Electronics and Communication Engineering - Digital Electronics

1. 

Octal number 12 is equal to decimal number

A. 8
B. 9
C. 10
D. 11

Answer: Option C

Explanation:

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


2. 

Hexadecimal number E is equal to binary number

A. 1110
B. 1101
C. 1001
D. 1111

Answer: Option A

Explanation:

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


3. 

Decimal number 46 in excess 3 code =

A. 1000 1001
B. 0111 1001
C. 0111 1111
D. 1000 1111

Answer: Option B

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.

A. True
B. False

Answer: Option B

Explanation:

Other gates are also available.


5. 

A 4 input AND gate is equivalent to

A. 4 switches in parallel
B. 2 switches in series and 2 in parallel
C. three switches in parallel and one in series
D. 4 switches in series

Answer: Option D

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.


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