Half Subtractor Question & Answers November 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 Hint 2). A subtractor performs logical subtraction using ____ symbol? - + / * Hint 3). Which of the following are the components used while performing logical subtraction? Opcodes Operands Constants Both a and b Hint 4). From the example a+b=c; identify opcodes? a,b b,c a,b,c +, = Hint 5). From the example a+b=c; identify operand? a,b b,c a, = + Hint 6). A logical gate performs ____ type of operations? Boolean Arithmetic Digital Both a and c Hint 7). A logic gate is implemented using ____? Diodes Transistors Resistors All the above Hint 8). How many outputs do a half subtractors obtains on logical operation? 1 2 3 4 Hint 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 Hint 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 Hint 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 Hint 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 Hint 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 Hint 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 Hint 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 Hint 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 Hint 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 Hint 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 Hint 19). Which of the following is the operation performed during half subtractors difference equation calculation? Addition XOR AND All the above Hint 20). Which of the following is the operation performed during half subtractors borrow equation calculation? Addition XOR AND All the above Hint 21). K-map is also called as_____? Karnaugh map KM-map KC-Map Both a and b Hint Read more about K-map. 22). _____ number of bits are used to perform logical half subtraction using a half subtractor? 1 2 3 4 Hint 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 Hint 24). A minunend of a half subtractors is a _____? Borrow Output Input Carry Hint 25). The output obtained by a full subtractor is similar to _________? Full adder Full multiplier Half adder Half multiplier Hint Half Subtractor Interview Questions and Answers Read more about Adders. 26). A binary subtractor is generally implemented using ______ Adders Multiplexers Decoders Encoders Hint 27). Which of the following logical subtractor equation defines B(bar)+1? –B B- +B B+ Hint 28). Which of the following logical subtractor equation defines A –B? A + (+B) A – (-B) A + (-B) All the above Hint 29). Which of the following is the output for logic AND gate when input provided is (1,1)? 0 1 X All the above Hint 30). How many logical gates are used in a half subtractor? 2 3 4 5 Hint 31). Which of the following are the applications of a half subtractor? CPU Micro controllers Adders All the above Hint 32). Which of the following are the advantages of a half subtractor? Simple in design Requires few logic gates Low cost All the above Hint 33). Which of the following are the disadvantages of a half subtractors? Limited to 2 bits Less scope Slow All the above Hint 34). K-map was introduced in the year________ 1953 1954 1955 1950 Hint 35). A K-map is a ___ diagram? Logical Scientific Mathematical All the above Hint 36). Which of the following electronic component performs “A-B”? Adder Subtractor Multiplexer All the above Hint 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 Hint 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 Hint 39). A Half subtractor is used in ____ type of electronic circuits? Digital Analog Electronic Both a and c Hint 40). If 2 inputs are provided to half subtractor, how many outputs are obtained? 2 3 4 5 Hint 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’) Hint 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 Hint 43). Which of the following component of logical half subtractor contains 2 gates? Difference Sum Carry Borrow Hint 44). The combination of AND and NOT logical gate in a logical half forms which of the following logic gate? AND OR XOR NAND Hint 45). What is the output of AND gate when 2 inputs are 0’s? 0 1 X All the above Hint 46). What is the output of AND gate when 2 inputs are 1’s? 0 1 X All the above Hint 47). What is the output of AND gate when 2 inputs are 0,1? 0 1 X All the above Hint 48). What is the output of AND gate when 2 inputs are 1, 0’s? 0 1 X All the above Hint 49). Logic 0 of an logic gate represents signal is _______? High Low Toggle None of the above Hint 50). Logic 1 of an logic gate represents signal is _______? High Low Toggle None of the above Hint Half Subtractor Important Questions for Interviews 51). An XOR gate works similar to ___ type of logic gate? OR AND NOR All the above Hint 52). When two inputs of an XOR gate is logic - 0,1 then its output is _____? 0 1 X All the above Hint 53). When two inputs of an XOR gate is logic – 1,0 then its output is _____? 0 1 X All the above Hint 54). When two inputs of an XOR gate is logic - 0,0 then its output is _____? 0 1 X All the above Hint 55). When two inputs of an XOR gate is logic - 1,1 then its output is _____? 0 1 X All the above Hint 56). When an input “logic0” is given to NOT gate then the output obtained is _____? 0 1 X All the above Hint 57). How many NOR gates are required while designing a half subtractor? 1 2 3 5 Hint 58). In how many steps a half subtraction design can be performed? 1 2 3 4 Hint 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 Hint 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 Hint 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 Hint 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 Hint 63). A K-map has ___ number of forms? 2 3 4 5 Hint Read more about Sum of Product. 64). How steps are required while performing K-map? 2 3 4 6 Hint 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 Hint 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 Hint 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 Hint 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 Hint 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 Hint 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 Hint 71). Identify the expression for exclusive NOR operation? X + Y’ X - Y’ X * Y’ X’ Φ Y’ Hint 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 Hint 73). Find the minimal term of following K-map? Half Subtractor bd b’d+dc b’d’ + b’c’ abc +d’ Hint 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’ Hint 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 Hint Half Subtractor Quiz Questions and Answers 76). A full subtractors has ____ number of half subtractors? 2 3 4 All the above Hint 77). Which of the following are the components of code converters? XOR gate OR gate AND gate AND-OR gate Hint 78). Which of the following is the representation of NOR gate? AND OR XOR NAND Hint 79). Which of the following requires 2 bits in a half subtractor? Inputs Outputs Both a and b None of the above Hint 80). Which of the following circuits implement combination of memory and logic gates? Sequential circuits Logical circuits Combinational circuits All the above Hint 81). Which of the following is the component of a practical design circuits? Gates Circuits Constraints Protocols Hint 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 Hint 84). Which of the following gate acts as dual of NAND? AND OR NOR NAND Hint 85). Which of the following is the primary universal gate? OR AND NAND NOR Hint 86). Which of the following is the secondary universal gate? OR AND NAND NOR Hint 87). Which of the following is most basic arithmetic operation? Addition Subtraction Multiplication Division Hint 88). An half subtractor is a building block of performing ____ operation of 2 binary numbers? Addition Subtraction Multiplication All the above Hint 89). Which of the following is added to XOR gate of half subtractor when it doesnot generate carry bit? OR AND NOR NAND Hint 90). A NOT gate used in half subtractor is also called as_______? Inverter Switch Diode All the above Hint 91). Which of the following represent Boolean logic function? Logic gates Passive components Active components All the above Hint Read more about Boolean function 92). A combinational type logic circuit is also called as _____? Time independent logic circuit Time dependent logic circuit Frequency dependent circuit All the above Hint 93). A combinational type logic circuit is designed using _______ methods? 2 3 4 5 Hint 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 Hint 95). Which of the following parameter of logic gate is represented using boolean algebra? Input Output Intermediate values All the above Hint 96). _____ is called the graphical representation of a combinational type logic gates? Logical diagram Timing diagram Block diagram All the above Hint 97). Combinational circuits are classified in to ____ types? 2 3 4 5 Hint 98). Which of the following are the examples of ALU logic circuit? Comparators PLD’s Subtractors All the above Hint 99). Which of the following are the examples of data transmission type combinational logic circuit? Decoders Encoders Demultiplexers All the above Hint 100). Which of the following are the examples of combinational type logic circuits? BCD Binary Decimal All the above Hint Time is Up! Time's up