# Digital logic design (DLD) all previous/ past question papers

-Digital logic design (DLD) –Computer Science all subject past paper Digital logic design (DLD) –Computer Graphics Course – (DLD)Project idea -Digital logic design (DLD) MCQ -Digital logic design (DLD) Interview Question –Computer Science all courses -Technology –University Past Paper -Programming language –Question paper –old paper

## Digital logic design (DLD) Mid term Examination 2021

__Q.No.1__

(A) A hexadecimal odometer displays F5EC.what are the next 7 readings?

(B) A microcomputer has memory locations from 000 to 0FF.each memory location stores 1 bytes. In decimal, how many bites can the microcomputer store in its memory?

(c) Implement y=AB+CD using NOR gates only.

(d) An XOR gate has 6 inputs. How many input words are in its truth table?

(E) Why the gates are called decision making elements? How many inputs signal can a gate have?

(F) What are the fundamental product for each of the input words ABCD=0010,ABCD=1101 AND ABCD=1100.

(G) Why the gates are called decisions making elements? How many input signal can a gate have? How many output signals?

(H) What is meant by universal gate? What is the main difference between inverter and controlled inverter? Show the circuit diagram of a controlled inverter.

(I) Convert (21+your own registration number) into binary, octal and hexadecimal number system. The input is in decimal format.

(J) Reconvert the answer of above part (1) back into decimal.

__Q.No.2__

Draw the circuit diagram of a decimal to binary encoder.

__Q.No.3__

Design the circuit diagram of a grey code to binary converter.

__Q.No.4__

Differentiate between half adder, full adder and binary adder. Implement the circuit diagram of a full adder starting from truth table.

__Q.No.5__

A truth table has four inputs variables. The first eight outputs are 0’s and the last eight output are 1’s.draw the k-Map and write down the simplified expression

__GOOD LUCK__

### Digital logic design (DLD) paper 2 2020

**Q1:**

- B) Differentiate between logic gates(AND,NAND,OR,NOR) with circuit diagram and truth table.

**Q2:** How can we detect an error in the given data bits?

7 bits of data | (counts of 1 bits) | Even | Odd |

0000011 | |||

1010111 | |||

1101001 | |||

1111001 |

**Q3**: Simplify the Product-Of-Sums Boolean Expression below, providing a result in SOP form.

**Q4:** What is the difference between full Subtractor and Half Adder? Draw the logical circuit diagram of full subtractor only?

**Q5:** Minimize Boolean expression F= (0,1,2,3,5,7,8,10,14,15) +d(4,6) by using quine mccluskey method/tabulation method?

### DLD paper 3 2020

**Q1:**

- A hexadecimal odometer displays F5EC. What are the next 7 reading?
- A microcomputer has memory locations from 000 to 0FF. Each memory location stores 1 byte. In decimal, how many bites can the microcomputer store in its memory?
- Implement Y= AB + CD using NOR gates only.
- An XOR gate has 6 inputs. How many input words are in its truth table?
- Why the gates are called decision making elements? How many input signals can a gate have?
- What are the fundamental product for each of the input words ABCD = 0010, ABCD = 1101 and ABCD = 1100?
- Why the gates are called decision making elements? How many input signals can a gate have? How many output signals?
- What is meant by universal gate?

What is the main difference between inverter and controller inverter? Show the circuit diagram of a controlled inverter?

- Convert (21+your own registration number) into binary, octal and Hexadecimal number system. The input is in decimal format?
- Reconvert the answers of the above part (1) back into decimal?

**Q2:** Draw the circuit diagram of the decimal to binary encoder?

**Q3:** Design the circuit diagram of a grey code to binary converter?

**Q4:** Differentiate between half adder, full adder and binary adder. Implement the circuit diagram of a full adder starting from truth table?

**Q5:** A truth table has four input variables. The first eight outputs are 0’s and the last eight output are 1’s. Draw the K-Map and write down the simplified expression?

### DLD Paper 4 2019

**Q1:**

a) A hexadecimal odometer displays FSEC. What are the next 7 readings?

b) A microcomputer has memory locations from 00 to OFF. Each memory location stores I byte. In decimal, how many bites can the microcomputer store in its memory”

c) Implement Y – AB + CD using NOR gates only.

d) An XOR gate has 6 inputs. How many input words are in its truth table?

Why the gates are called decision making elements? How many input signals can a gate have?

What are the fundamental product for each of the input words ABCD – 0010, ABCD = 1101 and ABCD

– 1100.

Why the gates are called decision making elements? How many input signals can a gate have? How many

output signals?

What is meant by universal gale?

What as the main difference between inverter and controlled inverter? Show the circuit diagram

or a controlled inverter.

P Convert (21 – your own registration number) into binary, octal and Hexadecimal number system The input 1s in decimal format.

Reconvert the answers of above part (i) back into decimal.

**Q2:** Draw the circuit diagram of a decimal to binary encoder.

**Q3**: Design the circuit diagram of a grey code to binary converter.

**Q4:** Differentiate between half adder, full adder and binary adder. Implement the circuit diagram of a full adder starting from truth table.

**Q5:** A, truth table has four input variables. The first eight outputs are O’s and the last eight output are Is.

Draw the K-Map and write down the simplified expression.

### DLD Paper 5 2019

DLD paper 6 2018

### DLD paper 7 2018

#Digital logic design (DLD) #Computer Science all subject past paper Digital logic design (DLD) #Computer Graphics Course # (DLD)Project idea #Digital logic design (DLD)MCQ #Design Digital logic design (DLD) Interview Question #Computer Science all courses #Technology #University Past Paper #Programming language #Question paper #old paper