DIGITAL ELECTRONICS TEST

Question 1. Convert hexadecimal value 17 to decimal.

A. 23₁₀

B. 16₁₀

C. 10₁₀

D. 20₁₀

Question 2. Convert the following decimal number to 8-bit binary 178

A. 10111011₂

B. 11011101₂

C. 10110010₂

D. 10111100₂

Question 3. Convert binary 1001110010 to hexadecimal.

A. EE2₁₆

B. FF2₁₆

C. 2FE₁₆

D. 272₁₆

Question 4. Convert the following binary number to decimal. 011111

A. 11

B. 31

C. 15

D. 10

Question 5. Decode the following ASCII message.

1010011101010010101011000100101100101000001001000100000110100101000100

A. STUDYHARD

B. STUDY HARD

C. stydyhard

D. study hard

Question 6. Convert the decimal number 162.75 to binary.

A. 10100010.11

B. 11010011.01

C. 00111100.00

D. 10010111.11

Question 7. The number of bits used to store a BCD digit is:

A. 8

B. 4

C. 1

D. 2

Question 8. A number is represented in its 2's complement form as 1100111 what is its decimal value

A. -25

B. 25

C. 27

D. -27

Question 9. the parity bit to be added to the data 11110000001 to make it in to even parity

A. 1

B. 0

C. 3 1s

D. No need

Question 10. which of the following number system has two 0s

A. Sign magnitude form

B. 1's complement form

C. 2's complement form

D. None

Question 11. The gray code for the binary number 111001 is

A. 100101

B. 000101

C. 111010

D. None

Question 12. The Boolean expression suitable to the logic circuit is

A. A+c

B. A+C+B

C.

D. None

Question 13. If a 3-input NOR gate has eight input possibilities, how many of those possibilities will result in a HIGH output?

A. 1

B. 2

C. 7

D. 8

Question 14. If a signal passing through a gate is inhibited by sending a LOW into one of the inputs, and the output is HIGH, the gate is a(n):

A. AND

B. NAND

C. NOR

D. OR

Question 15. Which is correct grouping

A. A

B. B

C. C

D. D

Question 16. What logic function corresponds to the following circuit?

A. L = (S1 OR S2) AND (S3 OR S4).

B. L = S1 AND (S2 OR S3) AND S4

C. L = S1 OR (S2 AND S3) OR S4

D. L = (S1 OR S2) AND (S3 OR S4).

Question 17. number of switching functions of 3 variables is

A. 8

B. 64

C. 128

D. 256

Question 18. The Boolean expression can be minimized as

Question 19. the Boolean function AB + CD is to be realized using two input NAND gates. The minimum number of gates required is

A. 2

B. 3

C. 4

D. 5

Question 20. The logic expression is equal to

A. A+B

B. A+NOT B

C. A-B

D. NOT A + B