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Digital Electronics MCQ Questions & Answers | ECE

Learn Digital Electronics MCQ questions & answers are available for a Electronics and Communications Engineering(ECE) students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Digital Electronics MCQ question is the important chapter for a Electronics and Communications Engineering(ECE) and GATE students. Page-4 section-1

Each section contains 100 MCQs on Digital Electronics .
31
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?
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Answer & Solution
Answer: Option D
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32
Excess-3 code is known as
Discuss
Answer & Solution
Answer: Option C
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33
The number 10000 would appear just immediately after
Discuss
Answer & Solution
Answer: Option C
Solution:
Option A: FFFF (hexadecimal)
FFFF in hexadecimal is equal to 65535 in decimal.
Adding 1 gives 65536, which in hexadecimal is written as 10000 (hex).
This does not match 10000 in decimal, hence this option is incorrect.

Option B: 1111 (binary)
1111 in binary is equal to 15 in decimal.
Adding 1 gives 16, which in binary is written as 10000 (binary).
This is not the same as 10000 in decimal, hence this option is incorrect.

Option C: 7777 (octal)
7777 in octal is equal to (7×8³) + (7×8²) + (7×8¹) + (7×8⁰) = 4095 in decimal.
Adding 1 gives 4096, which in octal is written as 10000 (octal).
Thus, 10000 appears immediately after 7777 in the octal number system.

Conclusion:
The correct answer is Option C: 7777 (octal).
34
The only function of NOT gate is to ___________.
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Answer & Solution
Answer: Option B
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35
Which of the following gate is a two-level logic gate
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Answer & Solution
Answer: Option C
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36
When an input signal 1 is applied to a NOT gate, the output is ___________.
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Answer & Solution
Answer: Option A
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37
Storage of 1 KB means the following number of bytes
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Answer & Solution
Answer: Option C
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38
The decimal number 76 in hexadecimal and BCD number system is respectively
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Answer & Solution
Answer: Option D
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39
Which of the following measurements can be done using a counter?
1. Pulse duration
2. Interval between two pulses
3. Amplitude of the pulse
4. Rise time of a pulse
Select the correct answer from the options given below:
Discuss
Answer & Solution
Answer: Option A
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40
Match List-I with List-II and select the correct answer using the options given below the lists:
List-I (Memory elements) List-II (Properties)
a. Semiconductor 1. Destructive memory read out
b. Ferrite core memory 2. Combinational logic
c. Magnetic tape memory 3. Non-volatile
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Answer & Solution
Answer: Option A
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