Full Subtractor Question & AnswersNovember 22, 2021 By WatElectronics This article lists 100 Full Subtractor MCQs for engineering students. All the Full Subtractor Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up their fundamentals on Full Subtractor.A full subtractor is a combinational logic circuit. The main function of a full subtractor is to perform logical or Boolean subtraction operations using 2 half subtractors. It consists of 3 inputs A, B, Bin where Bin is Borrow in and 2 outputs D-difference and Bout – Borrow output. It is also available in form of IC technology such as 74LS283N Full subtractor IC with 16 pins. A full subtractor requires 7 logic gates to be implemented namely 2XOR, 2AND, 2NOT, and one OR gate. The Boolean equation obtained from the full subtractor is represented using K-map. The advantages of a full subtractor include cascades multiple half subtractors, uses a full adder & 2’s complement. But they limit in terms of absence of borrow bit, delay, and complex design. A full adder is employed in computers, microcontrollers, and processors. 1). A full subtractor is a _____ type of electronic circuit?CombinationalLogicalSequentialAll the aboveHintOne of the classification of electronic circuits Read more about the electronic circuits. 2). A full subtractor performs subtraction minimum of ___ number of inputs?2341HintMinimum number 3). A full subtractor is a combination of ____ component?Half addersHalf subtractorsFull addersHalf multiplexersHintcombination of 2 subtractor. 4). How many inputs do a full subtractors have?2345Hintabove minimum number 5). How many outputs do a full subtractors have?2345HintMinimum value 6). When the inputs A, B, Bin is (0,0,0) then the Difference output of full subtractor is________?01XAll the aboveHintproduct with 0 is always. 7). When the inputs A, B, Bin is (0,0,1) then the Difference output of full subtractor is________?01XAll the aboveHintaddition of 0's with 1. 8). When the inputs A, B, Bin is (0,1,0) then the Difference output of full subtractor is________?01XAll the aboveHintAddition of 0 and 1. 9). When the inputs A, B, Bin is (1,0,0) then the Difference output of full subtractor is________?01XAll the aboveHintAddition of 0 and 1. 10). When the inputs A, B, Bin is (0,1,1) then the Difference output of full subtractor is________?01XAll the aboveHintProduct of any term with 0 is 11). When the inputs A, B, Bin is (1,0,1) then the Difference output of full subtractor is________?01XAll the aboveHintProduct of any term with 0 is? 12). When the inputs A, B, Bin is (1,1,0) then the Difference output of full subtractor is________?01XAll the aboveHintProduct of any term with 0 is? 13). When the inputs A, B, Bin is (1,11) then the Difference output of full subtractor is________?01XAll the aboveHintaddition of 0's with 1. 14). When the inputs A, B, Bin is (0,0,0) then the Borrow output of full subtractor is________?01XAll the aboveHintaddition of 0's with 1. 15). When the inputs A, B, Bin is (0,0,1) then the Borrow output of full subtractor is________?01XAll the aboveHintAddition of 0's with 1 is? 16). When the inputs A, B, Bin is (0,1,0) then the Borrow output of full subtractor is________?01XAll the aboveHintAddition of 0's with 1. 17). When the inputs A, B, Bin is (0,1,1) then the Borrow output of full subtractor is________?01XAll the aboveHintaddition of 0's with 1. 18). When the inputs A, B, Bin is (1,0,0) then the Borrow output of full subtractor is________?01XAll the aboveHintproduct with 0 is always. 19). When the inputs A, B, Bin is (1,0,1) then the Borrow output of full subtractor is________?01XAll the aboveHintProduct of any term with 0 is? 20). When the inputs A, B, Bin is (1,1,0) then the Borrow output of full subtractor is________?01XAll the aboveHintProduct of any term with 0 is? 21). When the inputs A, B, Bin is (1,1,1) then the Borrow output of full subtractor is________?01XAll the aboveHintAddition of 0's with 1. 22). Which of the following is used to represent full subtractor logical circuits equation?K-mapQ-mapGraphAll the aboveHintMap that represents logic gates. 23). Identify the logical Difference ‘D’ equation obtained for 3bit full subtractor given in below figure?Truth TableA’B’Bin + AB’ B’in + ABBinA’Bin + A’B + BBinA’B’Bin + AB’ B’inA’B’Bin + ABBinHintConsidering all ones by pairing together and obtaining equation. 24). Identify the logical Borrow out ‘Bout’ equation obtained for 3bit full subtractor given in below figure?Add description hereTruth Table A’B’Bin + AB’ B’in + ABBinA’Bin + A’B + BBinA’B’Bin + AB’ B’inA’B’Bin + ABBinHintObtained by pairing two 1’s from K-map. 25). How many logic gates do a full subtractor requires?4567HintHas 2 basic logic gates and 1 combination of inverter and basic gate.Full Subtractor Questions and Answers for Exams 26). Which of the following gates do full subtractor Difference component requires to obtain output?XORANDNOTORHintProvides output as 1 if it has at least single input as 1. Read more about XOR gate. 27). Which of the following gates do full subtractor Borrow component requires to obtain output?XORANDNOTORAll the aboveHintHas 3 basic gates. 28). Which of the following is the first step to obtain Difference equation of full subtractor?Calculate XOR operation on inputs A and BCalculate XOR with BorrowRepresent the equationAll the aboveHintOnly single operation to be performed without carry or borrow. 29). Which of the following is the second step to obtain Difference equation of full subtractor?Calculate XOR operation on inputs A and BCalculate XOR with BorrowRepresent the equationAll the aboveHintPerform with the help of neighbor digit. 30). Which of the following is the third step to obtain Difference equation of full subtractor?Calculate XOR operation on inputs A and BCalculate XOR with BorrowRepresent the equationAll the aboveHintFinal step after calculating what should be done next? Read more about Full Subtractor. 31). Which of the following is the first step of Borrow equation of full subtractor?Do AND operation of 2 inputsDo XOR operation of 2inputsDo OR operation of 2 outputs of previous stepAll the aboveHintPerforms product operation. 32). Which of the following is the second step of Borrow equation of full subtractor?Do AND operation of 2 inputsDo XOR operation of 2inputsDo OR operation of 2 outputs of previous stepAll the aboveHintPerforms on 2 inputs. 33). Which of the following is the third step of Borrow equation of full subtractor?Do AND operation of 2 inputsDo XOR operation of 2inputsDo OR operation of 2 outputs of previous stepAll the aboveHintPerforms on 2 outputs. 34). The input to full subtractor is in ___ form?BinaryAnalogSignalBoth a and bHintForm of 0's and 1's. 35). Which of the following circuit is used in full subtractor?AdderSubtractorMultiplexerDecoderHintUnit that performs deduction process. 36). A logical subtractor is classified into ___ types?2345HintMinimum value. 37). Which of the following are the labels of full subtractor inputs?MinuendSubtrahendBorrowAll the aboveHint3 Components. 38. How many logic gates a full subtractors is implemented with?3456HintDouble the number of gates in 2 half adders. 39). Which of the following gate provide difference output of a full subtractor?ORXORANDNANDHintOutput value of the logic gate is 1 if odd number of 1's exists. 40). Which of the following gates provide Borrow out of a full subtractor?ORANDNOTAll the aboveHintBasic logic gates. 41). A minuend component of a full subtractor is also called ______?Inverted inputNoninverted inputCarry inputAll the aboveHintA positive terminal also called? 42). A Subtrahend component of a full subtractor is also called ______?Inverted inputNoninverted inputCarry inputAll the aboveHintNegative terminal also called? 43). The LSB of output obtained from a full subtractor is called ____ component?Inverted inputNoninverted inputCarry inputAll the aboveHintA component that takes output from the resultant and sends input to next component to perform subtraction. 44). Which of the following represent the value of signal of a full adder when the input logic is 1?HighLowInfiniteNone of the aboveHintMaximum value. 45). Which of the following represent the value of signal of a full adder when the input logic is 0?HighLowInfiniteNone of the aboveHintMinimum value. 46). Which of the following are the advantages of a subtractor?Simple in designPower saverHigh speedAll the aboveHintThe advantages of a subtractor includes simple in design, power saver and high speed. 47). Which of the following is the disadvantages of a subtractor?Does not require accept borrow input at initial stageDelay while processingHigh power dissipationAll the aboveHintAll the design parameters. 48). Which of the following are the applications of a full subtractor?ComputersMicrocontrollersProcessorsAll the aboveHintAll the electronic application. Read more about Microcontrollers. 49). Subtractors in computers perform ______operation?ArithmeticLogicGraphicalAll the aboveHintAll the ALU and graphical performance. 50). Which of the following includes athematic operation?AdditionSubtractionMultiplicationAll the aboveHintAll the mathematical operation.Full Subtractor Important Questions for Interviews 51). Which of the following operation do full subtractors processors do?Compute tablesAddressesPointsAll the aboveHintmaximum number of operations. 52). Which of the following operation do a full subtractor controllers do?Arithmetic subtractionTimersProgram counterAll the aboveHintMaximum number of 53). Which of the following is the 1 st step performed in full subtractor K-map?Choose K-map based on variables availabilityFind min terms and max termsPlace 1’s for SOPPlace 0’s for POSHintDraw map. 54). Which of the following is the 2 nd step performed in full subtractor K-map?Choose K-map based on variables availabilityFind min terms and max termsPlace 1’s for SOPPlace 0’s for POSHintFind terms. Read more about K-map. 55). Which of the following is the 3 rd step performed in full subtractor K-map?Choose K-map based on variables availabilityFind min terms and max termsPlace 1’s for SOPPlace 0’s for POSHintRepresent binary digit. 56). Which of the following is the 4 th step performed in full subtractor K-map?Choose K-map based on variables availabilityFind min terms and max termsPlace 1’s for SOPPlace 0’s for POSHintRepresent binary digit. 57). Which of the following is the 5 th step performed in full subtractor K-map?Place 1’s for SOPPlace 0’s for POSGroup terms with rectangle boxRepresent SOP and POS terms in form of equationHintPair equal digits. 58). Which of the following is the 5 th step performed in full subtractor K-map?Place 1’s for SOPPlace 0’s for POSGroup terms with rectangle boxRepresent SOP and POS terms in form of equationHintRepresent in equation 59). Which of the following is the advantage of a k-map?Simplifies Boolean equationsFewer stepsEasy methodAll the aboveHintPerforms mathematical tasks. 60). Which of the following are the disadvantages of a K-map?Complex processNon unique solution is obtainedDifficult methodBoth a and bHintDifficult to perform. 61. Which of the following method do K-map overcomes?Boolean algebra lawDeMorgans theoremGraphical representationBoth a and bHintMathematical representation 62). A K-map is also called as ____?2D tables3D tables4D tables5D tablesHintX and Y coordinates. 63). K-map is expressed to the power of n with a base____?12310HintBinary value. 64). While performing subtraction of 1 and 0 the term used is ______?BorrowCarryOutputInputHint0-1+? 65). A full subtractor has similar result that of _______?Half adderHalf subtractorFull adderFull multiplexerHintPerforms sum of 3 values. 66). Which of the following is the symbol for a full subtractor?+-*/HintSubtraction. 67). Which of the following operation do a logical gate performs?ArithmeticLogicalBooleanAll the aboveHintMathematical operations. 68). Which of the following digital components are used while implementing logic gates?TransistorsDiodesResistorsAll the aboveHintPassive components. 69). When the input signal for a full subtractor is logic 1 it represents the signal is _________?HighLowToggledBoth b and cHintMaximum value. 70). When the input signal for a full subtractor is logic 0 it represents the signal is _________?HighLowToggledBoth b and cHintMinimum value. 71). When the input signal for a full subtractor is fluctuating between logic 0 and 1 it represents the signal is__?HighLowToggledBoth b and cHintFluctuate value. 72). ___ is also know as time independent logic circuit?Digital logic circuitCombinational logic circuitSequential circuitBoth a and bHintElectronic circuit is also named as? Read more about the Combinational logic circuits. 73). A combination logic circuit performs ____ operation?ArithmeticBooleanLogicalAll the aboveHintAll the electronic circuits representation methods. 74). How many methods does a combinational circuit uses?1234HintBinary value also represented in number as? 75). A Boolean type circuit is a combinational ____ type of circuit?DigitalAnaloguePhysicsAll the aboveHintElectronic circuit also called?Full Subtractor Quiz Questions and Answers 76). In digital electronics Boolean type circuits are represented using _____?GatesResistorsWiresLoadHintComponent that acts like switch. 77). Which of the following are the examples of Boolean type circuits?ANDORNANDAll the aboveHintDigital gates. 78). Which of the following are the applications of Boolean type circuits?AddersSubtractorsMultiplexersAll the aboveHintMathematical calculating device. Read more about Multiplexers. 79). Which of the following are omitted by Boolean type circuit?MetastabilityPower consumptionGlitchesAll the aboveHintError quantities. 80). Which of the following parameters are measured using Boolean circuits?Circuit sizeAlterations madeDepth of circuitAll the aboveHintModifications and their impacts. 81). Logic gates are implemented using _____?TransistorsDiodesResistorsAll the aboveHintPassive components. Read more about Diodes. 82). Which of the following are the applications of logic circuits?RegistersMultiplexersCPU memoryAll the aboveHintComputer components. 83). A truth table of any digital gate is used to represent____?Boolean algebraBoolean functionPropositional calculusAll the aboveHintRelated to solving digital circuits. 84). How many parts a combinational logic circuits are classified?2345HintDual values. 85). Which of the following is the classification of code converter combinational logic type circuit?BCDPLD’sEncodersAddersHintElectronic data representation. 86). Which of the following is the classification of data transmission combinational logic type circuit?BCDPLD’sEncodersAddersHintComponent with single input and Multiple outputs. 87). Which of the following is the classification of ALU combinational logic type circuit?BCDDe-MUXMuxAddersHintPerforms addition. 88). How many components do a sequential type digital circuit contains?2345HintDual 89). The output of combinational logic circuit in a sequential type circuit is given to ____?Memory unitComparatorInput of combinational logic circuitAll the aboveHintComponent that stores data. 90). Which of the following are the advantages of a full subtractor?Cascades multiple half subtractorsEmploys 2’s complementUses full adderAll the aboveHintComponents that performs logical basic mathematical operation. 91). Which of the following components are required for implementing a full subtractor practically?74LS283NNOT gateAdderAll the aboveHintIC and logic gate. 92). A 74LS283N IC is a ___ TTL type chip?Full adderFull subtractorHalf adderHalf subtractorHintHas minuend as component. 93). How many pins do 74LS283N Full subtractor IC has?581632Hint8+8=? 94). Which of the following pin of 74LS283N Full subtractor IC is VCC?Pin 2Pin 4Pin 14Pin 16HintLast pin. 95). Which of the following pin of 74LS283N Full subtractor IC is GND?Pin 2Pin 4Pin 8Pin 16Hint4+4=? 96). Which of the following pin of 74LS04 of NOT gate IC is GND?Pin 2Pin 4Pin 8Pin 7HintPin before GND pin of IC. 97). Which of the following pin of 74LS04 of NOT gate IC is VCC?Pin 2Pin 14Pin 8Pin 7Hint7+7=? 98). How many pins do 74LS04 of NOT gate IC has?45814Hint7+7=? 99). Which of the following is the disadvantage of full subtractor?Absence of borrow bitComplex designDelayAll the aboveHintComplicated task. 100). Which of the following is the formula for 2’s complement?2^n3^m10^nAll the aboveHintBinary value also called? Time is Up! Time's up