DEM MCQ 2018

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

1. Truth table is used to express :

A) Boolean expression

B) Boolean map

C) Boolean matrix

D) Boolean addition

Answer : A
Explanation : None

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

A) 11001011

B) 11001001

C) 00110101

D) 00110111

Answer : C
Explanation : None

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

A) Rise time

B) Decay time

C) Propagation time

D) Changing time

Answer : C
Explanation : None

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

A) 2

B) 3

C) 4

D) 5

Answer : A
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 ______

A) Control unit a single chip

B) Memory on a single chip

C) Register unit and I/O device on a single chip

D) Register unit and control unit on a single chip

Answer : D
Explanation : None

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

A) A+B

B) A’.B

C)(A+B)’

D) A.B

Answer : D
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 :

A) Of reducing the electronic circuits used

B) To map the given Boolean logic function

C) To minimize the terms in a Boolean expression

D) To maximize the terms of a given boolean expression

Answer : C
Explanation : None

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

A) UV rays

B) Infra red rays

C) By heat radiations

D) None of the above

Answer : A
Explanation : None

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

A) EX-OR gate and NOR gate

B) EX-OR gate and OR gate

C) EX-OR gate and AND gate

D) Four NAND gates

Answer : C
Explanation : None

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

A) 40

B) 27

C) 21

D) 19

Answer : A
Explanation : None

DEM MCQ 2018

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

A) 16-bit stack pointer (SP)

B) 16-bit program counter (PC)

C) Accumulator

D) None of the above

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

12. General purpose registers in a 8085 microprocessor are :

A) B-C, D-E & H-L

B) B-C and H-L

C) A,B-C,H-L

D) None of the above

Answer : A
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 :

A) Divider

B) Integrator

C) Subtractor

D) Differentiator

Answer : B
Explanation : None

14. Which of the following is an universal gate ?

A) NOT

B) AND

C) NOR

D) OR

Answer : C
Explanation : None

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

A) AND Operation

B) OR Operation

C) NOT Operation

D) None of the above

Answer : B
Explanation : None

DEM MCQ 2018

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

A) Arithmetic logic unit

B) Control unit

C) Memory

D) Processor

Answer : A
Explanation : None

17. LEDs are usually switched ON and OFF by :

A) Resistors in the circuit

B) Diode in the circuit

C) Transistor circuit

D) None of the above

Answer : B
Explanation : None

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

A) 8 bit

B) 12 bit

C) 16 bit

D) 32 bit

Answer : C
Explanation : None

19. Flip-flops comes in the category of :

A) Combinational logic circuit

B) Sequential logical circuit

C) Both the combinational as well as the sequential logic circuit

D) None of the above

Answer : B
Explanation : None

20. The solution of (10000-1111) is given by :

A) 1001

B) 0001

C) 1110

D) 0000

Answer : A
Explanation : None

DEM MCQ 2018

DEM MCQ 2018

DEM MCQ 2018

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