Digital Electronics - Electronic Engineering (MCQ) questions & answers

1)   Why are the enable lines specifically used for connecting two or more IC packages in accordance to its application in decoder circuit?

a. It allows the reduction of digital function into similar function with more inputs & outputs
b. It allows the expansion of digital function into similar function with more inputs & outputs
c. It allows the reduction of digital function into different function with more inputs & outputs
d. It allows the expansion of digital function into different function with more inputs & outputs
Answer  Explanation 

ANSWER: It allows the expansion of digital function into similar function with more inputs & outputs

Explanation:
No explanation is available for this question!


2)   The bus-request control input of micro-processor indicates the temporary suspension of current operation by driving all buses into________.

a. high impedance state
b. low impedance state
c. Both a & b
d. None of the above
Answer  Explanation 

ANSWER: high impedance state

Explanation:
No explanation is available for this question!


3)   Which program controllable flipflop is in-built in microprocessor specifically used to set or clear the program instructions?

a. IEN flip-flop
b. IDN flipflop
c. SR flipflop
d. D flipflop
Answer  Explanation 

ANSWER: IEN flip-flop

Explanation:
No explanation is available for this question!


4)   What kind of addressing resemble to direct- addressing mode with an exception of possessing 2- byte instruction along with specification of second byte in terms of 8 low - order bits of memory address?

a. Present- Page Addressing
b. Zero- Page Addressing
c. Relative Addressing
d. None of the above
Answer  Explanation 

ANSWER: Zero- Page Addressing

Explanation:
No explanation is available for this question!


5)   Which parameter/s  is/ are of relevant importance regarding the time interval of memory cycle specified by the microprocessor?

a. Internal clock frequency and access time
b. External clock frequency and access time
c. Internal as well as external clock frequencies
d. Only access time
Answer  Explanation 

ANSWER: Internal clock frequency and access time

Explanation:
No explanation is available for this question!


6)   The boolean functions which can be represented by the sum of minterms and product of maxterms can be categorized in _______.

a. Standard form
b. Canonical form
c. Both a & b
d. None of the above
Answer  Explanation 

ANSWER: Canonical form

Explanation:
No explanation is available for this question!


7)   Which gate must be interposed between the cascaded stages of a parallel binary adder comprising full adders for transmission purpose of carry C11 or C22  to the next stage?

a. OR gate
b. AND gate
c. EX-OR gate
d. NAND gate
Answer  Explanation 

ANSWER: OR gate

Explanation:
No explanation is available for this question!


8)   The push and pop instructions belonging to the category of transfer instructions of microprocessor perform data transformation between _______.

a. two registers
b. processor register and memory stack
c. processor register and interface register
d. interface register and memory word
Answer  Explanation 

ANSWER: processor register and memory stack

Explanation:
No explanation is available for this question!


9)   Which addressing mode execute its instructions within CPU without the necessity of reference memory for operands?

a. Implied Mode
b. Immediate Mode
c. Direct Mode
d. Register Mode
Answer  Explanation 

ANSWER: Register Mode

Explanation:
No explanation is available for this question!


10)   What is/are the directional mode/s of shifting the binary information in a shift register?

a. Up-Down
b. Left-Right
c. Front-Back
d. All of the above
Answer  Explanation 

ANSWER: Left-Right

Explanation:
No explanation is available for this question!


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