Electronics and Communication Engineering - Exam Questions Papers

21. 

Separation property of state-transition matrix is

A. φ(t - t0) = φ(t) φ(t0)
B. φ(t - t0) = φ-1(t) φ-1(t0)
C. φ(t - t0) = φ(t) φ-1(t0)
D. φ(t - t0) = φ-1(t) φ-1(t0)

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

22. 

In a conventional AM superhetrodyne receivers, the detectors employed to extract intelligence include

A. Peak detectors
B. Ratio detectors
C. PLL
D. Slope detectors

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

23. 

Assertion (A): The h-parameter model of a BJT can be derived from its hybrid-p model and vice-versa.

Reason (R): The hybrid-p model has many more additional elements as compared to h-parameter model of the BJT.

A. Both A and R are individually true and R is the correct explanation of A
B. Both A and R are individually true but R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

24. 

The input to a binary communication system, denoted by a random variable x, takes on one of the two values 0 or 1 with probabilities and . The behaviour of the communication system is modelled by
P(Y = 1 |x = 1|) = and P(Y = 0|x = 0) =
P(x = 1|y = 1) =

A.
B.
C. 1
D.

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

25. 

The signal flow graph of a system is shown below:

The transfer of the system is

A.
B.
C.
D.

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.