One Stop GATE Forum: GATE–Sample Questions-Digital Electronics

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   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

Author	Message
aparna Groupie Joined: 30Apr2007 Online Status: Offline Posts: 70	Topic: GATE–Sample Questions-Digital Electronics Posted: 27Nov2007 at 2:27am
	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 20484 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 (34096+15256+516+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 20484 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 Post Resume:* Click here to Upload your Resume & Apply for Jobs

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