# Digital Communication - Electronic Engineering (MCQ) questions & answers

Dear Readers, Welcome to Digital Communication multiple choice questions and answers with explanation. These objective type Digital Communication questions are very important for campus placement test, semester exams, job interviews and competitive exams like GATE, IES, PSU, NET/SET/JRF, UPSC and diploma.

Specially developed for the Electronic Engineering freshers and professionals, these model questions are asked in the online technical test and interview of many companies.

These tutorial are also important for your viva in university exams like Anna university, Pune, VTU, UPTU, CUSAT etc.

1)   Graphical representation of linear block code is known as
- Published on 04 Nov 15

a. Pi graph
b. Matrix
c. Tanner graph
d. None of the above
 Answer  Explanation  Related Ques ANSWER: Tanner graph Explanation: No explanation is available for this question!

2)   A linear code
- Published on 04 Nov 15

a. Sum of code words is also a code word
b. All-zero code word is a code word
c. Minimum hamming distance between two code words is equal to weight of any non zero code word
d. All of the above
 Answer  Explanation  Related Ques ANSWER: All of the above Explanation: No explanation is available for this question!

3)   For decoding in convolution coding, in a code tree,
- Published on 04 Nov 15

a. Diverge upward when a bit is 0 and diverge downward when the bit is 1
b. Diverge downward when a bit is 0 and diverge upward when the bit is 1
c. Diverge left when a bit is 0 and diverge right when the bit is 1
d. Diverge right when a bit is 0 and diverge left when the bit is 1
 Answer  Explanation  Related Ques ANSWER: Diverge upward when a bit is 0 and diverge downward when the bit is 1 Explanation: No explanation is available for this question!

4)   The code in convolution coding is generated using
- Published on 04 Nov 15

a. EX-OR logic
b. AND logic
c. OR logic
d. None of the above
 Answer  Explanation  Related Ques ANSWER: EX-OR logic Explanation: No explanation is available for this question!

5)   Interleaving process permits a burst of B bits, with l as consecutive code bits and t errors when
- Published on 04 Nov 15

a. B ≤ 2tl
b. B ≥ tl
c. B ≤ tl/2
d. B ≤ tl
 Answer  Explanation  Related Ques ANSWER: B ≤ tl Explanation: No explanation is available for this question!

6)   For a (7, 4) block code, 7 is the total number of bits and 4 is the number of
- Published on 04 Nov 15

a. Information bits
b. Redundant bits
c. Total bits- information bits
d. None of the above
 Answer  Explanation  Related Ques ANSWER: Information bits Explanation: No explanation is available for this question!

7)   Parity bit coding may not be used for
- Published on 04 Nov 15

a. Error in more than single bit
b. Which bit is in error
c. Both a & b
d. None of the above
 Answer  Explanation  Related Ques ANSWER: Both a & b Explanation: No explanation is available for this question!

8)   Parity check bit coding is used for
- Published on 04 Nov 15

a. Error correction
b. Error detection
c. Error correction and detection
d. None of the above
 Answer  Explanation  Related Ques ANSWER: Error detection Explanation: No explanation is available for this question!

9)   For hamming distance dmin and t errors in the received word, the condition to be able to correct the errors is
- Published on 04 Nov 15

a. 2t + 1 ≤ dmin
b. 2t + 2 ≤ dmin
c. 2t + 1 ≤ 2dmin
d. Both a and b
 Answer  Explanation  Related Ques ANSWER: Both a and b Explanation: No explanation is available for this question!

10)   For hamming distance dmin and number of errors D, the condition for receiving invalid codeword is
- Published on 04 Nov 15

a. D ≤ dmin + 1
b. D ≤ dmin - 1
c. D ≤ 1 - dmin
d. D ≤ dmin
 Answer  Explanation  Related Ques ANSWER: D ≤ dmin - 1 Explanation: No explanation is available for this question!

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