Digital Electronics Questions with Answers Set-1

1. Multiplexer means __________.

2. Which gate is known as universal gate?

3. The format of the single-precision floating-point representation of a real number as per the IEEE 754 standard is as follows:

Sign

exponent

mantissa

Which one of the following choices is correct with respect to the smallest normalized positive number represented using the standard?

4. Consider an operation of adition. For two numbers, thhe operating will generate a sum. If the operand are strings, and the sam eoperation would produce a third string by concatenation. This features is called __________.

5. Which one of the following circuits implements the Boolean function given below?
$f(x,y,z)=m_0+m_1+m_3+m_4+m_5+m_6,where m_i is the i^th$ minterm.

6. Let the representation of a number in base 3 be 210. What is the hexadecimal representation of the number?

7. A combinational logic circuit that is used to send data coming from a single source to two or more separate destinations is called as_________.

8. Which of the following is a universal gate?

9. The two's compliment of binary number 010111.1100 is__________.

10. Consider a 3-bit counter, designed using T flip-flops, as shown below:Assuming the initial state of the counter given by PQR as 000, what are the next three states?

11. Which of the following decimal numbers is represented by the binary number $1001.01_{2}$?   

12. Consider the Boolean function z(a, b, c).

Which one of the following lists represents the circuit given above?

13.

Consider three registers R1, R2, and R3 that store numbers in IEEE-754 single precision floating point format. Assume that R1 and R2 contain the values (in hexadecimal notation) 0x42200000 and 0xC1200000, respectively.

If $R3\frac{R1}{R2}$, what is the value stored in R3?

14. Which will be the decimal equivalent of the octal number $157_{8}$?

15. Consider the following Boolean expression.

$F=\left (X+Y+Z \right )\left ({X}'+Y \right )\left ( {Y}'+Z\right )$

Which of the following Boolean expressions is/are equivalent to F (Complement of F)?

16. Choose the correct choice(s) regarding the following propositional logic assertion S :

$S:((P\wedge Q\rightarrow R)\rightarrow (P\wedge Q)\rightarrow (Q\rightarrow R))$

 

17. Name the location where the operands of the zero-address instruction method get stored.

18. If x and y are two decimal digits and $(0.1101)_{2}=(0.8xy5)_{10}$ the decimal value of x+y is

19. Consider the following representation of a number in IEEE single-precision floating-point format with a bias of 127.

S:1     E:10000001 F:11110000000000000000000

Here S, E and F denote the sign, exponent and fraction components of the floating-point representation.

The decimal value corresponding to the above representation (rounded to 2 decimal places)

Is__

20. Consider a Boolean function f(w,x,y,z) such that
f(w,0,0,z) =1
f(1,x,1,z)=x+z
f(w,1,y,z)=wz+y
The number of literals in the minimal sum-of-products expression of f is_______