Instructions:
(a)4 marks will be allotted for correct question and 1 will be
deducted for incorrect question. (b)More than
one answer can be correct.
Que.
1
in serial communication employing 8 data bits,a parity bit and 2 stop
bits, the minimum band rate required to sustain a transfer rate of 300
charecters per secound is
A
2400 band
B
19200 band
C
3300 band
D
1200 band
Que.
2
the ASCII code is for inforation interchange by a binary code for
A
numbers only
B
alphabets only
C
alpha numerics and other common
D
none of these
Que.
3
Traffic light on road are example of
A
close loop system
B
open loop system
C
both open loop and close loop
D
open loop but can be made close loop
Que.
4
how many address lines are needed to address each memory location in a
2048*4 memory chip?
A
10
B
11
C
8
D
12
Que.
5
which code is used in Baudot system?
A
five unit
B
seven unit
C
morse
D
ASCII
Que.
6
the advantage of the self correcting code is
A
it is a weighted code
B
it has even parity
C
it is easy to decode electronically
D
all of these
Que.
7
The number -34 is represented in Excess-3 BCD code is
A
1,1001 1000
B
0,1001 1001
C
1,0110 0011
D
0,0110 0111
Que.
8
which of the following is not a charecteristic of rise processor design?
A
one instruction per cycle
B
registor to registor operations only
C
simple address modes
D
registor to memory operations only
Que.
9
The octal representation of an integer is (342)8 if this were to be treated
as an eight bit integer in an 8085 based computer its decimal equivalent is
A
226
B
-98
C
76
D
-30
Que.
10
A storage medium with cannot support both direct access and sequential
access application is
A
magnetic drup
B
hard disk
C
magnetic tape
D
floopy drive
Que.
11
The majour disadvantage of magnetic tapes is
A
cost
B
unreliability of stored data
C
slow data recording
D
data is to be accessed sequentially
Que.
12
In time division multiplexing
A
time is doubled betwen bits and byte
B
time slicing at CPU level takes place
C
total time available in the channel is divided between several
users and each users is alloted a time slice
D
none of these
Que.
13
The number of full and half-adders required to add 16-bit numbers
is
A
8 half-adders, 8 full-adders
B
1 half-adder, 15 full-adders
C
16 half-adders, 0 full-adders
D
4 half-adders, 12 full-adders
Que.
14
The simultaneous equations on the Boolean variables x, y, z and w, x+y+z=l
xy =0 xz+w = l x+[(complement)z w] =0 have the following solution
for x, y, z and w, respectively.
A
0 1 0 0
B
1 1 0 1
C
1 0 1 1
D
1 0 0 0
Que.
15
The 2's complement representation of (-539) 10 in hexadecimal is
A
ABE
(BDBC
B
wx'y'+xy+xz
C
DE5
D
9E7
Que.
16
How many gates are needed for 3-bit up counter using standard binary and
using T flip-flop?Assume unlimited fan-in
A
4
B
3
C
2
D
1
Que.
17
A boolean function x'y'+xy+x'y is equivalent to
A
x'+y'
B
x+y
C
x+y'
D
x'+y
Que.
18
In an SR latch by crossing coupling two NAND gates if both S and R inputs
are set to 0 then it will result in
A
Q=0, Q'=1
B
Q=1, Q'=0
C
Q=1, Q'=1
D
indeterminate state
Que.
19
In 2's complement addition overflow
A
is flagged whenever there is carry from sign bit addition
B
cannot occur when positive values added to the negative value
C
is flagged whenever there is carry from sign bit solution
D
none of the above
Que.
20
the minimum number of NAND gates required to implement the boolean function
A+AB+ABC=
A
0
B
1
C
4
D
7
Que.
21
an R-S latch is a
A
combinatorial ckt
B
synchronous sequential ckt
C
1-bit memory arrangement
D
one clock delay element
Que.
22
Ques 25. in an 8085 microprocessor system the RST instruction will cause
an interrupt
A
only if an interrupt service routine is not being executed
B
only if a bit in the intreeupt mask is made 0
C
only if interrupts have been enabled by an EI INSTRUCTION
D
NONE OF THE ABOVE
Que.
23
the minimum number of two input NAND gate required to iomplement the boolean
function _ Z=ABC,ASSUME that A,Band C are available is
A
2
B
3
C
5
D
6
Que.
24
The threshold level for logic 1 in the TTL family is
A
only voltage above 2.5V
B
any voltage between 0.8V and 5.0V
C
any voltage below 5.0V
D
any voltage below V(cc) but above 2.8V
Que.
25
the binary fraction 0.0111 in decimal form is equal to
A
0.4375
B
0.6225
C
0.8325
D
0.1105
Que.
26
in order to add 1111+1101, we required
A
one FA,one HA
B
three FA
C
three FA,one HA
D
none of these
Que.
27
A system has a word length of 4-bits.If in this system -ve numbers are
represented by their Two's compliment,then the range of numbers that can
be represented by the word length is
A
-8 to +8
B
-7 to +7
C
-16 to +16
D
none of these
Que.
28
The decimal value 0.25
A
is equivalent to binary value 0.1
B
is equivalent to the binary value 0.01
C
is equivalent to the binary value 0.00111
D
cannot be represented precisely in binary
Que.
29
How many boolean functions of 3 variables are there?
A
16
B
64
C
256
D
512
Que.
30
The number of 1s in the binary representation of (3*4096+15*256+5*16+3)
are
A
8
B
9
C
10
D
12
Que.
31
The threshold level for logic 1 in the TTL family is
A
any voltage above 2.5v
B
any voltage between 0.8v and 5.0v
C
any voltage below 5.0v
D
any voltage below V(cc) but above 2.8v
Que.
32
In order to add 1111+1101, we required
A
one FA,one HA
B
three FA
C
three FA,one HA
D
none of these
Que.
33
The number of different boolean function of 4 variables are
A
2^16
B
16^2
C
4^2
D
16^4
Que.
34
A carry look ahead adder is frequently used for addition because, it
A
is faster
B
more accurate
C
used fewer gates
D
costs less
Que.
35
The 2's complement representation of the decimal value 15 is
A
1111
B
11111
C
111111
D
10001
Que.
36
Sign extension is a step in
A
Floating point multiplication
B
Signed 16 bit integer addition
C
Arithmetic left shift
D
Converting a signed integer from one size to another.
Que.
37
Zero has two representation in
A
sign magnitude
B
1's complement
C
2's complement
D
none of the above
Que.
38
how many address lines are needed to address each memory location in a
2048*4 memory chip?
A
10
B
11
C
8
D
12
Que.
39
which code is used in Baudot system?
A
five unit
B
seven unit
C
morse
D
ASCII
Que.
40
If a counter having 10FFs is initally at 0,what count will if hold after
2060 pulses.
