5 = (x)4 + (4)x+1 where x > 4. The value of x is
Answer: Option
Explanation:
(22)4 + (10)10 - (10)10 = (22)4
Since x > 4, i.e. all the number systems with base greater than 4.
All these will contain symbol '4' which will have same value in all bases.
Converting 4 into base '4'
system (4)10
(10)4
Now (22)4 = (x)4 + (10)4
∴ (x)4 = (22)4 - (10)4 = (12)4
∴ x = 12.
3.
Consider a system with the transfer function
. Its damping ratio will be 0.5 when the value of k is :

Answer: Option
Explanation:
ξ = 0.5,
We take second term only
.
4.
For the system with given characteristic equation
s5 + 4s4 + 8s3 + 8s2 + 7s + 4 = 0
The number of roots on left hand side, right hand side and imaginary axis are respectively.
s5 + 4s4 + 8s3 + 8s2 + 7s + 4 = 0
The number of roots on left hand side, right hand side and imaginary axis are respectively.
Answer: Option
Explanation:
Apply Routh Hurwitz criteria.
5.
A series RLC circuit has a resonance frequency of 1 kHz and a quality factor Q = 100. If each of R, L and C is doubled from its original value, the new Q of the circuit is
Answer: Option
Explanation:
Resonant frequency
Quality factor =
where R, L, C all are doubled, then
.
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