Electronics and Communication Engineering - Digital Electronics

1.
Octal number 12 is equal to decimal number
8
9
10
11
Answer: Option
Explanation:

12 in octal = 8 + 2, i.e., 10 in decimal.


2.
Hexadecimal number E is equal to binary number
1110
1101
1001
1111
Answer: Option
Explanation:

E = 14 in decimal or 1110 (8 + 4 + 2 + 0 = 14) is binary.


3.
Decimal number 46 in excess 3 code =
1000 1001
0111 1001
0111 1111
1000 1111
Answer: Option
Explanation:

Decimal 46 in excess 3 code = 46 + 33 = 79 in decimal = 0111 1001 in 4 bit binary.


4.
Logic hardware is available only in NAND and NOR.
True
False
Answer: Option
Explanation:

Other gates are also available.


5.
A 4 input AND gate is equivalent to
4 switches in parallel
2 switches in series and 2 in parallel
three switches in parallel and one in series
4 switches in series
Answer: Option
Explanation:

All the switches have to be closed so that the circuit can be made. In AND gate all the inputs have to be high for output to be high.