Electronics and Communication Engineering - Digital Electronics

26. 

The Boolean expression A ⊕ B is equivalent to

A. AB + AB
B. AB + AB
C. B
D. A

Answer: Option B

Explanation:

A ⊕ B = AB + AB


27. 

Which of these are two state devices?

A. Lamp
B. Punched card
C. Magnetic tape
D. All of the above

Answer: Option D

Explanation:

Each has 2 states.


28. 

What will be minimum conversion rate in 6 bit dual slope A/D converter uses a reference of -6v and a 1 MHz clock. It uses a fixed count of 40 (101000).

A. 9000
B. 9259
C. 1000
D. 1000

Answer: Option B

Explanation:

Minimum conversion rate .


29. 

The minimum number of NAND gates required to implement the Boolean function A +AB + ABC is equal to

A. 0
B. 1
C. 4
D. 7

Answer: Option A

Explanation:

A + AB +A B C = A + AB ( 1 + C) = A + AB = A(1 + B) = A.


30. 

For the K map of the given figure, the simplified Boolean expression is

A. A C + A D + ABC
B. A B D + BC
C. A C D + AC
D. A C D + AC + BC

Answer: Option A

Explanation: