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Electronics and Communication Engineering - Digital Electronics

Exercise : Digital Electronics - Section 7
11.
If an analog voltage is expressed in binary using 4 bits, each successive binary count would represent
of total voltage
of total voltage
of total voltage
of total voltage
Answer: Option
Explanation:

Since 1111= decimal 15, each successive binary count represent 1/15 of total voltage.

12.
In a 4 input AND gate, the total number of High outputs for 16 input states are
16
8
4
1
Answer: Option
Explanation:

In only one combination are all inputs high.

13.
Symmetrical square wave of time period 100 μs can be obtained from square wave of time period 10 μs by using
divide by 5 circuit
divide by 2 circuit
divide by 5 circuit followed by divide by 2 circuit
BCD counter
Answer: Option
Explanation:

Frequency has to be divided by 10.

14.
The Boolean expression for the shaded area in the Venn diagram is
X + Y + Z
XY + Z + X YZ
X Y Z + XY
X + Y + Z
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
The initial state of a Mod-16 counter is 0110. After 37 clock pulses the state of counter will be
1011
0110
010
0001
Answer: Option
Explanation:

After 37 clock pulses the state will be the same as after (37 - 32), i.e., 5 clock pulses. 6 + 5 = 11. Hence 1011.

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