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Digital Electioning MCQ Questions and Answers PDF
1.
n which of the following base systems is 123 not a valid number?
Base 10
Base 16
Base8
Base 3
2.
Storage of 1 KB means the following number of bytes
1000
964
1024
1064
3.
What is the octal equivalent of the binary number: 10111101
675
275
572
573.
4.
Pick out the CORRECT statement:
In a positional number system, each symbol represents the same value irrespective of its position
The highest symbol in a position number system as a value equal to the number of symbols in the system
It is not always possible to find the exact binary
Each hexadecimal digit can be represented as a sequence of three binary symbols.
5.
he binary code of (21.125)10 is
10101.001
10100.001
10101.010
10100.111.
6.
NAND gate is called a universal logic element because
it is used by everybody
any logic function can be realized by NAND gates alone
all the minization techniques are applicable for optimum NAND gate realization
many digital computers use NAND gates.
7.
Digital computers are more widely used as compared to analog computers, because they are
less expensive
always more accurate and faster
useful over wider ranges of problem types
easier to maintain.
8.
Most of the digital computers do not have floating point hardware because
floating point hardware is costly
it is slower than software
it is not possible to perform floating point addition by hardware
of no specific reason.
9.
The number 1000 would appear just immediately after
FFFF (hex)
1111 (binary)
7777 (octal)
All of the above.
10.
(1(10101)2 is
(37)10
( 69)10
(41 )10
— (5)10
11.
The number of Boolean functions that can be generated by n variables is equal to
2n
22 n
2n-1
— 2n
12.
Consider the representation of six-bit numbers by two’s complement, one’s complement, or by sign and magnitude: In which representation is there overflow from the addition of the integers 011000 and 011000?
Two’s complement only
Sign and magnitude and one’s complement only
Two’s complement and one’s complement only
All three representations.
13.
A hexadecimal odometer displays F 52 F. The next reading will be
F52E
G52F
F53F
F53O.
14.
Positive logic in a logic circuit is one in which
logic 0 and 1 are represented by 0 and positive voltage respectively
logic 0 and, -1 are represented by negative and positive voltages respectively
logic 0 voltage level is higher than logic 1 voltage level
logic 0 voltage level is lower than logic 1 voltage level.
15.
Which of the following gate is a two-level logic gate
OR gate
NAND gate
EXCLUSIVE OR gate
NOT gate.
16.
Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit ynchronous counter is
TTLAS
CMOS
ECL
TTLLS
17.
An AND gate will function as OR if
all the inputs to the gates are “1”
all the inputs are ‘0’
either of the inputs is “1”
all the inputs and outputs are complemented.
18.
An OR gate has 6 inputs. The number of input words in its truth table are
6
32
64
128
19.
A debouncing circuit is
an astable MV
a bistable MV
a latch
a monostable MV.
20.
NAND. gates are preferred over others because these
have lower fabrication area
can be used to make any gate
consume least electronic power
provide maximum density in a chip.
21.
In case of OR gate, no matter what the number of inputs, a
1 at any input causes the output to be at logic 1
1 at any input causes the output to be at logic 0
0 any input causes the output to be at logic 0
0 at any input causes the output to be at logic 1.
22.
The fan put of a 7400 NAND gate is
2TTL
5TTL
8TTL
10TTL
23.
Assuming 8 bits for data, 1 bit for parity, I start bit and 2 stop bits, the number of characters that 1200 BPS communication line can transmit is
10 CPS
120 CPS
12CPS
None of the above.
24.
Indicate which of the following three binary additions are correct? 1.1011 + 1010 = 10101 II. 1010 + 1101 = 10111 III. 1010 + 1101 = 11111
I and II
II and III
III only
II and III
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