Classical

Digital Logic - Sequential Circuits

1:   In a digital counter circuit feedback loop is introduced to
A. Improve distortion
B. Improve stability
C. Reduce the number of input pulses to reset the counter
D. Asynchronous input and output pulses
 
 

Option: C

Explanation :


2:  

Which of the following conditions must be met to avoid race around problem ?

A.

Δ t < tp < T

B.

T > Δt > tp

C.

2 tp < Δt < T

D.

None of these

 
 

Option: B

Explanation :


3:  

 Match List I with List II and select the correct answer form the codes given below the list

           List I                                                                          

A. A shift register can be                
B. A multiplexer                               
C. A decoder can                            
           

List II              
1.for parallel to serial conversion        
2.to generate memory can be used chip select
3.for parallel to serial conversion                                

                                                                            
CODES:
A B C

A.

3 1 2

B.

2 3 1

C.

1 3 2

D.

1 2  3 

 
 

Option: C

Explanation :


4:   With the use of an electronic counter six capsules are to be filled in bottles automatically. In such a counter what will be the number of flip-flops required ?
A. 3
B. 12
C. 6
D. 8
 
 

Option: C

Explanation :


5:   A pulse train can be delayed by a finite number of clock periods using
A. A serial-in serial-out shift register
B. A serial-in parallel-out shift register
C. Both (a) and (b)
D. A parallel-in parallel-out shift register
 
 

Option: D

Explanation :




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Syllabus covered in this section is-

  • Logic functions, Minimization,
  • Design and synthesis of combinational and sequential circuits
  • Number representation and computer arithmetic (fixed and floating point)
  • Propositional (Boolean) Logic
  • Satisfiability and Tautology
  • Logic Families: TTL, ECL and C-MOS gates.
  • Boolean algebra and Minimization of Boolean functions
  • Flip-flops-types, race condition and comparison.
  • Design of combinational and sequential Circuits
  • Representation of Integers: Octal, Hex. Decimal and Binary.
  •  2's complement and 1 's complement arithmetic
  • Floating point representation.

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