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Wednesday, April 20, 2016

GTU 2131004 Digital Electronics December 2015 Question Paper

GUJARAT TECHNOLOGICAL UNIVERSITY Old / Previous Year Question Paper
BE - SEMESTER–III (New) EXAMINATION – WINTER 2015
Subject Code:2131004 Date:18/12/2015
Subject Name: Digital Electronics
Time: 2:30 pm to 5:00 pm
Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1 Short Questions (14)
1 Convert decimal number (43)10 to binary.
2 Convert octal number (234)8 to hexadecimal.
3 Which gates are also known as controlled NOT gate?
4 Bubbled OR is also called _______________.
5 How many selection lines are required in 32X1 MUX?
6 How many enable lines are there in 3X8 decoder IC 74138?
7 Define fan-out.
8 Which flip-flop is also known as ones-catching flip-flop?
9 Which circuit is used to eliminate chattering?
10 Which latch is also known as transparent latch?
11 Calculate the number of state flip-flops required to generate 49 states?
12 Mention two different methods used to delay the state changes sufficiently.
13 What do you mean by conditional output?
14 What are the advantages of asynchronous state machines?

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