Two Marks Questions with Answers

Two Marks Questions with Answers

 

Q.1 What is meant by weighted and non-weighted coding ?

Ans. : Weighted codes : In weighted codes, each digit position of the number represents a specific weight. For example, in decimal code, if number is 567 then weight of 5 is 100, weight of 6 is 10 and weight of 7 is 1. In weighted binary codes each digit has a weight 8, 4, 2 or 1. The codes 8421, 2421 and 5211 are all weighted codes. (Refer Tables 1.7.1, 1.7.3 and 1.7.5)

Non-weighted codes : Non-weighted codes are not assigned with any weight to each digit position, i.e., each digit position within the number is not assigned fixed value. Excess-3 and gray codes are the non-weighted codes.

 

Q. 2 Encode the ten decimal digits in the 2 out of 5 code. AU : CSE : Dec.-02

(Refer section 1.7.6)               

 

Q. 3 Show that the excess-3 code is self-complementing. AU : CSE : Dec.-02, May-03

(Refer section 1.7.4)      

 

Q. 4 What are the different ways to represent a negative number ?

(Refer section 1.4)

 

Q.5 What is the advantage of gray codes over the binary number sequence ?

(Refer section 1.7.5)

 

Q. 6 What are error detecting codes?

AU : CSE : May-07

 (Refer section 1.8)

 

Q. 7 Perform subtraction using l's complement

 (10000)₂ – (10000) ₂

AU : CSE : Dec.-09

Ans :

 

Q. 8 Perform 9's and 10's complement subtraction between 18 and - 24.

(Refer example 1.7.9)

 

Q. 9 Convert the (153.513)₁₀ to Octal.

(Refer example 1.3.16)

 

Q. 10 Find the octal equivalent of hexadecimal number AB.CD

Ans : (231 . 4065)₈

 

Q. 11 Represent the decimal numbers - 200 and 200 using 2's complement binary form.

(Refer example 1.4.3)

AU : CSE : May-11

 

Q. 12 Perform the following code conversions :

(1010.10)₁₆ → (?)₂ → (?)₂ → (?)₁₀

AU : CSE : Dec.-ll

Ans. :

(1000000010000.0001)₂, (10020.02) ₈, (4112.0625) ₁₀

 

Q.13 Subtract 11001 from 01101 using 2's complement.

AU : CSE : Dec.-11

Ans. :          1100.

 

Q.14 Convert (2. B2)₁₆ to binary and octal numbers.

Ans . :

 

Q.15 Using 2’s complement perform (6)₁₀ - (3)₁₀

AU : CSE : May-11

 

Q.16 Write the application of gray code. AU : CSE : May-12

(Refer section 1.7)

 

Q.17 Convert: a) (475.25)₈ to its decimal equivalent.

(Refer section 1.2.3) b) (549.B4)₁₆ to its decimal equivalent.

(Refer example 1.3.4)

 

Q. 18 What is an unit distance code ? Give an example.

(Refer section 1.7.5)

AU : Dec.-15

 

Q.19 What is a gray code and mention its advantages ?

[Section 1.7.5]