University of Mumbai 2009-1st Sem B.Sc Information Technology (IT) Introduction to Digital Electronics - Question Paper

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N. B. : (1) Question No. 1 is compulsory.

(2)    Attempt any four questions from the remaining.

(3)    All questions carry equal marks.

1.    (a) Write the binary digits used to record the word BASE in BCD.

(b)    Find the decimal equivalent of the binary number 110*101

(c)    Find the decimal equivalent of the octal number 127-54.

(d)    Find the decimal equivalent of the hexadecimal number 2B. C4.

2.    (a) Define the term 'byte'. What is the difference between a bit and a byte ?

(b)    Write 4 bit BCD code for the following numbers :

(a)25₁₀ (b) 128₁₀

(c)    Write short notes on :

(a) Gray Code (b) Excess-3 Code.

(d)    Convert 11010011₂ to base 10.

3.    (a) Subtract 56₁₀ from 92₁₀ using complementary method.

(b)    Subtract 0111000₂ from 1011100₂.

(c)    Multiply binary numbers 1010 and 1001.

(d)    Divide 100001₂ by 110₂.

(e)    Explain how multiplication and division operations are performed in a computer by using additive approach ?

4.    (a) Construct a logic circuit for the boolean expression (i) A-B+C (ii) A-B + C-D + E-F

(b) Construct a logic circuit for the boolean expression A-B+C. (A+B-D) using NAND

gates only.

5.    Write short notes on : Explain with diagram.

(i)    Half adder

(ii)    Full adder

(iii)    Multiplexer.

Attachment: university-of-mumbai-2009-b-sc-information-technology-51551-1.pdf

Earning:   Approval pending.