Combinational Circuits

Question 31

A ROM is used to store the table for multiplication of two 8-bit unsigned integers. The size of ROM required is  

• 256 x 16
• 64K x 8
• 4K x 16
• 64K x 16

Question 32

Consider the circuit given below which has a four bit binary number b₃b₂b₁b₀ as input and a five bit binary number d₄d₃d₂d₁d₀ as output. The circuit implements:               .

• Binary to Hex conversion
• Binary to BCD conversion
• Binary to grey code conversion
• Binary to radix-12 conversion

Question 33

Consider the circuit in below figure. f implements

• (ABC)\' + A\'BC\' + ABC
• A + B + C
• A ⊕ B ⊕ C
• AB + BC + CA

Question 34

A logic network has two data inputs A and B, and two control inputs C₀ and C₁. It implements the function F according to the following table.         . Implement the circuit using one 4 to 1 Multiplexer, one 2-input Exclusive OR gate, one 2-input AND gate, one 2-input OR gate and one Inverter.

Question 35

The output of the following combinational circuit is F. The value of F is:

• P₁+P^\'₂P₃
• P₁+P^\'₂P^\'₃
• P₁+P₂P^\'₃
• P^\'₁+P₂P₃

Question 36

The output of the following combinational circuit is F. The value of F is :

• P₁+P^\'₂P₃
• P₁+P^\'₂P^\'₃
• P₁+P₂P^\'₃
• P^\'₁+P₂P₃

Question 37

A 32 bit adder is formed by cascading 4 bit CLA adder. The gate delays (latency) for getting the sum bits is

• 16
• 18
• 17
• 19

Question 38

When two n-bit binary numbers are added the sum will contain at the most

• n bits
• (n + 3) bits
• (n + 2) bits
• (n + 1) bits

Question 39

The dynamic hazard problem occurs in

• combinational circuit alone
• sequential circuit only
• Both (a) and (b)
• None of the above

Question 40

The Excess-3 code is also called

• Cyclic Redundancy Code
• Weighted Code
• Self-Complementing Code
• Algebraic Code