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Electronics and Communication Engineering - Digital Electronics

Exercise : Digital Electronics - Section 7
16.
A 14 pin AND gate IC has __________ AND gates.
8
6
4
2
Answer: Option
Explanation:

Each AND gates requires 3 pins, 2 inputs and one output, 1 supply pin and 1 ground pin. Hence 4 AND gates.

17.
In 8085 microprocessor, how many lines are there in data bus?
6
8
2
16
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
The basic shift register operations are
serial in - serial out
serial in - parallel out
parallel in - serial out
all of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
The hexadecimal number 'A0' has the decimal value
80
256
100
160
Answer: Option
Explanation:

'Ao' = 10 x 161 + 0 = 160.

20.
A 4 bit ripple counter is in 0000 state. The clock pulses are applied and then removed. The counter reads 0011. The number of clock pulses which have occurred are
3
3 or 19
3 or 19 or 35
none of the above
Answer: Option
Explanation:

After 16 pulses the counter resets. 0011 is 3. Hence clock pulses can be 3 or 3 + 16 or 3 + 16 + 16.

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