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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-3 section-3

Each section contains 100 MCQs on Digital Electronics .
21
A 1-bit full adder takes 20 ns to generate carry-out bit and 40 ns for the sum bit. What is the maximum rate of addition per second when four 1-bit full adders are cascaded?
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Answer & Solution
Answer: Option A
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22
The addition of the two number (1A8)16 + (67B)16 will be:
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Answer & Solution
Answer: Option C
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23
An array multiplier is used to find the product of a 3 bit number with a 4 bit number. How many 4 bits adders are required to perform multiplication?
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Answer: Option B
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24
The given circuit operates as a
Digital Electronics mcq question image
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Answer: Option B
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25
The fan out TTL logic gate is about:
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Answer & Solution
Answer: Option B
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26
In the given figure shows a 4 bit serial in parallel out right shift register. The initial contents as shown are 0110. After 3 clock pulses the contents will be
Digital Electronics mcq question image
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Answer & Solution
Answer: Option C
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27
The Boolean expression $$\left( {\overline {\text{A}} + {\text{B}}} \right)\left( {{\text{A}} + \overline {\text{C}} } \right)\left( {\overline {\text{B}} + \overline {\text{C}} } \right)$$     simplifies to
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Answer: Option C
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28
Decimal 43 in Hexadecimal and BCD number system is respectively
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Answer: Option B
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29
Consider the following statements regarding the Moore and Mealy models:
1. In the Mealy circuit, the final output depends only on the present state of memory elements.
2. In the Moore circuit, output can change in between the clock edges if the external inputs change.
3. The implementation of a logic function in Mealy circuit needs more number of states than Moore circuit.
Which of the above statements are not correct?
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Answer & Solution
Answer: Option C
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30
Which circuit is having both programmable gates
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Answer & Solution
Answer: Option B
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