WBUT 2012: Communication Engineering and Coding Theory (Paper Code: CS-401)

CS/B.TECH (CSE(IT)New)/SEM-4/CS-401/2012

2012

COMMUNICATION ENGINEERING AND CODING THEORY

Time Allotted : 3 Hours                                              Full Marks : 70

The figures in the margin indicate full marks.

Candidates are required to give their answers in their own words

as far as practicable.

GROUP – A

(Multiple Choice Type Question)

1.       Choose the correct alternatives for the following:     10 x 1 = 10

          i)       Intermediate frequency of standard AM receiver system is

                   a)      500 kHz                        b)      555 kHz

                   c)      455 kHz                        d)      450 kHz

          ii)      An analog signal is quantized using L levels, the signal to quantization noise ratio varies

                   a)      directly with L              b)      directly with L²

                   c)      directly with L³             d)      none of these.

          iii)     If a source produces five symbols with probabilities 1/2 , 1/4 , 1/8 , 1/16 and 1/16 , then the source entropy H(x) is

                   a)      3 b/symbols                  b)      5.5 b/symbols

                   c)      2.875 b/symbols          d)      1.875 b/symbols.