Digital Electronics Top 100 Questions With 5 Mock Test

 

Top 100 Important MCQ's With Answer From Digital Electronics BCAC-102

1 . Which of the following options comes under the non - saturated logic family in Digital Electronics?

a)        Emitter - coupled Logic

b)       High-Threshold Logic

c)        Integrated - injection Logic

d)       Diode - Transistor Logic

Click To See AnswerAns: a) Emitter - coupled Logic

2. What is a switching function that has more than one output called in Digital Electronics?

a)      Multi-gate function

b)     Multi-output function

c)      Multiple-gate function

d)     Multiple-output function

Click To See AnswerAns: b) Multi-output function

3. Which characteristic of IC in Digital Circuits represents a function of the switching time of a particular transistor?

a)        Fan - out

b)       Fan - in

c)        Power dissipation

d)       Propagation delay

Click To See AnswerAns: d) Propagation delay

4. When can one logic gate drive many other logic gates in Digital Electronics?

a)        When its output impedance is low and the input impedance is low

b)       When its output impedance is high and the input impedance is high

c)        When its output impedance is high and the input impedance is low

d)       When its output impedance is low and the input impedance is high

Click To See AnswerAns: d) When its output impedance is low and the input impedance is high

5. Which of the following digital logic circuits can be used to add more than 1 bit simultaneously?

a)        Full - adder

b)       Ripple - carry adder

c)        Half - adder

d)       Serial adder

Click To See AnswerAns: b) Ripple - carry adder

6. Which gates in Digital Circuits are required to convert a NOR-based SR latch to an SR flip-flop?

a)        Two 2 input AND gates

b)       Two 3 input AND gates

c)        Two 2 input OR gates

d)       Two 3 input OR gates

Click To See AnswerAns: a) Two 2 input AND gates

7. When does a negative level triggered flipflop in Digital Electronics changes its state?

a)        When the clock is negative

b)       When the clock is positive

c)        When the inputs are all zero

d)       When the inputs are all one

Click To See AnswerAns: a) When the clock is negative

8. Which of the following options represent the synchronous control inputs in an S - R flip flop?

a)      S

b)       R

c)         Clock

d)       Both S and R

Click To See AnswerAns: d) Both S and R

9. What must be used along with synchronous control inputs to trigger a change in the flip flop?

a)      0

b)       1

c)         Clock

d)       Previous output

Click To See AnswerAns: c) Propagation delay

10. Which of the following majorly determines the number of emitters in a TTL digital circuit?

a)        Fan - in

b)       Fan - out

c)        Propagation delay

d)       Noise immunity

Click To See AnswerAns: a) Fan - in

1 1 . What will be the output from a D flip flop if the clock is low and D = 0?

a)      0

b)     1

c)        No change

d)       Toggle between 0 and 1

Click To See AnswerAns: a) No change

12. What are the basic gates in MOS logic family?

a)        NAND and NOR

b)       AND and OR

c)        NAND and OR

d)       AND and NOR

Click To See AnswerAns: a) NAND and NOR

13. How must the output of a gate in a TTL digital circuit act when it is HIGH?

a)        Acts as a voltage source

b)       Acts as a current sink

c)        Acts as a current source

d)       Acts as a voltage sink

Click To See AnswerAns: c) Acts as a current source

14. What is the minimum distance required for single error detection according to Hamming's analysis in Digital Electronics?

a)     1

b)     2

c)     3

d)     4

Click To See AnswerAns: b) 2

15. Which of these error-detecting codes enables to find double errors in Digital Electronic devices?

a)        Parity method

b)       Check sum method

c)        Bit generation method

d)       Odd-Even method

Click To See AnswerAns: b) Check sum method




Mock Test From Digital Electronics [Q.Set-1]

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