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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-8 section-1

Each section contains 100 MCQs on Digital Electronics .
71
Match List-I with List-II and select the correct answer using the options given below the lists:
List-I (Logic Gates) List-II (Power dissipation per gate in mW)
a. DTL 1. 55
b. TTL 2. 10
c. ECL 3. 8
d. MOS 4. 1
5. 40
Discuss
Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
72
How many flip flops are required to construct a MOD-128 counter? What is the largest decimal number that can be stored in a MOD-64 counter?
Discuss
Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
73
(100101)2 is equal to decimal number
Discuss
Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
74
In . . . . . . . ., the flip flop output transition serves as a source for triggering other flip-flops.
Discuss
Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
75
The following circuit represents which logic?
Digital Electronics mcq question image
Discuss
Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
76
A counter is designed with six stages of flip flops. Determine the output frequency at the last (sixth) stage, when input frequency is 1 MHz.
Discuss
Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
77
In an 8-bit D/A converter, the reference voltage used is 10 V. What voltage is represented by 10100001?
Discuss
Answer & Solution
Answer: Option C
Solution:
Here's the explanation:

First, understand what an 8-bit D/A converter does. It converts a digital (binary) number into an analog (voltage) value.

The question gives us the digital input: 10100001 and a reference voltage: 10V.

The reference voltage is the maximum possible output voltage.

An 8-bit converter can represent 28 (which is 256) different voltage levels.

So, each step or increment in the digital value corresponds to a voltage change of Reference Voltage / 256. This is also known as the resolution.

In our case, the resolution is 10V / 256 ≈ 0.0390625V per step.

Next, convert the binary number 10100001 to decimal. 101000012 = (1 * 27) + (0 * 26) + (1 * 25) + (0 * 24) + (0 * 23) + (0 * 22) + (0 * 21) + (1 * 20) = 128 + 32 + 1 = 16110.

Now, to find the output voltage, multiply the decimal value (161) by the voltage per step (0.0390625V):
Output Voltage = 161 * 0.0390625 V ≈ 6.289 V

The closest answer among the options is 6.288 V.

Therefore, the answer is Option C: 6.288 V.
78
Silicon dioxide is used in Ics
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Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
79
Match List-I with List-II and select the correct answer using the options given below the list:
List-I List-II
a. TTL 1. Low power consumption
b. ECL 2. High speed
c. CMOS 3. Low propagation delay
Discuss
Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
80
Which of the following circuit exhibits memory?
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Answer & Solution
Answer: Option B
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