Digital Arithmetic Operations and Circuits Questions and Answers

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Q1
For a 4-bit parallel adder, if the carry-in is connected to a logical HIGH, the result is:
  • A the same as if the carry-in is tied LOW since the least significant carry-in is ignored.
  • B that carry-out will always be HIGH.
  • C a one will be added to the final result.
  • D the carry-out is ignored.
Answer: Option C
Q2
What is the first thing you will need if you are going to use a macrofunction?
  • A A complicated design project
  • B An experienced design engineer
  • C Good documentation
  • D Experience in HDL
Answer: Option C
Q3
Solving –11 + (–2) will yield which two's-complement answer?
  • A 1110 1101
  • B 1111 1001
  • C 1111 0011
  • D 1110 1001
Answer: Option C
Q4
Solve this BCD problem: 0100 + 0110 =
  • A 00010000BCD
  • B 00010111BCD
  • C 00001011BCD
  • D 00010011BCD
Answer: Option A
Q5
What are constants in VHDL code?
  • A Fixed numbers represented by a name
  • B Fixed variables used in functions
  • C Fixed number types
  • D Constants do not exist in VHDL code.
Answer: Option A
Q6
The most commonly used system for representing signed binary numbers is the:
  • A 2's-complement system.
  • B 1's-complement system.
  • C 10's-complement system.
  • D sign-magnitude system.
Answer: Option A
Q7
What is the major difference between half-adders and full-adders?
  • A Nothing basically; full-adders are made up of two half-adders.
  • B Full adders can handle double-digit numbers.
  • C Full adders have a carry input capability.
  • D Half adders can handle only single-digit numbers.
Answer: Option C
Q8
The decimal value for E16 is:
  • A 1210
  • B 1310
  • C 1410
  • D 1510
Answer: Option C
Q9
Fast-look-ahead carry circuits found in most 4-bit full-adder circuits:
  • A determine sign and magnitude
  • B reduce propagation delay
  • C add a 1 to complemented inputs
  • D increase ripple delay
Answer: Option B
Q10
The binary subtraction 0 – 0 =
  • A difference = 0 borrow = 0
  • B difference = 1 borrow = 0
  • C difference = 1 borrow = 1
  • D difference = 0 borrow = 1
Answer: Option A

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