Top 150+ Solved Communication Engineering MCQ Questions Answer
Q. Frequency modulation index defines the relationship between the and bandwidth of transmitted signal.
a. frequency of message signal
b. amplitude of message signal
c. amplitude of carrier signal
d. frequency of carrier signal
Q. Which of the following are two methods for generating FM signal?
a. coherent method, noncoherent method
b. product detector, envelope detector
c. direct method, indirect method
d. slope detector, zero crossing detector
Q. If the channel is noiseless information conveyed is and if it is useless channel information conveyed is
a. 0,0
b. 1,1
c. 0,1
d. 1,0
Q. The mutual information between a pair of events is
a. positive
b. negative
c. zero
d. all of the mentioned
Q. In which waveform logic 1 is represented by equal amplitude alternating pulses?
a. unipolar rz
b. bipolar rz
c. rz-ami
d. manchester coding
Q. The signals which are obtained by encoding each quantized signal into a digital word is called as
a. pam signal
b. pcm signal
c. fm signal
d. sampling and quantization
Q. The length of the code-word obtained by encoding quantized sample is equal to
a. l=log(to the base 2)l
b. l=log(to the base 10)l
c. l=2log(to the base 2)l
d. l=log(to the base 2)l/2
Q. In PCM encoding, quantization level varies as a function of
a. frequency
b. amplitude
c. square of frequency
d. square of amplitude
Q. What is bit depth?
a. number of quantization level
b. interval between two quantization levels
c. number of possible digital values to represent each sample
d. none of the mentioned
Q. Choosing a discrete value that is near but not exactly at the analog signal level leads to
a. pcm error
b. quantization error
c. pam error
d. sampling error
Q. In PCM the samples are dependent on
a. time
b. frequency
c. quanization leavel
d. interval between quantization level
Q. DPCM encodes the PCM values based on
a. quantization level
b. difference between the current and predicted value
c. interval between levels
d. none of the mentioned
Q. Adaptive DPCM is used to
a. increase bandwidth
b. decrease bandwidth
c. increase snr
d. none of the mentioned