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
      _____________________________________________________________________________________
 
Top