Electronics and Communication Engineering - Digital Electronics

36. 

7BF16 = __________ 2

A. 0111 1011 1110
B. 0111 1011 1111
C. 0111 1011 0111
D. 0111 1011 0011

Answer: Option B

Explanation:

7BF16 = 7 x 162 + 11 x 161 + 15 x 160 = 1983 in decimal = 0111 1011 1111 in binary.


37. 

For the minterm designation Y = ∑ m (1, 3, 5, 7) the complete expression is

A. Y = A BC + A B C
B. Y = A B C + A B C + ABC + A BC
C. Y = A B C + A B C + ABC + A BC
D. Y = A B C + ABC + A BC + A BC

Answer: Option B

Explanation:

Decimal number 1 = binary number 001 = A BC Decimal number 7 = binary number 111= ABC, Decimal number 3 = binary number 011= ABC Decimal number 5 = binary number 101= ABC . Hence result.


38. 

Zero suppression is not used in actual practice.

A. True
B. False

Answer: Option B

Explanation:

Zero suppression is commonly used.


39. 

A counter type A/D converter contains a 4 bit binary ladder and a counter driven by a 2 MHz clock. Then conversion time

A. 8 μ sec
B. 10 μ sec
C. 2 μ sec
D. 5 μ sec

Answer: Option A

Explanation:


40. 

The hexadecimal number (3E8)16 is equal to decimal number

A. 1000
B. 982
C. 768
D. 323

Answer: Option A

Explanation:

3 x 162 + 14 x 161 + 8 = 1000.