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101.

The flag bits in an ALU is defined as ___________(a) The total number of registers(b) The status bit conditions(c) The total number of control lines(d) All of the MentionedThis question was posed to me by my college professor while I was bunking the class.This interesting question is from Introduction of Arithmetic Operation in section Arithmetic Circuits of Digital Circuits

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Right option is (B) The status bit conditions

The best EXPLANATION: In an ALU, status bit conditions are sometimes called CONDITION code bits or FLAG bits. It is so called because they tend to REPRESENT the status of the respect flags after any operation.
Discussion
102.

All logic operations can be obtained by means of __________(a) AND and NAND operations(b) OR and NOR operations(c) OR and NOT operations(d) NAND and NOR operationsI got this question in an online interview.This interesting question is from Introduction of Arithmetic Operation in division Arithmetic Circuits of Digital Circuits

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Correct answer is (d) NAND and NOR operations

The explanation: Since the logic gates NORand NAND are known as universal logic gates, therefore it can be USED to design all the THREE BASIC gates AND, OR and NOT. Thus, it MEANS that any operations can be obtained by implementation of these gates.
Discussion
103.

If the two numbers include a sign bit in the highest order position, the bit conditions of interest are the sign of the result, a zero indication and __________(a) An underflow condition(b) A neutral condition(c) An overflow condition(d) One indicationI have been asked this question by my college director while I was bunking the class.Query is from Introduction of Arithmetic Operation in division Arithmetic Circuits of Digital Circuits

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Discussion
104.

If the two numbers are unsigned, the bit conditions of interest are the ______ carry and a possible _____ result.(a) Input, zero(b) Output, one(c) Input, one(d) Output, zeroI had been asked this question in an internship interview.I need to ask this question from Introduction of Arithmetic Operation in division Arithmetic Circuits of Digital Circuits

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The correct CHOICE is (d) Output, zero

Easiest explanation: If the TWO numbers are unsigned, the bit conditions of INTEREST are the output carry and a possible zero result.
Discussion
105.

The design of an ALU is based on __________(a) Sequential logic(b) Combinational logic(c) Multiplexing(d) De-MultiplexingI got this question in exam.The above asked question is from Introduction of Arithmetic Operation in portion Arithmetic Circuits of Digital Circuits

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The correct answer is (b) COMBINATIONAL LOGIC

The best explanation: The DESIGN of an ALU is based on combinational logic. Because the unit has a regular pattern, it can be broken into identical stages connected in cascade through carries.
Discussion
106.

The basic building blocks of the arithmetic unit in digital computers are __________(a) Subtractors(b) Adders(c) Multiplexer(d) ComparatorThis question was posed to me during an online exam.This question is from Introduction of Arithmetic Operation topic in portion Arithmetic Circuits of Digital Circuits

Answer» RIGHT option is (b) Adders

Explanation: The basic building blocks of the arithmetic unit in digital COMPUTERS are adders. Since a parallel adder is constructed with a NUMBER of full-adder circuits CONNECTED in cascade. By controlling the data inputs to the parallel adder, it is POSSIBLE to obtain different types of arithmetic operations.
Discussion
107.

A digital system consists of _____ types of circuits.(a) 2(b) 3(c) 4(d) 5This question was posed to me by my college director while I was bunking the class.Origin of the question is Introduction of Arithmetic Operation in division Arithmetic Circuits of Digital Circuits

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Discussion