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.
A 000 000 1100
B 000 001 1100
C 000 001 1000
D 000 000 1110
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