# DEM MCQ 2018

Digital Electronics & Microprocessor (DEM MCQ) Multiple Choice Questions and Answers

1. Truth table is used to express :

Explanation : None

2. 1’s complement of 11001010 is given by :

Explanation : None

3. The time required for a gate or inverter to change its state is called :

Explanation : None

4. The minimum number of transistors can be used by 2 input AND gate is __________

Explanation : In AND gate minimum number of transistors can be used by 2 input and maximum number of transistors up to 3 imput.

5. A microprocessor is ALU and ______

Explanation : None

##### DEM MCQ 2018

6. The Boolean expression A’B+AB’+AB is equivalent to :

Explanation : A’B+AB’+AB = A’B+A(B’+B) = A’B+AB {Formula,X+X’=X} = B(A’+A) = BA

7. K-map is used for the purpose :

Explanation : None

8. EPROM contents can be erased by exposing it to :

Explanation : None

9. The gates required to build a half adder are :

Explanation : None

10. The number of output pins of a 8085 microprocessor are :

Explanation : None

##### DEM MCQ 2018

11. Which one of the following is 8-bit register in microprocessor :

Explanation : The registers, PSW, TCON and Accumulator are 8-bit registers.

12. General purpose registers in a 8085 microprocessor are :

Explanation : General Purpose register pairs – BC, DE, and HL, to perform some 16-bit operation.

13. The use of OP-AMP is generally not preferred as :

Explanation : None

14. Which of the following is an universal gate ?

Explanation : None

15. In Boolean Algebra the plus sign (+) indicates :

Explanation : None

##### DEM MCQ 2018

16. The unit that performs the arithmetic and logical operation on the stored number is known as :

Explanation : None

17. LEDs are usually switched ON and OFF by :

Explanation : None

18. A stack pointer is ______ bit register in 8085 microprocessor

Explanation : None

19. Flip-flops comes in the category of :