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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?
HintOne of the classification of electronic circuits
Read more about the electronic circuits.
2). A full subtractor performs subtraction minimum of ___ number of inputs?
HintMinimum number
3). A full subtractor is a combination of ____ component?
Hintcombination of 2 subtractor.
4). How many inputs do a full subtractors have?
Hintabove minimum number
5). How many outputs do a full subtractors have?
HintMinimum value
6). When the inputs A, B, Bin is (0,0,0) then the Difference output of full subtractor is________?
Hintproduct with 0 is always.
7). When the inputs A, B, Bin is (0,0,1) then the Difference output of full subtractor is________?
Hintaddition of 0's with 1.
8). When the inputs A, B, Bin is (0,1,0) then the Difference output of full subtractor is________?
HintAddition of 0 and 1.
9). When the inputs A, B, Bin is (1,0,0) then the Difference output of full subtractor is________?
HintAddition of 0 and 1.
10). When the inputs A, B, Bin is (0,1,1) then the Difference output of full subtractor is________?
HintProduct of any term with 0 is
11). When the inputs A, B, Bin is (1,0,1) then the Difference output of full subtractor is________?
HintProduct of any term with 0 is?
12). When the inputs A, B, Bin is (1,1,0) then the Difference output of full subtractor is________?
HintProduct of any term with 0 is?
13). When the inputs A, B, Bin is (1,11) then the Difference output of full subtractor is________?
Hintaddition of 0's with 1.
14). When the inputs A, B, Bin is (0,0,0) then the Borrow output of full subtractor is________?
Hintaddition of 0's with 1.
15). When the inputs A, B, Bin is (0,0,1) then the Borrow output of full subtractor is________?
HintAddition of 0's with 1 is?
16). When the inputs A, B, Bin is (0,1,0) then the Borrow output of full subtractor is________?
HintAddition of 0's with 1.
17). When the inputs A, B, Bin is (0,1,1) then the Borrow output of full subtractor is________?
Hintaddition of 0's with 1.
18). When the inputs A, B, Bin is (1,0,0) then the Borrow output of full subtractor is________?
Hintproduct with 0 is always.
19). When the inputs A, B, Bin is (1,0,1) then the Borrow output of full subtractor is________?
HintProduct of any term with 0 is?
20). When the inputs A, B, Bin is (1,1,0) then the Borrow output of full subtractor is________?
HintProduct of any term with 0 is?
21). When the inputs A, B, Bin is (1,1,1) then the Borrow output of full subtractor is________?
HintAddition of 0's with 1.
22). Which of the following is used to represent full subtractor logical circuits equation?
HintMap that represents logic gates.
23). Identify the logical Difference ‘D’ equation obtained for 3bit full subtractor given in below figure?
Truth Table

Truth Table

HintConsidering all ones by pairing together and obtaining equation.
24). Identify the logical Borrow out ‘Bout’ equation obtained for 3bit full subtractor given in below figure?
Add description here
Truth Table

Truth Table

HintObtained by pairing two 1’s from K-map.
25). How many logic gates do a full subtractor requires?
HintHas 2 basic logic gates and 1 combination of inverter and basic gate.

Full Subtractor Questions and Answers for Exams

26). Which of the following gates do full subtractor Difference component requires to obtain output?
HintProvides output as 1 if it has at least single input as 1.
Read more about XOR gate.
27). Which of the following gates do full subtractor Borrow component requires to obtain output?
HintHas 3 basic gates.
28). Which of the following is the first step to obtain Difference equation of full subtractor?
HintOnly single operation to be performed without carry or borrow.
29). Which of the following is the second step to obtain Difference equation of full subtractor?
HintPerform with the help of neighbor digit.
30). Which of the following is the third step to obtain Difference equation of full subtractor?
HintFinal step after calculating what should be done next?
Read more about Full Subtractor.
31). Which of the following is the first step of Borrow equation of full subtractor?
HintPerforms product operation.
32). Which of the following is the second step of Borrow equation of full subtractor?
HintPerforms on 2 inputs.
33). Which of the following is the third step of Borrow equation of full subtractor?
HintPerforms on 2 outputs.
34). The input to full subtractor is in ___ form?
HintForm of 0's and 1's.
35). Which of the following circuit is used in full subtractor?
HintUnit that performs deduction process.
36). A logical subtractor is classified into ___ types?
HintMinimum value.
37). Which of the following are the labels of full subtractor inputs?
Hint3 Components.
38. How many logic gates a full subtractors is implemented with?
HintDouble the number of gates in 2 half adders.
39). Which of the following gate provide difference output of a full subtractor?
HintOutput value of the logic gate is 1 if odd number of 1's exists.
40). Which of the following gates provide Borrow out of a full subtractor?
HintBasic logic gates.
41). A minuend component of a full subtractor is also called ______?
HintA positive terminal also called?
42). A Subtrahend component of a full subtractor is also called ______?
HintNegative terminal also called?
43). The LSB of output obtained from a full subtractor is called ____ component?
HintA component that takes output from the resultant and sends input to next component to perform subtraction.
44). Which of the following represent the value of signal of a full adder when the input logic is 1?
HintMaximum value.
45). Which of the following represent the value of signal of a full adder when the input logic is 0?
HintMinimum value.
46). Which of the following are the advantages of a subtractor?
HintThe advantages of a subtractor includes simple in design, power saver and high speed.
47). Which of the following is the disadvantages of a subtractor?
HintAll the design parameters.
48). Which of the following are the applications of a full subtractor?
HintAll the electronic application.
Read more about Microcontrollers.
49). Subtractors in computers perform ______operation?
HintAll the ALU and graphical performance.
50). Which of the following includes athematic operation?
HintAll the mathematical operation.

Full Subtractor Important Questions for Interviews

51). Which of the following operation do full subtractors processors do?
Hintmaximum number of operations.
52). Which of the following operation do a full subtractor controllers do?
HintMaximum number of
53). Which of the following is the 1 st step performed in full subtractor K-map?
HintDraw map.
54). Which of the following is the 2 nd step performed in full subtractor K-map?
HintFind terms.
Read more about K-map.
55). Which of the following is the 3 rd step performed in full subtractor K-map?
HintRepresent binary digit.
56). Which of the following is the 4 th step performed in full subtractor K-map?
HintRepresent binary digit.
57). Which of the following is the 5 th step performed in full subtractor K-map?
HintPair equal digits.
58). Which of the following is the 5 th step performed in full subtractor K-map?
HintRepresent in equation
59). Which of the following is the advantage of a k-map?
HintPerforms mathematical tasks.
60). Which of the following are the disadvantages of a K-map?
HintDifficult to perform.
61. Which of the following method do K-map overcomes?
HintMathematical representation
62). A K-map is also called as ____?
HintX and Y coordinates.
63). K-map is expressed to the power of n with a base____?
HintBinary value.
64). While performing subtraction of 1 and 0 the term used is ______?
Hint0-1+?
65). A full subtractor has similar result that of _______?
HintPerforms sum of 3 values.
66). Which of the following is the symbol for a full subtractor?
HintSubtraction.
67). Which of the following operation do a logical gate performs?
HintMathematical operations.
68). Which of the following digital components are used while implementing logic gates?
HintPassive components.
69). When the input signal for a full subtractor is logic 1 it represents the signal is _________?
HintMaximum value.
70). When the input signal for a full subtractor is logic 0 it represents the signal is _________?
HintMinimum value.
71). When the input signal for a full subtractor is fluctuating between logic 0 and 1 it represents the signal is__?
HintFluctuate value.
72). ___ is also know as time independent logic circuit?
HintElectronic circuit is also named as?
Read more about the Combinational logic circuits.
73). A combination logic circuit performs ____ operation?
HintAll the electronic circuits representation methods.
74). How many methods does a combinational circuit uses?
HintBinary value also represented in number as?
75). A Boolean type circuit is a combinational ____ type of circuit?
HintElectronic circuit also called?

Full Subtractor Quiz Questions and Answers

76). In digital electronics Boolean type circuits are represented using _____?
HintComponent that acts like switch.
77). Which of the following are the examples of Boolean type circuits?
HintDigital gates.
78). Which of the following are the applications of Boolean type circuits?
HintMathematical calculating device.
Read more about Multiplexers.
79). Which of the following are omitted by Boolean type circuit?
HintError quantities.
80). Which of the following parameters are measured using Boolean circuits?
HintModifications and their impacts.
81). Logic gates are implemented using _____?
HintPassive components.
Read more about Diodes.
82). Which of the following are the applications of logic circuits?
HintComputer components.
83). A truth table of any digital gate is used to represent____?
HintRelated to solving digital circuits.
84). How many parts a combinational logic circuits are classified?
HintDual values.
85). Which of the following is the classification of code converter combinational logic type circuit?
HintElectronic data representation.
86). Which of the following is the classification of data transmission combinational logic type circuit?
HintComponent with single input and Multiple outputs.
87). Which of the following is the classification of ALU combinational logic type circuit?
HintPerforms addition.
88). How many components do a sequential type digital circuit contains?
HintDual
89). The output of combinational logic circuit in a sequential type circuit is given to ____?
HintComponent that stores data.
90). Which of the following are the advantages of a full subtractor?
HintComponents that performs logical basic mathematical operation.
91). Which of the following components are required for implementing a full subtractor practically?
HintIC and logic gate.
92). A 74LS283N IC is a ___ TTL type chip?
HintHas minuend as component.
93). How many pins do 74LS283N Full subtractor IC has?
Hint8+8=?
94). Which of the following pin of 74LS283N Full subtractor IC is VCC?
HintLast pin.
95). Which of the following pin of 74LS283N Full subtractor IC is GND?
Hint4+4=?
96). Which of the following pin of 74LS04 of NOT gate IC is GND?
HintPin before GND pin of IC.
97). Which of the following pin of 74LS04 of NOT gate IC is VCC?
Hint7+7=?
98). How many pins do 74LS04 of NOT gate IC has?
Hint7+7=?
99). Which of the following is the disadvantage of full subtractor?
HintComplicated task.
100). Which of the following is the formula for 2’s complement?
HintBinary value also called?
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