Half Subtractor Question & AnswersNovember 22, 2021 By WatElectronics This article lists 100 Half Subtractor MCQs for engineering students. All the Half 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 Half Subtractor.A subtractor is an electronic component of combinational logic circuit that performs logical subtraction of 2 binary bits and provides output results in the form of borrow and carries bits. Generally, electronic circuits are digitally represented using logic gates in various forms among which logic gates are used to represent Adders like a half adder, full adder, Subtractors, Multiplexers, and more. Subtractors are further divided into half and full subtractors. Where a half subtractor performs subtraction of only 2 binary bits with borrow and carries bit as output. It is represented using 3 logic gates NAND, XOR, and NOT. The advantage of a half subtractor is it is simple in design, requires few logic gates, and low cost. These are deployed in devices such as clocks, digital timers, CPUs, and microcontrollers. 1). A half subtractor is an _____ type of electronic circuit?SequentialLogicalCombinationalAll the aboveHintExample includes Subtractor and Adders. 2). A subtractor performs logical subtraction using ____ symbol?-+/*Hinta-b defines which operation? 3). Which of the following are the components used while performing logical subtraction?OpcodesOperandsConstantsBoth a and bHinta+b where a, b is? and + is ? 4). From the example a+b=c; identify opcodes?a,bb,ca,b,c+, =HintAlphabets. 5). From the example a+b=c; identify operand?a,bb,ca, =+HintAddition symbol. 6). A logical gate performs ____ type of operations?BooleanArithmeticDigitalBoth a and cHintBinary digit representation. 7). A logic gate is implemented using ____?DiodesTransistorsResistorsAll the aboveHintPassive components. 8). How many outputs do a half subtractors obtains on logical operation?1234HintBinary number also called? 9). At which condition do Bout (borrow output) is set to “1”, when X and Y are 2 inputs?XX>YX=YX=0HintGreater symbol. 10). Which of the following is the logical formula for half subtractor, when X and Y are inputs and Bout is obtained output?Bout =X `. YBout = X * YBout = X/YAll the aboveHintProduct of? 11). What is the value of “D” difference when inputs a,b is provided with logic values “0,0”?01XAll the aboveHintMinimum value. 12). What is the value of “D” difference when inputs a,b is provided with logic values “0,1”?01XAll the aboveHintMaximum value. 13). What is the value of “D” difference when inputs a,b is provided with logic values “1,0”?01XAll the aboveHintMaximum value. 14. What is the value of “D” difference when inputs a,b is provided with logic values “1,1”?01XAll the aboveHintMinimum value. 15). What is the value of “Bout” borrow output when inputs a,b is provided with logic values “1,1”?01XAll the aboveHintMinimum value. 16). What is the value of “Bout” borrow output when inputs a,b is provided with logic values “0,1”?01XAll the aboveHintMaximum value. 17). What is the value of “Bout” borrow output when inputs a,b is provided with logic values “1,0”?01XAll the aboveHintMinimum value. 18). What is the value of “Bout” borrow output when inputs a,b is provided with logic values “0,0”?01XAll the aboveHintMaximum value. 19). Which of the following is the operation performed during half subtractors difference equation calculation?AdditionXORANDAll the aboveHintOutput value of the logic gate is 1 if odd number of 1's exists. 20). Which of the following is the operation performed during half subtractors borrow equation calculation?AdditionXORANDAll the aboveHintLogic gates that performs multiplication. 21). K-map is also called as_____?Karnaugh mapKM-mapKC-MapBoth a and bHintMap that represents logic gates. Read more about K-map. 22). _____ number of bits are used to perform logical half subtraction using a half subtractor?1234HintBinary number also called. 23). Which of the following term defines when a binary digit ‘0’ takes another binary digit ‘1’ to perform logical subtraction?InputOutputSumBorrowHint0-1=? 24). A minunend of a half subtractors is a _____?BorrowOutputInputCarryHintSupply is give at which end? 25). The output obtained by a full subtractor is similar to _________?Full adderFull multiplierHalf adderHalf multiplierHint3 bit input.Half Subtractor Interview Questions and Answers Read more about Adders. 26). A binary subtractor is generally implemented using ______AddersMultiplexersDecodersEncodersHintwhich operation is performed in a+b? 27). Which of the following logical subtractor equation defines B(bar)+1?–BB-+BB+HintSubtraction sign. 28). Which of the following logical subtractor equation defines A –B?A + (+B)A – (-B)A + (-B)All the aboveHintTwo operators are used. 29). Which of the following logical subtractor equation defines A –B?A+B(bar) +1B+A(bar)-1B+A-1All the aboveHintSingle operator is used. 30). How many logical gates are used in a half subtractor?2345HintOdd number. 31). Which of the following are the applications of a half subtractor?CPUMicro controllersAddersAll the aboveHintMathematical operator unit and computer's unit. 32). Which of the following are the advantages of a half subtractor?Simple in designRequires few logic gatesLow costAll the aboveHintFactors depending on circuit components and design. 33). Which of the following are the disadvantages of a half subtractors?Limited to 2 bitsLess scopeSlowAll the aboveHintMinimum bits. 34). K-map was introduced in the year________1953195419551950HintOdd year. 35). A K-map is a ___ diagram?LogicalScientificMathematicalAll the aboveHintMap that represents logic gates. 36). Which of the following electronic component performs “A-B”?AdderSubtractorMultiplexerAll the aboveHintMinus operation. 37). Which of the following represents half subtractors equation if X and Y are 2 inputs; Z as output?Z=X+YZ=XY’Z=X’YZ= ‘XYHintProduct and complement of a term. 38). ____ is labeled as result of 2 bit logical subtraction?38. ____ is labeled as result of 2 bit logical subtraction?LSBMSBCarry BitDifference bitHintSubtraction. 39). A Half subtractor is used in ____ type of electronic circuits?DigitalAnalogElectronicBoth a and cHint0's and 1's representation. 40). If 2 inputs are provided to half subtractor, how many outputs it provides?2345HintQuard mean? 41). Which of the following is the equation of half subtractors difference equation, when X, Y are inputs and D is difference?D= (X’Y +XY’)D= (X’Y - XY’)D= (X’Y +X’Y’)D= (X’Y – X’Y’)HintSum. 42). Which of the following is the equation of half subtractors Borrow equation, when X, Y are inputs and B is Borrow?B= X’YB=X’-YB= Y’+XAll the aboveHintProduct. 43). Which of the following component of logical half subtractor contains 2 gates?DifferenceSumCarryBorrowHintMinus operation. 44). The combination of AND and NOT logical gate in a logical half forms which of the following logic gate?ANDORXORNANDHintUniversal logic gate. 45). What is the output of AND gate when 2 inputs are 0’s?01XAll the aboveHintLeast value. 46). What is the output of AND gate when 2 inputs are 1’s?01XAll the aboveHintA gates logic when high is represented using? 47). What is the output of AND gate when 2 inputs are 0,1?01XAll the aboveHintLeast value. 48). What is the output of AND gate when 2 inputs are 1, 0’s?01XAll the aboveHintLeast value. 49). Logic 0 of an logic gate represents signal is _______?HighLowToggleNone of the aboveHintMinimum value. 50). Logic 1 of an logic gate represents signal is _______?HighLowToggleNone of the aboveHintMaximum value.Half Subtractor Important Questions for Interviews 51). An XOR gate works similar to ___ type of logic gate?ORANDNORAll the aboveHinta+b 52). When two inputs of an XOR gate is logic - 0,1 then its output is _____?01XAll the aboveHintMaximum value. 53). When two inputs of an XOR gate is logic – 1,0 then its output is _____?01XAll the aboveHintMaximum value. 54). When two inputs of an XOR gate is logic - 0,0 then its output is _____?01XAll the aboveHintLeast value. 55). When two inputs of an XOR gate is logic - 1,1 then its output is _____?01XAll the aboveHintMaximum value. 56). When an input “logic0” is given to NOT gate then the output obtained is _____?01XAll the aboveHintMaximum value. 57). How many NOR gates are required while designing a half subtractor?1235HintOdd number. 58). In how many steps a half subtraction design can be performed?58. In how many steps a half subtraction design can be performed?1234HintEven value. 59). Which of the following is the 1 st step of half subtraction design operation?Consider binary inputsRepresent K-mapDerive equationExpress in terms of logic gateHintPerforms on input values. 60). Which of the following is the 2 nd step of half subtraction design operation?Consider binary inputsRepresent K-mapDerive equationExpress in terms of logic gateHintRepresent in table. 61). Which of the following is the 3 rd step of half subtraction design operation?Consider binary inputsRepresent K-mapDerive equationExpress in terms of logic gateHintRepresent mathematically. 62). Which of the following is the 4 th step of half subtraction design operation?Consider binary inputsRepresent K-mapDerive equationExpress in terms of logic gateHintDraw the representation 63). A K-map has ___ number of forms?2345HintMinimum value. Read more about Sum of Product. 64). How steps are required while performing K-map?2346HintMaximum value. 65). Which of the following is the 1 st step of K-map?Choosing K-map based on variables availableFind Min and max termsPlace 1’s for SOPPlace 0’s for POSHintSelecting rows and columns. 66). Which of the following is the 2 nd step of K-map?Choosing K-map based on variables availableFind Min and max termsPlace 1’s for SOPPlace 0’s for POSHintFinding terms. 67). Which of the following is the 3 rd step of K-map?Choosing K-map based on variables availableFind Min and max termsPlace 1’s for SOPPlace 0’s for POSHintPerform arithmetic based operation. 68). Which of the following is the 4 th step of K-map?Choosing K-map based on variables availableFind Min and max termsPlace 1’s for SOPPlace 0’s for POSHintPerform arithmetic based operation. 69). Which of the following is the 5 th step of K-map?Place 1’s for SOPPlace 0’s for POSSelect boxes by drawing rectangular terms with power of 2, 4, 8…Calculate sum and product terms for SOPHintPairing process. 70). Which of the following is the 6 th step of K-map?Place 1’s for SOPPlace 0’s for POSSelect boxes by drawing rectangular terms with power of 2, 4, 8…Calculate sum and product terms for SOPHintPerform mathematical tasks. 71). Identify the expression for exclusive NOR operation?X + Y’X - Y’X * Y’X’ Φ Y’HintLogic gate operator symbol. 72). Identify the boolen equation when X, Y are inputs ad f(X,Y) is output from the below image?Half SubtractorXX+YX xor YYHintOne parameter. 73). Find the minimal term of following K-map?Half Subtractor bdb’d+dcb’d’ + b’c’abc +d’HintSum of product. 74). Find the solution for the following Boolean equation "(P+Q’+R’) * (P+Q’+R) * (P+Q+R’)?P’ *Q +R’PR+QPQ+RP + Q’*R’HintSOP representation. 75). If A,B are the inputs of a subtractor, and if A=B; what is output value?Logic Gate DiagramAB10HintMinimum value.Half Subtractor Quiz Questions and Answers 76). A full subtractors has ____ number of half subtractors?234All the aboveHintMany values. 77). Which of the following are the components of code converters?XOR gateOR gateAND gateAND-OR gateHint2 Logic gates. 78). Which of the following is the representation of NOR gate?ANDORXORNANDHintGate that performs logic inverted OR operation. 79). Which of the following requires 2 bits in a half subtractor?InputsOutputsBoth a and bNone of the aboveHint2 values. 80). Which of the following circuits implement combination of memory and logic gates?Sequential circuitsLogical circuitsCombinational circuitsAll the aboveHintClassification of logic gates. 81). Which of the following is the component of a practical design circuits?GatesCircuitsConstraintsProtocolsHintPhysical parameter. 82). Half type subtractors defines 1 as output when_____ is performed?ComplementedSumCarriedBorrowed 83). 2 bit type subtraction is performed using______?Half adderHalf subtractorHalf multiplexerAll the aboveHintBinary value is also called? 84). Which of the following gate acts as dual of NAND?ANDORNORNANDHintGate that performs product of terms with an inverted output. 85). Which of the following is the primary universal gate?ORANDNANDNORHintGate that performs product of terms with an inverted output. 86). Which of the following is the secondary universal gate?ORANDNANDNORHintGate that performs sum of terms with an inverted output. 87). Which of the following is most basic arithmetic operation?AdditionSubtractionMultiplicationDivisionHintPerforms addition. 88). An half subtractor is a building block of performing ____ operation of 2 binary numbers?AdditionSubtractionMultiplicationAll the aboveHintDigital value representation. 89). Which of the following is added to XOR gate of half subtractor when it doesnot generate carry bit?ORANDNORNANDHintGate that performs product of terms/ 90). A NOT gate used in half subtractor is also called as_______?InverterSwitchDiodeAll the aboveHintPerforms opposite of input. 91). Which of the following represent Boolean logic function?Logic gatesPassive componentsActive componentsAll the aboveHintClassification of OR, XOR and NAND. Read more about Boolean function 92). A combinational type logic circuit is also called as _____?Time independent logic circuitTime dependent logic circuitFrequency dependent circuitAll the aboveHintWhat is the inverse of frequency. 93). A combinational type logic circuit is designed using _______ methods?2345HintPerforms both sum and product operation Read more about combinational circuits. 94). Which of the following are the functions of combinational type logic circuit?Logic diagramTruth tableBoolean AlgebraAll the aboveHintMaximum operation. 95). Which of the following parameter of logic gate is represented using boolean algebra?InputOutputIntermediate valuesAll the aboveHintRaw data. 96). _____ is called the graphical representation of a combinational type logic gates?Logical diagramTiming diagramBlock diagramAll the aboveHintOR, XOR representation. 97). Combinational circuits are classified in to ____ types?2345HintOdd number. 98). Which of the following are the examples of ALU logic circuit?ComparatorsPLD’sSubtractorsAll the aboveHintPreforms ALU operations. 99). Which of the following are the examples of data transmission type combinational logic circuit?DecodersEncodersDemultiplexersAll the aboveHintPerforms mathematical tasks. 100). Which of the following are the examples of combinational type logic circuits?BCDBinaryDecimalAll the aboveHintPerforms digital operations. Time is Up! Time's up