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Electronics and Communication Engineering - Digital Electronics

Exercise : Digital Electronics - Section 4
11.
BCD number 1100111 = __________ 10
66
67
68
69
Answer: Option
Explanation:

0110 = 6 and 0111 = 7 Hence 67.

12.
The K-map for a Boolean function is shown in figure. The number of essential prime implicants for this function is
4
5
6
8
Answer: Option
Explanation:

Essential Prime implicates = 4.

13.
When microprocessor processes both positive and negative numbers, the representation used is
l's complement
2's complement
signed binary
any of the above
Answer: Option
Explanation:

2's complement representation requires simple electronic circuitry.

14.
An AND gate has four inputs. One of the inputs is low and other inputs are high. The output
is low
is high
is alternately low and high
may be high or low depending on relative magnitudes of inputs
Answer: Option
Explanation:

In AND gate all inputs must be high to give high output.

15.
In the given figure, the flip flop is
negative edge triggered
positive edge triggered
level triggered
either (a) or (c)
Answer: Option
Explanation:

The small circle indicates negative and small triangle indicates edge triggering.

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