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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