Classical

Digital Logic - Sequential Circuits

6:   A mod-2 counter followed by a mod-5 counter is
A. Same as a mode-5 counter followed by a mod- 2 counter
B. A decade counter
C. A mod-7 counter
D. Ripple carry Counter
 
 

Option: A

Explanation :

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7:   What is the maximum counting speed of a 4-bit binary counter which is composed of flip-flops with a propagation delay of 25 ns ?
A. 1 MHz
B. 10 MHz
C. 100 MHz
D. 8 MHz
 
 

Option: B

Explanation :

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8:   A JK flip-lop has its J input connected to logic level 1 and its input to the Q output. A clock pulse is fed to its clock input. The flip-lop will now
A. Change its state at each clock pulse
B. Go to state 1 and stay there
C. Go to state 0 and stay there
D. Retain its previous state
 
 

Option: D

Explanation :

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9:   Consider an RS lip-lops with both inputs set to 0. If a momentary '1' is applied at the input S,then the output
A. Q will flip from 0 to 1 and then back to 0
B. Q will flip from 0 to 1 and then back to 0
C. Q will flip from 1 to 0
D. Q will flip from 0 to 1
 
 

Option: D

Explanation :

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10:   The output of a sequential circuit depends on
A. Present inputs only
B. Past outputs only
C. Both present and past inputs
D. Present outputs only
 
 

Option: C

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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.

This Section covers Digital Logic Questions Answers .

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