# Logic Design Questions and Answers – Design of Iterative Circuits

This set of Logic Design Multiple Choice Questions & Answers (MCQs) focuses on “Design of Iterative Circuits”.

1. Which of the following is an example of an iterative circuit?
b) ROM
c) Comparator

Explanation: An iterative circuit performs the same operation on each pair of input bits which is necessary for a comparator circuit. For each iteration, a pair of bit will be compared. But the others like ROM, half or full adder don’t need any type of iterations. Hence, Comparator is the right answer.

2. How many states are possible for any iterative comparator circuit?
a) 2
b) 3
c) 4
d) 5

Explanation: For any comparator circuit, between the two compared words, three results are possible. One can be greater than, equal to or less than the other. Thus 3 states are possible.

3. Which one of the following is the simplest form of an iterative circuits?
a) A linear array of combinational cells with signals between cells traveling in only one direction
b) A linear array of sequential cells with signals between cells traveling in only one direction
c) A linear array of combinational cells with signals between cells traveling in various direction
d) A linear array of sequential cells with signals between cells traveling in various direction

Explanation: Iterative circuits are linear arrays of combinational circuits where the signals between the cell flows only in one direction. Each combinational circuit has one or more primary inputs (xi) and possibly one or more primary outputs (zi).

4. How the primary inputs to the combinational cells in an iterative circuit is applied?
a) Serial transmission
b) Parallel transmission
c) Both serial and parallel
d) Parallel but not simultaneously

Explanation: The primary inputs to the cells are applied in parallel. That is, they are all applied at the same time. This reduces time consumption and makes the circuit work faster.

5. In which category, the iterative circuits can be classified?
a) Serial Input Serial Output device
b) Serial Input Parallel Output device
c) Parallel Input Serial Output device
d) Parallel Input Parallel Output device

Explanation: Iterative circuits are Parallel Input Parallel Output devices as the primary inputs to the cells are applied in parallel. As well, the output bits can also be read in a parallel manner. That’s why the option Parallel Input Parallel Output device is right.

Sanfoundry Global Education & Learning Series – Logic Design.

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