Description : The number of control lines for 32 to 1 multiplexer is (A) 4. (B) 5. (C) 16. (D) 6.
Last Answer : Ans: B The number of control lines for 32 (2^5) and to select one input among them total 5 select lines are required.
Description : The number of control lines for 16 to 1 multiplexer is (A) 2. (B) 4. (C) 3. (D) 5.
Last Answer : (B) 4.
Description : How many select lines will a 32:1 multiplexer will have (A) 5. (B) 8. (C) 9. (D) 11.
Last Answer : (A) 5.
Description : How many select lines will a 16 to 1 multiplexer will have (A) 4 (B) 3 (C) 5 (D) 1
Last Answer : (A) 4
Description : The commercially available 8-input multiplexer integrated circuit in the TTL family is (A) 7495. (B) 74153. (C) 74154. (D) 74151.
Last Answer : Ans: B MUX integrated circuit in TTL is 74153.
Description : Define multiplexer
Last Answer : Multiplexer is a digital switch. If allows digital information from several sources to be routed onto a single output line.
Description : A device which converts BCD to Seven Segment is called (A) Encoder (B) Decoder (C) Multiplexer (D) Demultiplexer
Last Answer : Ans: B A device which converts BCD to Seven Segment is called DECODER. (A decoder coverts binary words into alphanumeric characters.)
Description : The device which changes from serial data to parallel data is (A) COUNTER (B) MULTIPLEXER (C) DEMULTIPLEXER (D) FLIP-FLOP
Last Answer : Ans: C The device which changes from serial data to parallel data is demultiplexer. (A demultiplexer takes in data from one line and directs it to any of its N outputs depending on the status of the select inputs.)
Description : Words having 8-bits are to be stored into computer memory. The number of lines required for writing into memory are (A) 1. (B) 2. (C) 4. (D) 8.
Last Answer : Ans: D Because 8-bit words required 8 bit data lines.
Description : Number of control lines required for 16 to 1 multiplexer is
Last Answer : Number of control lines required for 16 to 1 multiplexer is 4
Description : What numeric symbols are used in the binary number system? 58) A) 0 through 8 B) 0, 1, 2 C) 1, 2 D) 0, 1
Last Answer : D) 0, 1
Description : Which of the following memories stores the most number of bits (A) a 5M×8 memory. (B) a 1M × 16 memory. (C) a 5M × 4 memory. (D) a 1M ×12 memory.
Last Answer : Ans: A 5Mx8 = 5 x 220 x 8 = 40M (max)
Description : 1’s complement representation of decimal number of -17 by using 8 bit representation is (A) 1110 1110 (B) 1101 1101 (C) 1100 1100 (D) 0001 0001
Last Answer : (A) 1110 1110
Description : -8 is equal to signed binary number (A) 10001000 (B) 00001000 (C) 10000000 (D) 11000000
Last Answer : (A) 10001000
Description : How many address bits are required to represent 4K memory (A) 5 bits. (B) 12 bits. (C) 8 bits. (D) 10 bits.
Last Answer : (B) 12 bits.
Description : How many flip-flops are required to construct mod 30 counter (A) 5 (B) 6 (C) 4 (D) 8
Last Answer : (A) 5
Description : What is the decimal value of 2-3? 74) A) 0.25 B) 0.75 C) 0.125 D) 0.8
Last Answer : C) 0.125
Description : What is the decimal value of 23? 27) A) 4 B) 8 C) 2 D) 6
Last Answer : A) 00010000
Description : The decimal equivalent of binary 1010000 is ________. 8) A) 9610 B) 8010 C) 7810 D) 8410
Last Answer : A) 9610
Description : Convert the decimal number 10.5 to binary. 92) A) 1100.1000 B) 1010.0101 C) 1010.1000 D) 1011.1000
Last Answer : C) 1010.1000
Description : Convert the decimal number 3.375 to binary. 132) A) 0101.1100 B) 0011.1010 C) 0011.0011 D) 0011.01
Last Answer : D) 0011.01
Description : Any number with an exponent of one is equal to 128) A) two. B) itself. C) zero. D) on
Last Answer : B) itself.
Description : Convert the binary number 0001.0010 to decimal. 121) A) 1.20 B) 1.40 C) 1.125 D)
Last Answer : C) 1.125
Description : How many different symbols are used in the octal number system? 108) A) ten B) two C) seven D) eight
Last Answer : D) eight
Description : Convert the binary number 10010.0100 to decimal. 103) A) 16.25 B) 18.25 C) 18.40 D) 24.50
Last Answer : B) 18.25
Description : Convert the decimal number 0.0625 to binary. 100) A) 0000.0111 B) 0000.1110 C) 0000.0011 D) 0000.0001
Last Answer : D) 0000.0001
Description : Which numbering formats are really codes rather than true number systems? 96) A) hexadecimal and octal B) binary and octal C) decimal and binary D) BCD and ASCII
Last Answer : Which numbering formats are really codes rather than true number systems?
Description : Convert the decimal number 14.875 to binary. 87) A) 1110.0111 B) 1110.1110 C) 1111.1011 D) 1100.1100
Last Answer : B) 1110.1110
Description : How many unique numeric symbols are used in the decimal number system? 47) A) unlimited B) nine C) one D) ten
Last Answer : D) ten
Description : How many symbols are used in the hexadecimal number system? 15) A) sixteen B) six C) ten D) twelve
Last Answer : A) sixteen
Description : Convert the decimal number 6.75 to binary. 14) A) 0110.1100 B) 0111.1100 C) 0110.0110 D) 0110.1010
Last Answer : A) 0110.1100
Description : Convert the decimal number 12.125 to binary. 12) A) 1100.0110 B) 1110.0010 C) 1100.0010 D) 1010.1100
Last Answer : C) 1100.0010
Description : Convert the binary number 0000.1010 to decimal. 6) A) 0.10 B) 0.55 C) 0.50 D) 0.625
Last Answer : D) 0.625
Description : Any number with an exponent of zero is equal to 2) A) itself. B) ten. C) zero. D) one.
Last Answer : D) one.
Description : The decimal equivalent of Binary number 10101 is (A) 21 (B) 31 (C) 26 (D) 28
Last Answer : (A) 21
Description : The 2’s complement of the number 1101110 is (A) 0010001. (B) 0010001. (C) 0010010. (D) None.
Last Answer : Ans: C 1’s complement of 1101110 is = 0010001 Thus 2’s complement of 1101110 is = 0010001 + 1 = 0010010
Description : The information in ROM is stored (A) By the user any number of times. (B) By the manufacturer during fabrication of the device. (C) By the user using ultraviolet light. (D) By the user once and only once.
Last Answer : (B) By the manufacturer during fabrication of the device.
Description : The result of adding hexadecimal number A6 to 3A is (A) DD. (B) E0. (C) F0. (D) EF.
Last Answer : (B) E0.
Description : The number of flip flops contained in IC 7490 is (A) 2. (B) 3. (C) 4. (D) 10.
Last Answer : (A) 2.
Description : In a RAM, information can be stored (A) By the user, number of times. (B) By the user, only once. (C) By the manufacturer, a number of times. (D) By the manufacturer only once.
Last Answer : Ans: A RAM is used by the user, number of times.
Description : The excess 3 code of decimal number 26 is (A) 0100 1001 (B) 01011001 (C) 1000 1001 (D) 01001101
Last Answer : Ans: B (26)10 in BCD is ( 00100110 ) BCD Add 011 to each BCD 01011001 for excess – 3
Description : The decimal equivalent of Binary number 11010 is (A) 26. (B) 36. (C) 16. (D) 23.
Last Answer : (A) 26.
Description : In successive-approximation A/D converter, offset voltage equal to 1/2 LSB is added to the D/A converter's output. This is done to (A) Improve the speed of operation. (B) Reduce the maximum ... Increase the number of bits at the output. (D) Increase the range of input voltage that can be converted
Last Answer : (B) Reduce the maximum quantization error.
Description : The A/D converter whose conversion time is independent of the number of bits is (A) Dual slope (B) Counter type (C) Parallel conversion (D) Successive approximation.
Last Answer : Ans: C The A/D converter whose conversion time is independent of the Number of bits is Parallel conversion. (This type uses an array of comparators connected in parallel and comparators compare the input voltage at a particular ratio of the reference voltage).
Description : The code where all successive numbers differ from their preceding number by single bit is (A) Binary code. (B) BCD. (C) Excess – 3. (D) Gray.
Last Answer : Ans: D The code where all successive numbers differ from their preceding number by single bit is Gray Code. (It is an unweighted code. The most important characteristic of this code is that only a single bit change occurs when going from one code number to next.)
Description : The 2’s complement of the number 1101101 is (A) 0101110 (B) 0111110 (C) 0110010 (D) 0010011
Last Answer : (D) 0010011 Ans: D The 2’s complement of the number 1101101 is 0010011 (1’s complement of the number 1101101 is 0010010 2’s complement of the number 1101101is 0010010 + 1 =0010011)
Description : The Gray code for decimal number 6 is equivalent to (A) 1100 (B) 1001 (C) 0101 (D) 0110
Last Answer : (C) 0101
Description : The hexadecimal number ‘A0’ has the decimal value equivalent to (A) 80 (B) 256 (C) 100 (D) 160
Last Answer : (D) 160
Description : The decimal equivalent of hex number 1A53 is (A) 6793 (B) 6739 (C) 6973 (D) 6379
Last Answer : (B) 6739