# Electronics and Communication Engineering

MCQsQuestion.com has 3766 Question/Answers about Topic Electronics and Communication Engineering

## Pick the odd one

- A. variance
- B. standard deviation
- C. expectation
- D. chebyshev inequality
- Correct Answer: Option D

## which of the following is not correct?

- A. P() = P(A) - 1
- B. 0 ≤ P ≤ 1
- C. If A and B are mitual exclusive then P(A + B) = P(A) + P(B)
- D. P() = 1 - P(A)
- Correct Answer: Option A

## Transfer function of a linear system is 200 e-j10ω The system is a

- A. distortionless Attenuator
- B. amplifier with Phase distortion
- C. distortionless Amplifier
- D. attenuator with Phase distortion
- Correct Answer: Option C

## An energy signal has G(f) = 10. Its energy density spectrum is

- A. 10
- B. 100
- C. 50
- D. 20
- Correct Answer: Option B

## A linear system is characterized by H(ω) = Be-2ω2 the system is physically

- A. unrealizable
- B. realizable
- C. depends upon B
- D. depends upon constant 2
- Correct Answer: Option A

## Two function g1(t) and g2(t) with correlation of 6 has average power of 4 and 5 respectively. The power of g1(t) + g2(t) is

- A. 9
- B. 21
- C. 3
- D. 15
- Correct Answer: Option B

## Let f1(t) = G1(t) + 4, f2(t) = G2(t) + 3. If G1(t) and G2(t) are uncorrected then the correlation between f1(t) and f2(t) are

- A. 12
- B. 7
- C. 6
- D. zero
- Correct Answer: Option D

## The energy of highest value of Autocorrelation of a function 100 cos 50 pt is

- A. 50
- B. 10
- C. 200
- D. zero
- Correct Answer: Option B

## Highest value of Autocorrelation of a function 100 cos 50 pt is

- A. 50
- B. 100
- C. zero
- D. 100/
- Correct Answer: Option B

## Highest value of autocorrelation function 100 sin 50 pt is

- A. 50
- B. zero
- C. 100
- D. 100/
- Correct Answer: Option B

## A rectangular pulse is passed through an L.P.F. The response is a

- A. triangular
- B. trapezoidal function
- C. sampling
- D. Both (a) and (b)
- Correct Answer: Option A

## Following is a reason of distortion in communication system

- A. external interference
- B. random variations
- C. insufficient Channel Bandwidth
- D. all
- Correct Answer: Option D

## In a oscillator, a sine wave generator starts at t = 0. It consist of

- A. Pure sine wave
- B. Pure cosine wave
- C. Unity for t > 0
- D. 2∪(t) - 1
- Correct Answer: Option A

## In a Communication system, noise is most likely to affect the signal.

- A. at the transmitter
- B. In the channel
- C. in Information source
- D. at the destination
- Correct Answer: Option B

## A signum function is

- A. zero for t greater than zero
- B. zero for t less than zero
- C. unity for t greater than zero
- D. 2∪(t) - 1
- Correct Answer: Option D