Electronics and Communication Engineering - Electronic Devices and Circuits

26.
The Boolean expression A ⊕ B is equivalent to
AB + AB
AB + AB
B
A
Answer: Option
Explanation:

A ⊕ B = AB + AB


27.
Which of these are two state devices?
Lamp
Punched card
Magnetic tape
All of the above
Answer: Option
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).
9000
9259
1000
1000
Answer: Option
Explanation:

Minimum conversion rate .


29.
The minimum number of NAND gates required to implement the Boolean function A +AB + ABC is equal to
0
1
4
7
Answer: Option
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 C + A D + ABC
A B D + BC
A C D + AC
A C D + AC + BC
Answer: Option
Explanation: