Sdsf
Christ College of Engineering and Technology
Puducherry – 10
Department of Electronics and Communication Engineering
Digital Circuits
2 Mark - Question and Answer
1. Define binary logic?
Binary logic consists of binary variables and logical operations. The variables aredesignated by the alphabets such as A, B, C, x, y, z, etc., with each variable having only twodistinct values: 1 and 0. There are three basic logic operations: AND, OR, and NOT.
2. What are the basic digital logic gates?
The three basic logic gates areAND gateOR gateNOT gate
3. What is a Logic gate?
Logic gates are the basic elements that make up a digital system. The electronic gateis a circuit that is able to operate on a number of binary inputs in order to perform aparticular logical function.
4. Define combinational logic
When logic gates are connected together to produce a specified output for certainspecified combinations of input variables, with no storage involved, the resulting circuit iscalled combinational logic.
5. Explain the design procedure for combinational circuits
The problem definition
Determine the number of available input variables & required O/P variables.
Assigning letter symbols to I/O variables
Obtain simplified Boolean expression for each O/P.
Obtain the logic diagram.
6. Define Half adder and full adder
The logic circuit that performs the addition of two bits is a half adder. The circuit thatperforms the addition of three bits is a full adder.
7. Define Decoder?
A decoder is a multiple - input multiple output logic circuit that converts coded inputs into coded outputs where the input and output codes are different.
8. What is binary decoder?
A decoder is a combinational circuit that converts binary information from n inputlines to a maximum of 2nout puts lines.
9. Define Encoder?
An encoder has 2ninput lines and n output lines. In encoder the output lines generatethe binary code corresponding to the input value.
10. What is priority Encoder?
Puducherry – 10
Department of Electronics and Communication Engineering
Digital Circuits
2 Mark - Question and Answer
1. Define binary logic?
Binary logic consists of binary variables and logical operations. The variables aredesignated by the alphabets such as A, B, C, x, y, z, etc., with each variable having only twodistinct values: 1 and 0. There are three basic logic operations: AND, OR, and NOT.
2. What are the basic digital logic gates?
The three basic logic gates areAND gateOR gateNOT gate
3. What is a Logic gate?
Logic gates are the basic elements that make up a digital system. The electronic gateis a circuit that is able to operate on a number of binary inputs in order to perform aparticular logical function.
4. Define combinational logic
When logic gates are connected together to produce a specified output for certainspecified combinations of input variables, with no storage involved, the resulting circuit iscalled combinational logic.
5. Explain the design procedure for combinational circuits
The problem definition
Determine the number of available input variables & required O/P variables.
Assigning letter symbols to I/O variables
Obtain simplified Boolean expression for each O/P.
Obtain the logic diagram.
6. Define Half adder and full adder
The logic circuit that performs the addition of two bits is a half adder. The circuit thatperforms the addition of three bits is a full adder.
7. Define Decoder?
A decoder is a multiple - input multiple output logic circuit that converts coded inputs into coded outputs where the input and output codes are different.
8. What is binary decoder?
A decoder is a combinational circuit that converts binary information from n inputlines to a maximum of 2nout puts lines.
9. Define Encoder?
An encoder has 2ninput lines and n output lines. In encoder the output lines generatethe binary code corresponding to the input value.
10. What is priority Encoder?