Digital Electronics Mcqs
This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Digital Electronics ”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Digital Electronics comprehensively.
2. A 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
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3. In which of the following base systems is 123 not a valid number ?
Base 10
Base 16
Base8
Base 3
4. The binary code of (21.125)10 is_______________?
10101.001
10100.001
10101.010
10100.111
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5. 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
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6. 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
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7. (1(10101)2 is_______________?
(37)10
( 69)10
(41 )10
8. What is the octal equivalent of the binary number : 10111101 ?
675
275
572
573
9. The number 1000 would appear just immediately after__________________?
FFFF (hex)
1111 (binary)
7777 (octal)
All of the above
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10. The number of Boolean functions that can be generated by n variables is equal to_________________?
2n
22 n
2n-1
11. 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
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12. Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is__________________?
TTLAS
CMOS
ECL
TTLLS
13. An OR gate has 6 inputs. The number of input words in its truth table are________________?
6
32
64
128
14. 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
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15. 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
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