Digital Systems Solved MCQs - Part 2

The gray code equivalent of (1011)2 is 1101. 1010. 1110. 1111       _____________________________________________________________________________________
Which of the following decimal numbers has an exact representation in binary notation? 0.1 0.3 0.5 .07       _____________________________________________________________________________________
How many different Boolean functions of degree 4 are there ? 24 28 212 216       _____________________________________________________________________________________
Add the two binary numbers 01101010, 00001000,10000001 and 11111111 10111 111110010 0101 None of Above       _____________________________________________________________________________________
(2FAOC)16 is equivalent to (195 084)10 (001011111010 0000 1100)2 Both (A) and (B) None of these       _____________________________________________________________________________________
Which one of the following is decimal value of a signed binary number 1101010, if it is in 2 complement form ? – 42 -22 – 21 -106       _____________________________________________________________________________________
A B C D       _____________________________________________________________________________________
In order to implement a n variable switching function, a MUX must have 2n inputs 2n+1 inputs 2n-1 inputs 2n-1 inputs       _____________________________________________________________________________________
The smallest integer than can be represented by an 8-bit number in 2’s complement form is -256 -128 -127 0       _____________________________________________________________________________________
If F and G are Boolean functions of degree n. Then, which of the following is true ? A B C D       _____________________________________________________________________________________
A latch is constructed using two cross-coupled AND and OR gates AND gates NAND and NOR gates NAND gates       _____________________________________________________________________________________
The answer of the operation (10111)2*(1110)2 in hex equivalence is 150 241 142 101011110       _____________________________________________________________________________________
Logic gates with a set of input and outputs is arrangement of Combinational circuit Logic circuit Design circuits Register       _____________________________________________________________________________________
How many 1’s are present in the binary representation of 3 × 512 + 7 × 64 + 5 × 8 + 3 8 9 10 11       _____________________________________________________________________________________
The Gray code for decimal number 6 is equivalent to 1100 1001 0101 0110       _____________________________________________________________________________________
Binary number represented by the 0.1 decimal number is 11010.01 1011.11 .00011001 None of Above       _____________________________________________________________________________________
How many flip-flops are required to produce a divide-by-32 device?  2 5 6 4       _____________________________________________________________________________________
Match the following identities/laws to their corresponding name : (a) x + x = x  x . x = x i. Dominance (b) x + 0 = x x . 1 = x  ii. Absorption (c) x + 1 = 1 x . 0 = 0  iii. Idempotent (d) x . (x + y) = x  iv. Identity  a   b    c    d iii    iv    i    ii iv    iii    i    ii iv    iii    ii    i iii    iv    ii    i       _____________________________________________________________________________________
The logic expression for the output of the circuit shown in the figure is A’C’+B’C’+CD AC’+BC’+C’D ABC+C’D’ A’B’+B’C’+C’D’       _____________________________________________________________________________________
The digital logic family which has the lowest propagation delay time is  ECL TTL CMOS PMOS       _____________________________________________________________________________________
12-bit 2’s complement of –73.75 is 01001001.1100 11001001.1100 10110110.0100 10110110.1100       _____________________________________________________________________________________
A binary ripple counter is required to count up to 16383. How many flipflops are required ? 16382 8191 512 14       _____________________________________________________________________________________
What is decimal equivalent of BCD 11011.1100 ? 22.0 22.2 20.2 21.2       _____________________________________________________________________________________
A nonpipeline syatem takes 50 ns process a task. The same task can be processed in a six segment pipeline with a clock cycle of 10ns. Speedup ratio of the pipeline for 100 tasks, is 2.76 3.76 4.76 5.76       _____________________________________________________________________________________
8-bit 1’s complement form of –77.25 is 01001101.0100 01001101.0010 10110010.1011 10110010.1101       _____________________________________________________________________________________
Decimal Number represented by the .11100 binary number is 13.1875 10.625 0.875 0.03125       _____________________________________________________________________________________
The output of a logic gate is 1 when all its inputs are at logic 0. the gate is either A NAND or an XOR An OR or an XNOR An AND or XOR A NOR or an XNOR       _____________________________________________________________________________________
Floating point representation is used to store  Boolean values Whole numbers Real integers Integers       _____________________________________________________________________________________
Perform Subtraction on binary numbers 1011 and 0110 10111 111110010 0101 None of Above       _____________________________________________________________________________________
The primary quality of good working program in the earlier days of software development in the 1950s and 1960s were Maintainable Readable Fast On budget and within time       _____________________________________________________________________________________
The 2’s complement of the number 1101101 is  0101110 0111110 0110010 0010011       _____________________________________________________________________________________
AB+(A+B)’ is equivalent to A?B A+B (A+B)A (A+B)B       _____________________________________________________________________________________
The 2s compliment form (Use 6 bit word) of the number 1010 is 111100 110110 110111 1011       _____________________________________________________________________________________
Page Shift Keying (PSK) Method is used to modulate digital signal at 9600 bps using 16 level. Find the line signals and speed (i.e. modulation rate). 2400 bauds 1200 bauds 4800 bauds 9600 bauds       _____________________________________________________________________________________
The branch logic that provides making capabilities in the control unit is known as Controlled transfer Conditional transfer Unconditional transfer None of the above       _____________________________________________________________________________________
The absorption law in Boolean algebra say that X + X = X X . X = X x + x . y = x None of the above       _____________________________________________________________________________________
Advantage of synchronous sequential circuits over asynchronous ones is faster operation ease of avoiding problems due to hazard lower hardware requirement better noise immunity       _____________________________________________________________________________________
The minimum number of D flip-flops needed to design a mod-258 counter is 8 9 256 512       _____________________________________________________________________________________
A computer with a 32 bit word size uses 2 complement to represent numbers. The range of intergers that can be represented by this computer -232 to 232 -231 to 232 -231 to 231+1 -232 to 231       _____________________________________________________________________________________
In a positive logic system, logic state 1 corresponds to Positive voltage Higher voltage level Zero voltage level Lower voltage level       _____________________________________________________________________________________
Data can be changed from special code to temporal code by using  Shift registers Counters Combinational circuits A/D converters       _____________________________________________________________________________________
Binary number represented by the 255 decimal number is 100101 11111111 1111 101010101       _____________________________________________________________________________________
The highest noise margin is offered by BICMOS TTL ECL CMOS       _____________________________________________________________________________________
The power dissipation of a flip-flop is 3 mW. The power dissipation of a digital system with 4 flip-flops is given by 34 mW 43 mW 4/3 mW 12 mW       _____________________________________________________________________________________
Which logic family dissipates the minimum power ? DTL TTL ECL CMOS       _____________________________________________________________________________________
What is the binary equivalent of the decimal number 368  101110000 110110000 111010000 111100000       _____________________________________________________________________________________
Binary number represented by the 37 decimal number is 100101 11111111 1111 101010101       _____________________________________________________________________________________
Logic X-OR operation of (4ACO)H & (B53F)H results AACB 0000 FFFF ABCD       _____________________________________________________________________________________
What is the transitive voltage for the voltage input of a CMOS operating from 10V supply ? 1V 5V 10V 20V       _____________________________________________________________________________________
Which one of the following set of gates is best suited for parity checking and parity generation ? AND, OR, NOT NAND, NOR EX-OR, EX-NOR None of the above       _____________________________________________________________________________________