NIMCET 2013 Previous Year Questions (PYQs) – Page 12 of 12
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All digital circuits can be realized by using only
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Solution
A Multiplexer (MUX) is a universal combinational circuit that can implement any digital logic function, hence all digital circuits can be realized using only multiplexers.
The Boolean function $a+(\overline{a} \,b)$ is equivalent to
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Solution
$a+(\overline{a} \,b)$
=$ (a+\bar{a})(a+b)$
=$1.(a+b)=(a+b)$
Which of the following circuit is used as a memory device in computers?
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Solution
A Flip-Flop circuit is a bistable device capable of storing one bit of data,
making it the basic building block of memory and storage elements in computers.
Convert the Hexadecimal number 4DF to its octal equivalent
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Solution
(4DF)16 = 4×16² + 13×16 + 15 = 124710.
Converting 124710 to octal gives (2337)8.
Converting 124710 to octal gives (2337)8.
A tautology is a Boolean formula that is always true. Which of the following is a tautology?
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Solution
$x+\overline{y}+\overline{x}$
=$\bar{y}+x+\bar{x}$
=$\bar{y}+1$
=$1$
Acronym of EEPROM is
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Solution
EEPROM stands for Electrically Erasable Programmable Read Only Memory, a type of non-volatile memory that can be erased and reprogrammed using electrical signals.
For reproducing sound, a CD audio player uses a
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Solution
A CD audio player uses a laser beam to read digital data encoded on the disc surface, which is then converted into sound.
When we open an internet site, we see www. What does www stand for?
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Solution
WWW stands for World Wide Web, a system of interlinked hypertext documents accessed through the internet.
The answer of the operation $(10111)2 \times (1110)2 in hex equivalent is
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Solution
(10111)2 = 2310,
(1110)2 = 1410,
23 × 14 = 32210 = (142)16.
The minimum number of bits to represent a character from ASCII code set is
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Solution
Answer: 7 bits
Explanation: ASCII has 128 characters (0–127). To represent 128 unique codes, we need 27 = 128 combinations. Hence, 7 bits are sufficient.
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