McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Computer Science Engineering (CSE) .
| 101. |
The decimal number system represents the decimal number in the form of |
| A. | hexadecimal |
| B. | binary coded |
| C. | octal |
| D. | decimal |
| Answer» B. binary coded | |
| Explanation: binary-coded decimal (bcd) is a class of binary encodings of decimal numbers where each decimal digit is represented by a fixed number of bits, usually four or eight. hexadecimal and octal are number systems having base 16 and 8 respectively. | |
| 102. |
29 input circuit will have total of |
| A. | 32 entries |
| B. | 128 entries |
| C. | 256 entries |
| D. | 512 entries |
| Answer» D. 512 entries | |
| Explanation: 29 input circuit would have 512(2*2*2*2*2*2*2*2*2 = 512) entries. | |
| 103. |
BCD adder can be constructed with 3 IC packages each of |
| A. | 2 bits |
| B. | 3 bits |
| C. | 4 bits |
| D. | 5 bits |
| Answer» C. 4 bits | |
| Explanation: binary-coded decimal (bcd) is a class of binary encodings of decimal numbers where each decimal digit is represented by a fixed number of bits, usually four or eight. bcd adder can be constructed with 3 ic packages. each of 4-bit adders is an msi(medium scale integration) function and 3 gates for the correction logic need one ssi (small scale integration) package. | |
| 104. |
The output sum of two decimal digits can be represented in |
| A. | gray code |
| B. | excess-3 |
| C. | bcd |
| D. | hexadecimal |
| Answer» C. bcd | |
| Explanation: the output sum of two decimal digits can be represented in bcd(binary-coded decimal). binary-coded decimal (bcd) is a class of binary encodings of decimal numbers where each decimal digit is represented by a fixed number of bits, usually four or eight. | |
| 105. |
The addition of two decimal digits in BCD can be done through |
| A. | bcd adder |
| B. | full adder |
| C. | ripple carry adder |
| D. | carry look ahead |
| Answer» A. bcd adder | |
| Explanation: the addition of two decimal digits in bcd can be done through bcd adder. every input inserted, in addition by the user converted into binary and then proceed for the addition. whereas, full adder, ripple carry adder and carry look adder are for the addition of binary bits. | |
| 106. |
3 bits full adder contains |
| A. | 3 combinational inputs |
| B. | 4 combinational inputs |
| C. | 6 combinational inputs |
| D. | 8 combinational inputs |
| Answer» D. 8 combinational inputs | |
| Explanation: 3 bits full adder contains 23 = 8 combinational inputs. | |
| 107. |
The simplified expression of full adder carry is |
| A. | c = xy+xz+yz |
| B. | c = xy+xz |
| C. | c = xy+yz |
| D. | c = x+y+z |
| Answer» A. c = xy+xz+yz | |
| Explanation: a full adder is a combinational circuit having 3 inputs and 2 outputs, namely sum and carry. the simplified expression of full adder carry is c = xy+xz+yz. | |
| 108. |
Decimal digit in BCD can be represented by |
| A. | 1 input line |
| B. | 2 input lines |
| C. | 3 input lines |
| D. | 4 input lines |
| Answer» D. 4 input lines | |
| Explanation: binary-coded decimal (bcd) is a class of binary encodings of decimal numbers where each decimal digit is represented by a fixed number of bits, usually four or eight. decimal digit in bcd can be represented by 4 input lines. since it is constructed with 4-bits. | |
| 109. |
The number of logic gates and the way of their interconnections can be classified as |
| A. | logical network |
| B. | system network |
| C. | circuit network |
| D. | gate network |
| Answer» A. logical network | |
| Explanation: the number of different levels of logic gates is represented in a fashion which is known as a logical network. | |
| 110. |
The addition 1+1 gives 0 as a result. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: the two result obtained is 0 with a carry of 1. this carry is transferred to the next higher column. | |
| 111. |
The result of 0*1 in binary is |
| A. | 0 |
| B. | 1 |
| C. | invalid |
| D. | 10 |
| Answer» A. 0 | |
| Explanation: the binary multiplication of any number with 0 will give the result 0 itself. any binary number when multiplied by 0 gives 0 only. | |
| 112. |
The multiplication of 110 * 111 is performed. What is a general term used for 111? |
| A. | dividend |
| B. | quotient |
| C. | multiplicand |
| D. | multiplier |
| Answer» D. multiplier | |
| Explanation: 111 is called the multiplier. | |
| 113. |
What do you call the intermediate terms in binary multiplication? |
| A. | multipliers |
| B. | mid terms |
| C. | partial products |
| D. | multiplicands |
| Answer» C. partial products | |
| Explanation: the intermediate terms are called partial terms. the mid terms obtained in the binary multiplications are the partial ones whereas the answer obtained is called the final product. | |
| 114. |
The result that is smaller than the smallest number obtained is referred to as |
| A. | nan |
| B. | underflow |
| C. | smallest |
| D. | mantissa |
| Answer» B. underflow | |
| Explanation: it is referred to as underflow. nan stands for not a number. mantissa is the part after the decimal. | |
| 115. |
The number of sign bits in a 32-bit IEEE format is |
| A. | 1 |
| B. | 11 |
| C. | 9 |
| D. | 23 |
| Answer» A. 1 | |
| Explanation: there is only 1 sign bit in all the standards. in a 32-bit format, there is 1 sign bit, 8 bits for the exponent and 23 bits for the mantissa. | |
| 116. |
Express the decimal format of the signed binary number (101010)2 . |
| A. | 10 |
| B. | 12 |
| C. | -12 |
| D. | -10 |
| Answer» D. -10 | |
| Explanation: the first bit is the sign bit whereas the | |
| 117. |
All the comparisons made by comparator is done using |
| A. | 1 circuit |
| B. | 2 circuits |
| C. | 3 circuits |
| D. | 4 circuits |
| Answer» A. 1 circuit | |
| Explanation: a comparator is a combinational circuit that takes two numbers as input in binary form and results whether one input is greater, lesser or equal to the other input. because, all the input is compared to each other, therefore it is possible only by using 1 circuit. | |
| 118. |
One that is not the outcome of magnitude comparator is |
| A. | a > b |
| B. | a – b |
| C. | a < b |
| D. | a = b |
| Answer» B. a – b | |
| Explanation: a comparator is a combinational circuit that takes two numbers as input in binary form and results whether one input is greater, lesser or equal to the other input. in a digital comparator, only 3 outputs are possible (i.e. a = b, a > b, a < b). so, a – b is incorrect option. | |
| 119. |
If two numbers are not equal then binary variable will be |
| A. | 0 |
| B. | 1 |
| C. | a |
| D. | b |
| Answer» A. 0 | |
| Explanation: a comparator is a combinational circuit that takes two numbers as input in binary form and results whether one input is greater, lesser or equal to the other input. in a digital comparator, only 3 outputs are possible (i.e. a = b, a >b, a < b). other than this, the output will be 0. | |
| 120. |
How many inputs are required for a digital comparator? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» A. 1 | |
| Explanation: a comparator is a combinational circuit that takes two numbers as input in binary form and results whether one input is greater, lesser or equal to the other input. thus, there are two inputs required for a digital comparator (i.e. a & b). | |
| 121. |
In a comparator, if we get input as A>B then the output will be |
| A. | 1 |
| B. | 0 |
| C. | a |
| D. | b |
| Answer» A. 1 | |
| Explanation: a comparator is a combinational circuit that takes two numbers as input in binary form and results whether one input is greater, lesser or equal to the other input. if a > b, it means that it satisfies one of the condition among three. hence the output will be 1. | |
| 122. |
Which one is a basic comparator? |
| A. | xor |
| B. | xnor |
| C. | and |
| D. | nand |
| Answer» A. xor | |
| Explanation: generally, an xnor outputs high for even number of 1s or all 0s and outputs low for otherwise. thus, an xnor gate is a basic comparator, because its output is “1” only if its two input bits are equal. | |
| 123. |
Comparators are used in |
| A. | memory |
| B. | cpu |
| C. | motherboard |
| D. | hard drive |
| Answer» B. cpu | |
| Explanation: comparators are used in central processing unit (cpus). because all the arithmetic and logical operations are performed in the alu(arithmetic logic unit) part of the cpu. | |
| 124. |
A circuit that compares two numbers and determine their magnitude is called |
| A. | height comparator |
| B. | size comparator |
| C. | comparator |
| D. | magnitude comparator |
| Answer» D. magnitude comparator | |
| Explanation: a comparator is a combinational circuit that takes two numbers as input in binary form and results whether one input is greater, lesser or equal to the other input. a circuit that compares two numbers and determine their magnitude is called magnitude comparator. | |
| 125. |
A procedure that specifies finite set of steps is called |
| A. | algorithm |
| B. | flow chart |
| C. | chart |
| D. | venn diagram |
| Answer» A. algorithm | |
| Explanation: a procedure that specifies finite set of steps is called algorithm, while a flowchart is a pictorial representation of the algorithm. | |
| 126. |
How many types of digital comparators are? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| Explanation: there are two main types of digital comparator available and these are: identity comparator & magnitude comparator. identity comparator checks only the equality of the inputs and thus has one output terminal. while magnitude comparator checks for greater than, less than as well as equality of the inputs, and thus has 3 output terminals. | |
| 127. |
An identify comparator is defined as a digital comparator which has |
| A. | only one output terminal |
| B. | two output terminals |
| C. | three output terminals |
| D. | no output terminal |
| Answer» A. only one output terminal | |
| Explanation: an identity comparator is a digital comparator that has only one output terminal for when a = b either “high” a = b = 1 or “low” a = b = 0. | |
| 128. |
A magnitude comparator is defined as a digital comparator which has |
| A. | only one output terminal |
| B. | two output terminals |
| C. | three output terminals |
| D. | no output terminal |
| Answer» C. three output terminals | |
| Explanation: a magnitude comparator is a digital comparator which has three output terminals, one each for equality, a = b greater than, a > b and less than a | |
| 129. |
The purpose of a Digital Comparator is |
| A. | to convert analog input into digital |
| B. | to create different outputs |
| C. | to add a set of different numbers |
| D. | to compare a set of variables or unknown numbers |
| Answer» D. to compare a set of variables or unknown numbers | |
| Explanation: a comparator is a combinational circuit that takes two numbers as input in binary form and results whether one input is greater, lesser or equal to the other input. the purpose of a digital comparator is to compare a set of variables or unknown numbers, for example a (a1, a2, a3, …. an, etc) against that of a constant or unknown value such as b (b1, b2, b3, …. bn, etc) and produce an output condition or flag depending upon the result of the comparison. | |
| 130. |
TTL 74LS85 is a |
| A. | 1-bit digital comparator |
| B. | 4-bit magnitude comparator |
| C. | 8-bit magnitude comparator |
| D. | 8-bit word comparator |
| Answer» B. 4-bit magnitude comparator | |
| Explanation: ttl 74ls85 is a 4-bit magnitude comparator. | |
| 131. |
How many inputs will a decimal-to-BCD encoder have? |
| A. | 4 |
| B. | 8 |
| C. | 10 |
| D. | 16 |
| Answer» C. 10 | |
| Explanation: an encoder is a combinational circuit encoding the information of 2n input lines to n output lines, thus producing the binary equivalent of the | |
| 132. |
How many outputs will a decimal-to-BCD encoder have? |
| A. | 4 |
| B. | 8 |
| C. | 12 |
| D. | 16 |
| Answer» A. 4 | |
| Explanation: an encoder is a combinational circuit encoding the information of 2n input lines to n output lines, thus producing the binary equivalent of the input. thus, a decimal to bcd encoder has 4 outputs. | |
| 133. |
How is an encoder different from a decoder? |
| A. | the output of an encoder is a binary code for 1-of-n input |
| B. | the output of a decoder is a binary code for 1-of-n input |
| C. | the output of an encoder is a binary code for n-of-1 output |
| D. | the output of a decoder is a binary code for n-of-1 output |
| Answer» A. the output of an encoder is a binary code for 1-of-n input | |
| Explanation: an encoder is a combinational circuit encoding the information of 2n input lines to n output lines, thus producing the binary equivalent of the input. it performs the opposite operation of a decoder which results in 2n outputs from n inputs. thus, an encoder different from a decoder because of the output of an encoder is a binary code for 1-of-n input. | |
| 134. |
If we record any music in any recorder, such types of process is called |
| A. | multiplexing |
| B. | encoding |
| C. | decoding |
| D. | demultiplexing |
| Answer» B. encoding | |
| Explanation: if we record any music in any recorder, it means that we are giving data to a recorder. so, such process is called encoding. getting back the music from the recorded data, is known as decoding. | |
| 135. |
How many OR gates are required for a Decimal-to- bcd encoder? |
| A. | 2 |
| B. | 10 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| Explanation: an encoder is a combinational circuit encoding the information of 2^n input lines to n output lines, thus producing the binary equivalent of the input. | |
| 136. |
How many OR gates are required for an octal-to- binary encoder? |
| A. | 3 |
| B. | 2 |
| C. | 8 |
| D. | 10 |
| Answer» A. 3 | |
| Explanation: an encoder is a combinational circuit encoding the information of 2n input lines to n output lines, thus producing the binary equivalent of the input. thus, in octal to binary encoder there are 8 (=23) inputs, thus 3 output lines. | |
| 137. |
The discrepancy of 0 output due to all inputs being 0 or D0, being 0 is resolved by using additional input known as |
| A. | enable |
| B. | disable |
| C. | strobe |
| D. | clock |
| Answer» A. enable | |
| Explanation: such problems are resolved by using enable input, which behaves as active if it gets 0 as input since it is an active-low pin. | |
| 138. |
Can an encoder be called as multiplexer? |
| A. | no |
| B. | yes |
| C. | sometimes |
| D. | never |
| Answer» B. yes | |
| Explanation: a multiplexer or mux is a combination circuit that contains more than one input line, one output line and more than one selection line. whereas, an encoder is also considered a type of multiplexer but without a single output line and without any selection lines. | |
| 139. |
If two inputs are active on a priority encoder, which will be coded on the output? |
| A. | the higher value |
| B. | the lower value |
| C. | neither of the inputs |
| D. | both of the inputs |
| Answer» A. the higher value | |
| Explanation: an encoder is a combinational circuit encoding the information of 2n input lines to n output lines, thus producing the binary equivalent of the input. if two inputs are active on a priority encoder, the input of higher value will be coded in the output. | |
| 140. |
What is a multiplexer? |
| A. | it is a type of decoder which decodes several inputs and gives one output |
| B. | a multiplexer is a device which converts many signals into one |
| C. | it takes one input and results into many output |
| D. | it is a type of encoder which decodes several inputs and gives one output |
| Answer» B. a multiplexer is a device which converts many signals into one | |
| Explanation: a multiplexer (or mux) is a device that selects one of several analog or digital input signals and forwards the selected input into a single line, depending on the active select lines. | |
| 141. |
Which combinational circuit is renowned for selecting a single input from multiple inputs & directing the binary information to output line? |
| A. | data selector |
| B. | data distributor |
| C. | both data selector and data distributor |
| D. | demultiplexer |
| Answer» A. data selector | |
| Explanation: data selector is another name of multiplexer. a multiplexer (or mux) is a device that selects one of several analog or digital input signals and forwards the selected input into a single line, depending on the active select lines. | |
| 142. |
It is possible for an enable or strobe input to undergo an expansion of two or more MUX ICs to the digital multiplexer with the proficiency of large number of |
| A. | inputs |
| B. | outputs |
| C. | selection lines |
| D. | enable lines |
| Answer» A. inputs | |
| Explanation: it is possible for an enable or strobe input to undergo an expansion of two or more mux ics to the digital multiplexer with the proficiency of large number of inputs. | |
| 143. |
Which is the major functioning responsibility of the multiplexing combinational circuit? |
| A. | decoding the binary information |
| B. | generation of all minterms in an output function with or-gate |
| C. | generation of selected path between multiple sources and a single destination |
| D. | encoding of binary information |
| Answer» C. generation of selected path between multiple sources and a single destination | |
| Explanation: the major functioning responsibility of the multiplexing combinational circuit is generation of selected path between multiple sources and a single destination because it makes the circuit too flexible. a multiplexer (or mux) is a device that selects one of several analog or digital input signals and forwards the selected input into a single line, depending on the active select lines. | |
| 144. |
What is the function of an enable input on a multiplexer chip? |
| A. | to apply vcc |
| B. | to connect ground |
| C. | to active the entire chip |
| D. | to active one half of the chip |
| Answer» C. to active the entire chip | |
| Explanation: enable input is used to active the chip, when enable is high the chip works (active), when enable is low the chip does not work (memory). | |
| 145. |
One multiplexer can take the place of |
| A. | several ssi logic gates |
| B. | combinational logic circuits |
| C. | several ex-nor gates |
| D. | several ssi logic gates or combinational logic circuits |
| Answer» D. several ssi logic gates or combinational logic circuits | |
| Explanation: a multiplexer (or mux) is a device that selects one of several analog or digital input signals and forwards the selected input into a single line, depending on the active select lines. since many operational behaviour can be performed by using a multiplexer. whereas, a combinational circuit is a combination of many logic gates which makes the circuit more complex. | |
| 146. |
A digital multiplexer is a combinational circuit that selects |
| A. | one digital information from several sources and transmits the selected one |
| B. | many digital information and convert them into one |
| C. | many decimal inputs and transmits the selected information |
| D. | many decimal outputs and accepts the selected information |
| Answer» A. one digital information from several sources and transmits the selected one | |
| Explanation: a digital multiplexer is a combinational circuit that selects one digital information from several | |
| 147. |
In a multiplexer, the selection of a particular input line is controlled by |
| A. | data controller |
| B. | selected lines |
| C. | logic gates |
| D. | both data controller and selected lines |
| Answer» B. selected lines | |
| Explanation: the selection of a particular input line is controlled by a set of selected lines in a multiplexer, which helps to select a particular input from several sources. | |
| 148. |
If the number of n selected input lines is equal to 2^m then it requires select lines. |
| A. | 2 |
| B. | m |
| C. | n |
| D. | 2n |
| Answer» B. m | |
| Explanation: if the number of n selected input lines is equal to 2^m then it requires m select lines to select one of m select lines. | |
| 149. |
How many select lines would be required for an 8- line-to-1-line multiplexer? |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 3 |
| Answer» D. 3 | |
| Explanation: 2n input lines, n control lines and 1 output line available for mux. here, 8 input lines mean 23 inputs. so, 3 control lines are possible. | |
| 150. |
A basic multiplexer principle can be demonstrated through the use of a |
| A. | single-pole relay |
| B. | dpdt switch |
| C. | rotary switch |
| D. | linear stepper |
| Answer» C. rotary switch | |
| Explanation: a basic multiplexer principle can be demonstrated through the use of a rotary switch. since its behaviour is similar to the multiplexer. there are | |
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