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Electronics and Communication Engineering - Digital Electronics

Exercise : Digital Electronics - Section 1
11.
For the gate in the given figure the output will be
0 
1
A
A
Answer: Option
Explanation:

If A = 0, Y = 1 and A = 1, Y = 0 Therefore Y = A.

12.
In the expression A + BC, the total number of minterms will be
2
3
4
5
Answer: Option
Explanation:

The min terms are ABC + ABC + AB C + ABC + ABC.

13.
The circuit in the given figure is
positive logic XOR gate
negative logic OR gate
negative logic AND gate
positive logic AND gate
Answer: Option
Explanation:

Since V(I) is lower state than V(0) it is a negative logic circuit. Since diodes are in reversed parallel, it is an AND gate.

Note: In Boolean algebra it is recognized that a positive logic OR is a negative logic AND. Similarly a positive logic AND is a negative logic OR.

14.
Which of the following is non-saturating?
TTL
CMOS
ECL
Both (a) and (b)
Answer: Option
Explanation:

Since it is non-saturating, ECL has low propagation delay.

15.
The number of digits in octal system is
8
7
9
10
Answer: Option
Explanation:

The octal system has 8 digits 0 to 7.

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