Electronics and Communication Engineering - Exam Questions Papers
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21.
If the sequence
converges, then the series
converges absolutely is


Answer: Option
Explanation:
This is the Root test. Since the signal magnitude is raised to the power of 1/n.
22.
Open loop transfer function of a system is

The phase cross over frequency ωc is

The phase cross over frequency ωc is
Answer: Option
Explanation:
GH = - tan- 1 ω - tan- 1 2ω - tan- 1 3ω
= - p
tan- 1 ω + tan- 1 2ω = p - tan- 1 3ω
tan- l = p - tan- 1 3ω
= - 3ω
ω = 1 rad/sec.
23.
The two numbers represent in signed 2's complement form are P = 11101101 and Q = 111001110. If Q subtracted from P, the value obtained in signed 2's complement form is
Answer: Option
Explanation:
P = 11101101 = - 25
Q = 11100110 = - 18
Thus P - Q = - 25 - (- 18) = - 7
Thus '- 7's two complement representation is 11111001.
24.
The transfer function
of an RLC circuit is given by
quality factor (Q-factor) of this circuit is :


Answer: Option
Explanation:
.
25.
Consider the circuit shown below of 2 : 1 MUX is given by the function g = ac + bc

Then f is :

Then f is :
Answer: Option
Explanation:
Since g = ac + bc
i.e. when c = 0, g = b and c = 1, g = a
Now we evaluate
f = (E)(X) + (0)(X) = EX
f = (X)(Y) + (EX)(Y) = XY + EXY.
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