Digital Arithmetic Operations and Circuits Questions and Answers
Digital Arithmetic Operations and Circuits play an essential role in programming questions and answers related to computer architecture and electronics. This topic covers binary addition, subtraction, multiplication, division, and their implementation using combinational circuits like adders and multiplexers. Understanding these fundamentals helps candidates prepare for GATE, ISRO, and DRDO exams where logic design questions are common. Practicing digital electronics MCQs and circuit-based problems improves analytical skills and strengthens the foundation for embedded and VLSI design interviews.
Digital Arithmetic Operations and Circuits
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92 questions
41. An input to the mode pin of an arithmetic/logic unit (ALU) determines if the function will be:
- one's-complemented
- arithmetic or logic
- positive or negative
- with or without carry
42. Could the sum output of a full-adder be used as a two-bit parity generator?
- TRUE
- FALSE
43. In VHDL, what is a GENERATE statement?
- The start statement of a program
- Not used in VHDL or ADHL
- A way to get the computer to generate a program from a circuit diagram
- A way to tell the compiler to replicate several components
44. Binary subtraction of a decimal 15 from 43 will utilize which two's complement?
- 101011
- 110000
- 011100
- 110001
45. Which of the following is the primary advantage of using binary-coded decimal (BCD) instead of straight binary coding?
- Fewer bits are required to represent a decimal number with the BCD code.
- BCD codes are easily converted from decimal.
- the relative ease of converting to and from decimal
- BCD codes are easily converted to straight binary codes.
47. The carry propagation delay in full-adder circuits:
- is normally not a consideration because the delays are usually in the nanosecond range.
- decreases in a direct ratio to the total number of FA stages.
- is cumulative for each stage and limits the speed at which arithmetic operations are performed.
- increases in a direct ratio to the total number of FA stages but is not a factor in limiting the speed of arithmetic operations.
48. What is the difference between a full-adder and a half-adder?
- Half-adder has a carry-in.
- Full-adder has a carry-in.
- Half-adder does not have a carry-out.
- Full-adder does not have a carry-out.
49. The summing outputs of a half- or full-adder are designated by which Greek symbol?
- omega
- theta
- lambda
- sigma
50. The BCD addition of 910 and 710 will give initial code groups of 1001 + 0111. Addition of these groups generates a carry to the next higher position. The correct solution to this problem would be to:
- ignore the lowest order code group because 0000 is a valid code group and prefix the carry with three zeros
- add 0110 to both code groups to validate the carry from the lowest order code group
- disregard the carry and add 0110 to the lowest order code group
- add 0110 to the lowest order code group because a carry was generated and then prefix the carry with three zeros