Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Multiple Choice Questions
Q391: What is the primary advantage of the Group-Carry Look-Ahead in ALUs?
- A: It speeds up the carry propagation
- B: It reduces the size of the ALU
- C: It simplifies the ALU design
- D: It allows for more operations in one ALU unit
View Answer
A
Q392: How does the 74XX181 ALU differ from the 74XX381 ALU?
- A: It has more function select inputs
- B: It provides ripple carry outputs
- C: It has fewer arithmetic functions
- D: It is only for 8-bit operations
View Answer
A
Q393: What is the purpose of using an 8-bit Adder/Subtracter Circuit?
- A: To handle addition and subtraction of 8-bit numbers
- B: To handle multiplication operations
- C: To handle both 4-bit and 8-bit numbers
- D: To simplify complex arithmetic operations
View Answer
A
Q394: Which ALU in a 16-bit ALU configuration generates Carry Out 8?
- A: ALU0
- B: ALU1
- C: ALU2
- D: ALU3
View Answer
B
Q395: How many ALUs are used to implement a 16-bit ALU without Look-Ahead Carry?
- A: 2
- B: 3
- C: 4
- D: 5
View Answer
C
Q396: What is the purpose of the Look-Ahead Carry Generator in a 16-bit ALU?
- A: To increase delay
- B: To eliminate carry propagation delay
- C: To add extra ALUs
- D: To generate extra outputs
View Answer
B
Q397: What does the G output of a 4-bit ALU indicate?
- A: Carry In is zero
- B: Carry Out is zero
- C: Carry Out is generated regardless of Carry In
- D: Carry is generated only if Carry In is active
View Answer
C
Q398: What is the function of the P output in a 4-bit ALU?
- A: Indicates if Carry Out is generated regardless of Carry In
- B: Indicates if Carry Out is generated only if Carry In is active
- C: Indicates that no carry is generated
- D: Indicates that all carry inputs are inactive
View Answer
B
Q399: The simplest and most commonly used Decoders are the ______ Decoders
- A: n to 2n
- B: (n-1) to 2n
- C: (n-1) to (2n-1)
- D: n to 2n-1
View Answer
A
Q400: The _______ Encoder is used as a keypad encoder.
- A: 2-to-8 encoder
- B: 4-to-16 encoder
- C: BCD-to-Decimal
- D: Decimal-to-BCD Priority
View Answer
D