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? Sequential Logical Combinational All the above HintExample 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? Opcodes Operands Constants Both a and b Hinta+b where a, b is? and + is ?4). From the example a+b=c; identify opcodes? a,b b,c a,b,c +, = HintAlphabets.5). From the example a+b=c; identify operand? a,b b,c a, = + HintAddition symbol.6). A logical gate performs ____ type of operations? Boolean Arithmetic Digital Both a and c HintBinary digit representation.7). A logic gate is implemented using ____? Diodes Transistors Resistors All the above HintPassive components.8). How many outputs do a half subtractors obtains on logical operation? 1 2 3 4 HintBinary number also called?9). At which condition do Bout (borrow output) is set to “1”, when X and Y are 2 inputs? X<Y X>Y X=Y X=0 HintGreater 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 `. Y Bout = X * Y Bout = X/Y All the above HintProduct of?11). What is the value of “D” difference when inputs a,b is provided with logic values “0,0”? 0 1 X All the above HintMinimum value.12). What is the value of “D” difference when inputs a,b is provided with logic values “0,1”? 0 1 X All the above HintMaximum value.13). What is the value of “D” difference when inputs a,b is provided with logic values “1,0”? 0 1 X All the above HintMaximum value.14. What is the value of “D” difference when inputs a,b is provided with logic values “1,1”? 0 1 X All the above HintMinimum value.15). What is the value of “Bout” borrow output when inputs a,b is provided with logic values “1,1”? 0 1 X All the above HintMinimum value.16). What is the value of “Bout” borrow output when inputs a,b is provided with logic values “0,1”? 0 1 X All the above HintMaximum value.17). What is the value of “Bout” borrow output when inputs a,b is provided with logic values “1,0”? 0 1 X All the above HintMinimum value.18). What is the value of “Bout” borrow output when inputs a,b is provided with logic values “0,0”? 0 1 X All the above HintMaximum value.19). Which of the following is the operation performed during half subtractors difference equation calculation? Addition XOR AND All the above HintOutput 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? Addition XOR AND All the above HintLogic gates that performs multiplication.21). K-map is also called as_____? Karnaugh map KM-map KC-Map Both a and b HintMap that represents logic gates. Read more about K-map. 22). _____ number of bits are used to perform logical half subtraction using a half subtractor? 1 2 3 4 HintBinary number also called.23). Which of the following term defines when a binary digit ‘0’ takes another binary digit ‘1’ to perform logical subtraction? Input Output Sum Borrow Hint0-1=?24). A minunend of a half subtractors is a _____? Borrow Output Input Carry HintSupply is give at which end?25). The output obtained by a full subtractor is similar to _________? Full adder Full multiplier Half adder Half multiplier Hint3 bit input.Half Subtractor Interview Questions and Answers Read more about Adders.26). A binary subtractor is generally implemented using ______ Adders Multiplexers Decoders Encoders Hintwhich operation is performed in a+b?27). Which of the following logical subtractor equation defines B(bar)+1? –B B- +B B+ HintSubtraction sign.28). Which of the following logical subtractor equation defines A –B? A + (+B) A – (-B) A + (-B) All the above HintTwo operators are used.29). Which of the following is the output for logic AND gate when input provided is (1,1)? 0 1 X All the above HintToggle value of 1?30). How many logical gates are used in a half subtractor? 2 3 4 5 HintOdd number.31). Which of the following are the applications of a half subtractor? CPU Micro controllers Adders All the above HintMathematical operator unit and computer's unit.32). Which of the following are the advantages of a half subtractor? Simple in design Requires few logic gates Low cost All the above HintFactors depending on circuit components and design.33). Which of the following are the disadvantages of a half subtractors? Limited to 2 bits Less scope Slow All the above HintMinimum bits.34). K-map was introduced in the year________ 1953 1954 1955 1950 HintOdd year.35). A K-map is a ___ diagram? Logical Scientific Mathematical All the above HintMap that represents logic gates.36). Which of the following electronic component performs “A-B”? Adder Subtractor Multiplexer All the above HintMinus operation.37). Which of the following represents half subtractors equation if X and Y are 2 inputs; Z as output? Z=X+Y Z=XY’ Z=X’Y Z= ‘XY HintProduct 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? LSB MSB Carry Bit Difference bit HintSubtraction.39). A Half subtractor is used in ____ type of electronic circuits? Digital Analog Electronic Both a and c Hint0's and 1's representation.40). If 2 inputs are provided to half subtractor, how many outputs are obtained? 2 3 4 5 HintQuard 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’Y B=X’-Y B= Y’+X All the above HintProduct.43). Which of the following component of logical half subtractor contains 2 gates? Difference Sum Carry Borrow HintMinus operation.44). The combination of AND and NOT logical gate in a logical half forms which of the following logic gate? AND OR XOR NAND HintUniversal logic gate.45). What is the output of AND gate when 2 inputs are 0’s? 0 1 X All the above HintLeast value.46). What is the output of AND gate when 2 inputs are 1’s? 0 1 X All the above HintA gates logic when high is represented using?47). What is the output of AND gate when 2 inputs are 0,1? 0 1 X All the above HintLeast value.48). What is the output of AND gate when 2 inputs are 1, 0’s? 0 1 X All the above HintLeast value.49). Logic 0 of an logic gate represents signal is _______? High Low Toggle None of the above HintMinimum value.50). Logic 1 of an logic gate represents signal is _______? High Low Toggle None of the above HintMaximum value.Half Subtractor Important Questions for Interviews51). An XOR gate works similar to ___ type of logic gate? OR AND NOR All the above Hinta+b52). When two inputs of an XOR gate is logic - 0,1 then its output is _____? 0 1 X All the above HintMaximum value.53). When two inputs of an XOR gate is logic – 1,0 then its output is _____? 0 1 X All the above HintMaximum value.54). When two inputs of an XOR gate is logic - 0,0 then its output is _____? 0 1 X All the above HintLeast value.55). When two inputs of an XOR gate is logic - 1,1 then its output is _____? 0 1 X All the above HintMaximum value.56). When an input “logic0” is given to NOT gate then the output obtained is _____? 0 1 X All the above HintMaximum value.57). How many NOR gates are required while designing a half subtractor? 1 2 3 5 HintOdd number.58). In how many steps a half subtraction design can be performed? 1 2 3 4 HintEven value.59). Which of the following is the 1 st step of half subtraction design operation? Consider binary inputs Represent K-map Derive equation Express in terms of logic gate HintPerforms on input values.60). Which of the following is the 2 nd step of half subtraction design operation? Consider binary inputs Represent K-map Derive equation Express in terms of logic gate HintRepresent in table.61). Which of the following is the 3 rd step of half subtraction design operation? Consider binary inputs Represent K-map Derive equation Express in terms of logic gate HintRepresent mathematically.62). Which of the following is the 4 th step of half subtraction design operation? Consider binary inputs Represent K-map Derive equation Express in terms of logic gate HintDraw the representation63). A K-map has ___ number of forms? 2 3 4 5 HintMinimum value. Read more about Sum of Product.64). How steps are required while performing K-map? 2 3 4 6 HintMaximum value.65). Which of the following is the 1 st step of K-map? Choosing K-map based on variables available Find Min and max terms Place 1’s for SOP Place 0’s for POS HintSelecting rows and columns.66). Which of the following is the 2 nd step of K-map? Choosing K-map based on variables available Find Min and max terms Place 1’s for SOP Place 0’s for POS HintFinding terms.67). Which of the following is the 3 rd step of K-map? Choosing K-map based on variables available Find Min and max terms Place 1’s for SOP Place 0’s for POS HintPerform arithmetic based operation.68). Which of the following is the 4 th step of K-map? Choosing K-map based on variables available Find Min and max terms Place 1’s for SOP Place 0’s for POS HintPerform arithmetic based operation.69). Which of the following is the 5 th step of K-map? Place 1’s for SOP Place 0’s for POS Select boxes by drawing rectangular terms with power of 2, 4, 8… Calculate sum and product terms for SOP HintPairing process.70). Which of the following is the 6 th step of K-map? Place 1’s for SOP Place 0’s for POS Select boxes by drawing rectangular terms with power of 2, 4, 8… Calculate sum and product terms for SOP HintPerform 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 Subtractor X X+Y X xor Y Y HintOne parameter.73). Find the minimal term of following K-map?Half Subtractor bd b’d+dc b’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+Q PQ+R P + Q’*R’ HintSOP representation.75). If A,B are the inputs of a subtractor, and if A=B; what is output value?Logic Gate Diagram A B 1 0 HintMinimum value.Half Subtractor Quiz Questions and Answers76). A full subtractors has ____ number of half subtractors? 2 3 4 All the above HintMany values.77). Which of the following are the components of code converters? XOR gate OR gate AND gate AND-OR gate Hint2 Logic gates.78). Which of the following is the representation of NOR gate? AND OR XOR NAND HintGate that performs logic inverted OR operation.79). Which of the following requires 2 bits in a half subtractor? Inputs Outputs Both a and b None of the above Hint2 values.80). Which of the following circuits implement combination of memory and logic gates? Sequential circuits Logical circuits Combinational circuits All the above HintClassification of logic gates.81). Which of the following is the component of a practical design circuits? Gates Circuits Constraints Protocols HintPhysical parameter.82). Half type subtractors defines 1 as output when_____ is performed? Complemented Sum Carried Borrowed 83). 2 bit type subtraction is performed using______? Half adder Half subtractor Half multiplexer All the above HintBinary value is also called?84). Which of the following gate acts as dual of NAND? AND OR NOR NAND HintGate that performs product of terms with an inverted output.85). Which of the following is the primary universal gate? OR AND NAND NOR HintGate that performs product of terms with an inverted output.86). Which of the following is the secondary universal gate? OR AND NAND NOR HintGate that performs sum of terms with an inverted output.87). Which of the following is most basic arithmetic operation? Addition Subtraction Multiplication Division HintPerforms addition.88). An half subtractor is a building block of performing ____ operation of 2 binary numbers? Addition Subtraction Multiplication All the above HintDigital value representation.89). Which of the following is added to XOR gate of half subtractor when it doesnot generate carry bit? OR AND NOR NAND HintGate that performs product of terms/90). A NOT gate used in half subtractor is also called as_______? Inverter Switch Diode All the above HintPerforms opposite of input.91). Which of the following represent Boolean logic function? Logic gates Passive components Active components All the above HintClassification of OR, XOR and NAND. Read more about Boolean function92). A combinational type logic circuit is also called as _____? Time independent logic circuit Time dependent logic circuit Frequency dependent circuit All the above HintWhat is the inverse of frequency.93). A combinational type logic circuit is designed using _______ methods? 2 3 4 5 HintPerforms both sum and product operation Read more about combinational circuits.94). Which of the following are the functions of combinational type logic circuit? Logic diagram Truth table Boolean Algebra All the above HintMaximum operation.95). Which of the following parameter of logic gate is represented using boolean algebra? Input Output Intermediate values All the above HintRaw data.96). _____ is called the graphical representation of a combinational type logic gates? Logical diagram Timing diagram Block diagram All the above HintOR, XOR representation.97). Combinational circuits are classified in to ____ types? 2 3 4 5 HintOdd number.98). Which of the following are the examples of ALU logic circuit? Comparators PLD’s Subtractors All the above HintPreforms ALU operations.99). Which of the following are the examples of data transmission type combinational logic circuit? Decoders Encoders Demultiplexers All the above HintPerforms mathematical tasks.100). Which of the following are the examples of combinational type logic circuits? BCD Binary Decimal All the above HintPerforms digital operations. Time is Up! Time's up