Electronics and Communication Engineering - Exam Questions Papers

31. 

The function shown in figure, can represent a probability density function for A __________ .

A. A = 1/4
B. A = 1/6
C. A = 1/8
D. A = 1/2

Answer: Option C

Explanation:

The condition for the probability density of function d(x) is f(x)dx = 1 and is always non negative or the area under the curve f(x) is unity.

⇒ A x 6 + x 2 x 2A = 1

or 8A = 1, or A = .


32. 

For the circuit shown in figure below, the initial conditions are zero, its transfer function H(s) = is :

A.
B.
C.
D.

Answer: Option B

Explanation:

.


33. 

For the two-port network shown below, the short circuit admittance parameter matrix is

A.
B.
C.
D.

Answer: Option A

Explanation:


34. 

The circuit given below:

If R1 = R2 = 20 kΩ and C1 = 0.2 μF and C2 = 0.005 μF. Then which of the given statements given below is true?

A. Circuit is band stop with two edge frequency of 39.7875 Hz to 1592 Hz
B. Circuit is band pass with two edge frequency of 39.7875 Hz to 1592 Hz
C. Circuit is oscillator, oscillation at two frequencies 39.7875 Hz to 1592 Hz depending on R3, R4, R5 and R6
D. None of these

Answer: Option B

Explanation:

= 39.7875 Hz.

= 15.92 Hz.


35. 

The Nyquist sampling rate for the signal s(t) = is given by

A. 400 Hz
B. 600 Hz
C. 1200 Hz
D. 1400 Hz

Answer: Option C

Explanation:

fs = 2fm