Full Subtractor Question & Answers November 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? Combinational Logical Sequential All the above Hint Read more about the electronic circuits. 2). A full subtractor performs subtraction minimum of ___ number of inputs? 2 3 4 1 Hint 3). A full subtractor is a combination of ____ component? Half adders Half subtractors Full adders Half multiplexers Hint 4). How many inputs do a full subtractors have? 2 3 4 5 Hint 5). How many outputs do a full subtractors have? 2 3 4 5 Hint 6). When the inputs A, B, Bin is (0,0,0) then the Difference output of full subtractor is________? 0 1 X All the above Hint 7). When the inputs A, B, Bin is (0,0,1) then the Difference output of full subtractor is________? 0 1 X All the above Hint 8). When the inputs A, B, Bin is (0,1,0) then the Difference output of full subtractor is________? 0 1 X All the above Hint 9). When the inputs A, B, Bin is (1,0,0) then the Difference output of full subtractor is________? 0 1 X All the above Hint 10). When the inputs A, B, Bin is (0,1,1) then the Difference output of full subtractor is________? 0 1 X All the above Hint 11). When the inputs A, B, Bin is (1,0,1) then the Difference output of full subtractor is________? 0 1 X All the above Hint 12). When the inputs A, B, Bin is (1,1,0) then the Difference output of full subtractor is________? 0 1 X All the above Hint 13). When the inputs A, B, Bin is (1,11) then the Difference output of full subtractor is________? 0 1 X All the above Hint 14). When the inputs A, B, Bin is (0,0,0) then the Borrow output of full subtractor is________? 0 1 X All the above Hint 15). When the inputs A, B, Bin is (0,0,1) then the Borrow output of full subtractor is________? 0 1 X All the above Hint 16). When the inputs A, B, Bin is (0,1,0) then the Borrow output of full subtractor is________? 0 1 X All the above Hint 17). When the inputs A, B, Bin is (0,1,1) then the Borrow output of full subtractor is________? 0 1 X All the above Hint 18). When the inputs A, B, Bin is (1,0,0) then the Borrow output of full subtractor is________? 0 1 X All the above Hint 19). When the inputs A, B, Bin is (1,0,1) then the Borrow output of full subtractor is________? 0 1 X All the above Hint 20). When the inputs A, B, Bin is (1,1,0) then the Borrow output of full subtractor is________? 0 1 X All the above Hint 21). When the inputs A, B, Bin is (1,1,1) then the Borrow output of full subtractor is________? 0 1 X All the above Hint 22). Which of the following is used to represent full subtractor logical circuits equation? K-map Q-map Graph All the above Hint 23). Identify the logical Difference ‘D’ equation obtained for 3bit full subtractor given in below figure? Truth Table A’B’Bin + AB’ B’in + ABBin A’Bin + A’B + BBin A’B’Bin + AB’ B’in A’B’Bin + ABBin Hint 24). Identify the logical Borrow out ‘Bout’ equation obtained for 3bit full subtractor given in below figure? Add description here Truth Table A’B’Bin + AB’ B’in + ABBin A’Bin + A’B + BBin A’B’Bin + AB’ B’in A’B’Bin + ABBin Hint 25). How many logic gates do a full subtractor requires? 4 5 6 7 Hint Full Subtractor Questions and Answers for Exams 26). Which of the following gates do full subtractor Difference component requires to obtain output? XOR AND NOT OR Hint Read more about XOR gate. 27). Which of the following gates do full subtractor Borrow component requires to obtain output? XOR AND NOT OR All the above Hint 28). Which of the following is the first step to obtain Difference equation of full subtractor? Calculate XOR operation on inputs A and B Calculate XOR with Borrow Represent the equation All the above Hint 29). Which of the following is the second step to obtain Difference equation of full subtractor? Calculate XOR operation on inputs A and B Calculate XOR with Borrow Represent the equation All the above Hint 30). Which of the following is the third step to obtain Difference equation of full subtractor? Calculate XOR operation on inputs A and B Calculate XOR with Borrow Represent the equation All the above Hint 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 inputs Do XOR operation of 2inputs Do OR operation of 2 outputs of previous step All the above Hint 32). Which of the following is the second step of Borrow equation of full subtractor? Do AND operation of 2 inputs Do XOR operation of 2inputs Do OR operation of 2 outputs of previous step All the above Hint 33). Which of the following is the third step of Borrow equation of full subtractor? Do AND operation of 2 inputs Do XOR operation of 2inputs Do OR operation of 2 outputs of previous step All the above Hint 34). The input to full subtractor is in ___ form? Binary Analog Signal Both a and b Hint 35). Which of the following circuit is used in full subtractor? Adder Subtractor Multiplexer Decoder Hint 36). A logical subtractor is classified into ___ types? 2 3 4 5 Hint 37). Which of the following are the labels of full subtractor inputs? Minuend Subtrahend Borrow All the above Hint 38. How many logic gates a full subtractors is implemented with? 3 4 5 6 Hint 39). Which of the following gate provide difference output of a full subtractor? OR XOR AND NAND Hint 40). Which of the following gates provide Borrow out of a full subtractor? OR AND NOT All the above Hint 41). A minuend component of a full subtractor is also called ______? Inverted input Noninverted input Carry input All the above Hint 42). A Subtrahend component of a full subtractor is also called ______? Inverted input Noninverted input Carry input All the above Hint 43). The LSB of output obtained from a full subtractor is called ____ component? Inverted input Noninverted input Carry input All the above Hint 44). Which of the following represent the value of signal of a full adder when the input logic is 1? High Low Infinite None of the above Hint 45). Which of the following represent the value of signal of a full adder when the input logic is 0? High Low Infinite None of the above Hint 46). Which of the following are the advantages of a subtractor? Simple in design Power saver High speed All the above Hint 47). Which of the following is the disadvantages of a subtractor? Does not require accept borrow input at initial stage Delay while processing High power dissipation All the above Hint 48). Which of the following are the applications of a full subtractor? Computers Microcontrollers Processors All the above Hint Read more about Microcontrollers. 49). Subtractors in computers perform ______operation? Arithmetic Logic Graphical All the above Hint 50). Which of the following includes athematic operation? Addition Subtraction Multiplication All the above Hint Full Subtractor Important Questions for Interviews 51). Which of the following operation do full subtractors processors do? Compute tables Addresses Points All the above Hint 52). Which of the following operation do a full subtractor controllers do? Arithmetic subtraction Timers Program counter All the above Hint 53). Which of the following is the 1 st step performed in full subtractor K-map? Choose K-map based on variables availability Find min terms and max terms Place 1’s for SOP Place 0’s for POS Hint 54). Which of the following is the 2 nd step performed in full subtractor K-map? Choose K-map based on variables availability Find min terms and max terms Place 1’s for SOP Place 0’s for POS Hint 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 availability Find min terms and max terms Place 1’s for SOP Place 0’s for POS Hint 56). Which of the following is the 4 th step performed in full subtractor K-map? Choose K-map based on variables availability Find min terms and max terms Place 1’s for SOP Place 0’s for POS Hint 57). Which of the following is the 5 th step performed in full subtractor K-map? Place 1’s for SOP Place 0’s for POS Group terms with rectangle box Represent SOP and POS terms in form of equation Hint 58). Which of the following is the 5 th step performed in full subtractor K-map? Place 1’s for SOP Place 0’s for POS Group terms with rectangle box Represent SOP and POS terms in form of equation Hint 59). Which of the following is the advantage of a k-map? Simplifies Boolean equations Fewer steps Easy method All the above Hint 60). Which of the following are the disadvantages of a K-map? Complex process Non unique solution is obtained Difficult method Both a and b Hint 61. Which of the following method do K-map overcomes? Boolean algebra law DeMorgans theorem Graphical representation Both a and b Hint 62). A K-map is also called as ____? 2D tables 3D tables 4D tables 5D tables Hint 63). K-map is expressed to the power of n with a base____? 1 2 3 10 Hint 64). While performing subtraction of 1 and 0 the term used is ______? Borrow Carry Output Input Hint 65). A full subtractor has similar result that of _______? Half adder Half subtractor Full adder Full multiplexer Hint 66). Which of the following is the symbol for a full subtractor? + - * / Hint 67). Which of the following operation do a logical gate performs? Arithmetic Logical Boolean All the above Hint 68). Which of the following digital components are used while implementing logic gates? Transistors Diodes Resistors All the above Hint 69). When the input signal for a full subtractor is logic 1 it represents the signal is _________? High Low Toggled Both b and c Hint 70). When the input signal for a full subtractor is logic 0 it represents the signal is _________? High Low Toggled Both b and c Hint 71). When the input signal for a full subtractor is fluctuating between logic 0 and 1 it represents the signal is__? High Low Toggled Both b and c Hint 72). ___ is also know as time independent logic circuit? Digital logic circuit Combinational logic circuit Sequential circuit Both a and b Hint Read more about the Combinational logic circuits. 73). A combination logic circuit performs ____ operation? Arithmetic Boolean Logical All the above Hint 74). How many methods does a combinational circuit uses? 1 2 3 4 Hint 75). A Boolean type circuit is a combinational ____ type of circuit? Digital Analogue Physics All the above Hint Full Subtractor Quiz Questions and Answers 76). In digital electronics Boolean type circuits are represented using _____? Gates Resistors Wires Load Hint 77). Which of the following are the examples of Boolean type circuits? AND OR NAND All the above Hint 78). Which of the following are the applications of Boolean type circuits? Adders Subtractors Multiplexers All the above Hint Read more about Multiplexers. 79). Which of the following are omitted by Boolean type circuit? Metastability Power consumption Glitches All the above Hint 80). Which of the following parameters are measured using Boolean circuits? Circuit size Alterations made Depth of circuit All the above Hint 81). Logic gates are implemented using _____? Transistors Diodes Resistors All the above Hint Read more about Diodes. 82). Which of the following are the applications of logic circuits? Registers Multiplexers CPU memory All the above Hint 83). A truth table of any digital gate is used to represent____? Boolean algebra Boolean function Propositional calculus All the above Hint 84). How many parts a combinational logic circuits are classified? 2 3 4 5 Hint 85). Which of the following is the classification of code converter combinational logic type circuit? BCD PLD’s Encoders Adders Hint 86). Which of the following is the classification of data transmission combinational logic type circuit? BCD PLD’s Encoders Adders Hint 87). Which of the following is the classification of ALU combinational logic type circuit? BCD De-MUX Mux Adders Hint 88). How many components do a sequential type digital circuit contains? 2 3 4 5 Hint 89). The output of combinational logic circuit in a sequential type circuit is given to ____? Memory unit Comparator Input of combinational logic circuit All the above Hint 90). Which of the following are the advantages of a full subtractor? Cascades multiple half subtractors Employs 2’s complement Uses full adder All the above Hint 91). Which of the following components are required for implementing a full subtractor practically? 74LS283N NOT gate Adder All the above Hint 92). A 74LS283N IC is a ___ TTL type chip? Full adder Full subtractor Half adder Half subtractor Hint 93). How many pins do 74LS283N Full subtractor IC has? 5 8 16 32 Hint 94). Which of the following pin of 74LS283N Full subtractor IC is VCC? Pin 2 Pin 4 Pin 14 Pin 16 Hint 95). Which of the following pin of 74LS283N Full subtractor IC is GND? Pin 2 Pin 4 Pin 8 Pin 16 Hint 96). Which of the following pin of 74LS04 of NOT gate IC is GND? Pin 2 Pin 4 Pin 8 Pin 7 Hint 97). Which of the following pin of 74LS04 of NOT gate IC is VCC? Pin 2 Pin 14 Pin 8 Pin 7 Hint 98). How many pins do 74LS04 of NOT gate IC has? 4 5 8 14 Hint 99). Which of the following is the disadvantage of full subtractor? Absence of borrow bit Complex design Delay All the above Hint 100). Which of the following is the formula for 2’s complement? 2^n 3^m 10^n All the above Hint Time is Up! Time's up
