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 None Hint Read more about the electronic circuits. 2). A full subtractor performs subtraction minimum of ___ number of inputs? 2 3 4 1 None Hint 3). A full subtractor is a combination of ____ component? Half adders Half subtractors Full adders Half multiplexers None Hint 4). How many inputs do a full subtractors have? 2 3 4 5 None Hint 5). How many outputs do a full subtractors have? 2 3 4 5 None 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 None 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 None 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 None 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 None 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 None 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 None 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 None 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 None 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 None 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 None 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 None 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 None 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 None 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 None 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 None 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 None Hint 22). Which of the following is used to represent full subtractor logical circuits equation? K-map Q-map Graph All the above None 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 None 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 None Hint 25). How many logic gates do a full subtractor requires? 4 5 6 7 None 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 None 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 None 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 None 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 None 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 None 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 None 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 None 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 None Hint 34). The input to full subtractor is in ___ form? Binary Analog Signal Both a and b None Hint 35). Which of the following circuit is used in full subtractor? Adder Subtractor Multiplexer Decoder None Hint 36). A logical subtractor is classified into ___ types? 2 3 4 5 None Hint 37). Which of the following are the labels of full subtractor inputs? Minuend Subtrahend Borrow All the above None Hint 38. How many logic gates a full subtractors is implemented with? 3 4 5 6 None Hint 39). Which of the following gate provide difference output of a full subtractor? OR XOR AND NAND None Hint 40). Which of the following gates provide Borrow out of a full subtractor? OR AND NOT All the above None Hint 41). A minuend component of a full subtractor is also called ______? Inverted input Noninverted input Carry input All the above None Hint 42). A Subtrahend component of a full subtractor is also called ______? Inverted input Noninverted input Carry input All the above None Hint 43). The LSB of output obtained from a full subtractor is called ____ component? Inverted input Noninverted input Carry input All the above None 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 None 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 None Hint 46). Which of the following are the advantages of a subtractor? Simple in design Power saver High speed All the above None 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 None Hint 48). Which of the following are the applications of a full subtractor? Computers Microcontrollers Processors All the above None Hint Read more about Microcontrollers. 49). Subtractors in computers perform ______operation? Arithmetic Logic Graphical All the above None Hint 50). Which of the following includes athematic operation? Addition Subtraction Multiplication All the above None 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 None Hint 52). Which of the following operation do a full subtractor controllers do? Arithmetic subtraction Timers Program counter All the above None 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 None 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 None 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 None 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 None 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 None 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 None Hint 59). Which of the following is the advantage of a k-map? Simplifies Boolean equations Fewer steps Easy method All the above None 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 None Hint 61. Which of the following method do K-map overcomes? Boolean algebra law DeMorgans theorem Graphical representation Both a and b None Hint 62). A K-map is also called as ____? 2D tables 3D tables 4D tables 5D tables None Hint 63). K-map is expressed to the power of n with a base____? 1 2 3 10 None Hint 64). While performing subtraction of 1 and 0 the term used is ______? Borrow Carry Output Input None Hint 65). A full subtractor has similar result that of _______? Half adder Half subtractor Full adder Full multiplexer None Hint 66). Which of the following is the symbol for a full subtractor? + - * / None Hint 67). Which of the following operation do a logical gate performs? Arithmetic Logical Boolean All the above None Hint 68). Which of the following digital components are used while implementing logic gates? Transistors Diodes Resistors All the above None 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 None 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 None 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 None Hint 72). ___ is also know as time independent logic circuit? Digital logic circuit Combinational logic circuit Sequential circuit Both a and b None Hint Read more about the Combinational logic circuits. 73). A combination logic circuit performs ____ operation? Arithmetic Boolean Logical All the above None Hint 74). How many methods does a combinational circuit uses? 1 2 3 4 None Hint 75). A Boolean type circuit is a combinational ____ type of circuit? Digital Analogue Physics All the above None Hint Full Subtractor Quiz Questions and Answers 76). In digital electronics Boolean type circuits are represented using _____? Gates Resistors Wires Load None Hint 77). Which of the following are the examples of Boolean type circuits? AND OR NAND All the above None Hint 78). Which of the following are the applications of Boolean type circuits? Adders Subtractors Multiplexers All the above None Hint Read more about Multiplexers. 79). Which of the following are omitted by Boolean type circuit? Metastability Power consumption Glitches All the above None Hint 80). Which of the following parameters are measured using Boolean circuits? Circuit size Alterations made Depth of circuit All the above None Hint 81). Logic gates are implemented using _____? Transistors Diodes Resistors All the above None Hint Read more about Diodes. 82). Which of the following are the applications of logic circuits? Registers Multiplexers CPU memory All the above None Hint 83). A truth table of any digital gate is used to represent____? Boolean algebra Boolean function Propositional calculus All the above None Hint 84). How many parts a combinational logic circuits are classified? 2 3 4 5 None Hint 85). Which of the following is the classification of code converter combinational logic type circuit? BCD PLD’s Encoders Adders None Hint 86). Which of the following is the classification of data transmission combinational logic type circuit? BCD PLD’s Encoders Adders None Hint 87). Which of the following is the classification of ALU combinational logic type circuit? BCD De-MUX Mux Adders None Hint 88). How many components do a sequential type digital circuit contains? 2 3 4 5 None 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 None 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 None Hint 91). Which of the following components are required for implementing a full subtractor practically? 74LS283N NOT gate Adder All the above None Hint 92). A 74LS283N IC is a ___ TTL type chip? Full adder Full subtractor Half adder Half subtractor None Hint 93). How many pins do 74LS283N Full subtractor IC has? 5 8 16 32 None Hint 94). Which of the following pin of 74LS283N Full subtractor IC is VCC? Pin 2 Pin 4 Pin 14 Pin 16 None Hint 95). Which of the following pin of 74LS283N Full subtractor IC is GND? Pin 2 Pin 4 Pin 8 Pin 16 None Hint 96). Which of the following pin of 74LS04 of NOT gate IC is GND? Pin 2 Pin 4 Pin 8 Pin 7 None Hint 97). Which of the following pin of 74LS04 of NOT gate IC is VCC? Pin 2 Pin 14 Pin 8 Pin 7 None Hint 98). How many pins do 74LS04 of NOT gate IC has? 4 5 8 14 None Hint 99). Which of the following is the disadvantage of full subtractor? Absence of borrow bit Complex design Delay All the above None Hint 100). Which of the following is the formula for 2’s complement? 2^n 3^m 10^n All the above None Hint Time's up
