Electronic Engineering MCQ Question Papers: ENTC, IT Interview Placement

Subject: Digital Electronics 4

**Part 4: List for questions and answers of Digital Electronics**

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**Q1. The design of clocked sequential circuit requires**

**a) The state reduction**

**b) The state assignment**

**c) The design of next state decoder**

**d) All of the above**

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**Q2. In a sequential circuit design, state reduction is done for designing the circuit with**

**a) A minimum no.of flipflops**

**b) A minimum no.of gates**

**c) A minimum no.of gates and memory elements**

**d) None of above**

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**Q3. A sequential circuit with ten states will have**

**a) 10 flipflops**

**b) 5 flipflops**

**c) 4 flipflops**

**d) 0 flipflops**

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**Q4. The output of a clocked sequential circuit is independent of the input.the circuit can be ****represented by**

**a) Melay model**

**b) Moore model**

**c) Either melay or moore model**

**d) Neither melay nor moore model**

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**Q5. For designing a finite state machine K-maps can be used for minimising the**

**a) Excitation expressions of flipflops**

**b) No.of flipflops**

**c) Output logic expressions**

**d) Output logic expressions**

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**Q6. While constructing a state diagram of sequential circuit from set of given statements,**

**a) A minimum no.of states must only be used**

**b) Redundant states may be used**

**c) Redundant states must be avoided**

**d) Redundant states must be avoided **

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**Q7. A finite state machine**

**a) Is same as clocked sequential circuit**

**b) Consists of combinational logic circuits only**

**c) Consists of electrical motors**

**d) Does not exists in practice**

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**Q8. The no.of directed arcs emanating from any state in a state diagram is**

**a) 2n ,where n is no.of inputs**

**b) Independent of no.of inputs**

**c) An arbitrary no**

**d) 2n ,where n is no.of flipflops**

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**Q9. The no.of directed arcs terminating on any state of a state diagram is**

**a) 2n ,where n is no.of inputs**

**b) 2n ,where n is no.of flipflops in the circuits**

**c) Independent of no.of inputs**

**d) Dependent of no.of outputs**

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**Q10. The ___node_________of the state diagram represents the states of the machine**

**a) Node**

**b) Arc**

**c) Vertex**

**d) Transition**

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**Q11. The output values of physical devices are referred to as ___state variables_________.**

**a) State inputs**

**b) State outputs**

**c) State variables**

**d) Next state**

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**Q12. State diagram can also be called the __transition____________diagram.**

**a) State table**

**b) Excitation table**

**c) Transition table**

**d) None of above**

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**Q13. The next state part of the state table is called the __tansition__________table**

**a) State table**

**b) Excitation table**

**c) Transition table**

**d) None of above **

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**Q14. The process of assigning the states of a physical device to the states of a sequential ****machine is known a ___state assignment________.**

**a) State reduction**

**b) State assignment**

**c) State table**

**d) States**

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**Q15. Two states are said to be equivalent if**

**a) If set of inputs generate exactly the same output**

**b) If set of inputs generate exactly the same output and same next state**

**c) If set of inputs generate exactly the same next state**

**d) All above**

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**Q16. How many flip-flops are required for dividing the frequency by 64?**

**a) 4**

**b) 5**

**c) 6**

**d) 8**

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**Q17. The number of flip-flops are required to build a mod-15 counter is ……..**

**a) 4**

**b) 5**

**c) 6**

**d) 7**

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**Q18. A ring counter is same as**

**a) A ring counter is same as**

**b) parallel counter**

**c) shift registers**

**d) none of these**

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**Q19. In sequential circuits, their outputs at any instant of time depends ……..**

**a) Only on the inputs present at that instant of time**

**b) On past output as well as present inputs**

**c) Only on the past inputs**

**d) Only on the past inputs **

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**Q20. A divide by 78 counters can be realized by using …….**

**a) 6 numbers of mod-13 counters**

**b) 13 numbers of mod-6 counters**

**c) One mod-13 counter followed by one mod-6 counter**

**d) 13 numbers of mod-13 counters **

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**Part 4: List for questions and answers of Digital Electronics**

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**Q1. Answer: d**

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**Q2. Answer: a**

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**Q3. Answer: c**

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**Q4. Answer: b**

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**Q5. Answer: a**

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**Q6. Answer: b**

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**Q7. Answer: a**

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**Q8. Answer: a**

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**Q9. Answer: c**

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**Q10. Answer: a**

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**Q11. Answer: c**

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**Q12. Answer: c**

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**Q13. Answer: c**

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**Q14. Answer: b**

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**Q15. Answer: b**

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**Q16. Answer: c**

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**Q17. Answer: a**

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**Q18. Answer: c**

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**Q19. Answer: b**

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**Q20. Answer: b**

**Q17. Answer: c**

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**Q18. Answer: b**

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**Q19. Answer: a**

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**Q20. Answer: a**