MCQs on Digital Electronics

01․ The decimal equivalent of hexadecimal number “BEED” is

(BEED)₁₆=(11×16³+14×16²+14×16¹+13×16⁰)₁₀ =(48,877)₁₀

02․ Which one of the following even parity codes are in errors. (I)100110010 (II)011101010 (III)10111111010001010

No. of 1’s in (I) is 4 i.e. even parity No. of 1’s in (II) is 5 i.e. not even parity(Error) No. of 1’s in (III) is 10 i.e. even parity

03․ Which of the following shows the correct attachment of even parity bit to the data 00001001?

As option (C) has 2 ones so it is even parity and by adding zero we extend the bit size of an even parity number.

04․ If in a base b number system, 54/4=13, the base of the number is

54/4 = 13 can be written as (5b+4)/4 = b+3 5b+4 = 4b+12 b = 8

05․ Consider the operation 24+17 = 40 .What is the correct base of number so that operation is correct?

24 + 17 = 40 this representation can be written as (2b + 4) + (b+7) = (4b + 0) B = 11

06․ 9’s complement of 52784630 is

07․ 10’s complement of 63325600 is

08․ 16’s complement of BABA is?

09․ A self-complementing code for the decimal digits is created using the weight 4 4 3 -2. The value of 8592 in the code is

Hence, (8592)₁₀ = (1100 1011 1111 1001)_443-2

10․ Which of the following BCD codes with an odd parity bit included in the end of code group, have error in the code? (I)1001010110000 (II)0100011101100 (III)0111110000011 (IV)1000011000101