Sequential Circuits Quiz
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Questions and Answers

What defines the state of a sequential circuit at any given time?

  • The stored binary information in storage elements (correct)
  • The feedback from external systems
  • The last outputs only
  • The current inputs only

    • Which of the following statements is true for asynchronous sequential circuits?

  • Events can occur without synchronization. (correct)
  • They always produce stable outputs.
  • Their behavior depends on clock cycles.
  • They require synchronization through clock pulses.

    • What primarily differentiates sequential circuits from combinational circuits?

  • Sequential circuits operate faster than combinational circuits.
  • There are no storage elements in sequential circuits.
  • Sequential circuits have more inputs.
  • They depend on past outputs as well as present inputs. (correct)

    • What is a characteristic of synchronous sequential circuits?

    <p>They use memory elements that are dependent on clock pulses.</p> Signup and view all the answers

    What is a disadvantage of asynchronous sequential circuits?

    <p>They can become unstable without synchronization.</p> Signup and view all the answers

    In a sequential circuit, how is the next state of the storage elements determined?

    <p>By a combination of external inputs and the present state.</p> Signup and view all the answers

    Which of the following is NOT a feature of sequential circuits?

    <p>Immediate output response to input changes.</p> Signup and view all the answers

    What is one disadvantage of a ripple counter compared to a synchronous counter?

    <p>Can cause glitches due to asynchronous behavior</p> Signup and view all the answers

    How does a D-type counter increment its count?

    <p>By connecting the D input to the previous flip-flop's Q output</p> Signup and view all the answers

    What characteristic differentiates a synchronous counter from a ripple counter?

    <p>Synchronous counters are clocked simultaneously</p> Signup and view all the answers

    What is a common application of counters in digital systems?

    <p>Keeping track of time in digital clocks</p> Signup and view all the answers

    Which approach is typically used to ensure a D-type binary counter resets at maximum count?

    <p>Implement a logic circuit that generates a reset signal</p> Signup and view all the answers

    What distinguishes a latch from a flip-flop?

    <p>Latches are level sensitive devices, while flip-flops are edge-sensitive devices.</p> Signup and view all the answers

    What are the states of the outputs Q and Q' in a flip-flop?

    <p>If Q is 1, then Q' is 0.</p> Signup and view all the answers

    Which statement about the system clock in synchronous sequential circuits is correct?

    <p>It generates a periodic train of clock pulses to affect output.</p> Signup and view all the answers

    What is an undefined condition in a flip-flop?

    <p>When Q is set to 0 and Q' is set to 0.</p> Signup and view all the answers

    How does an S-R flip-flop typically maintain its state?

    <p>By retaining the last input state when both inputs are 0.</p> Signup and view all the answers

    In a bistable multivibrator, what happens when a positive signal is applied to the Reset input?

    <p>T2 is turned on and T1 is turned off.</p> Signup and view all the answers

    What is true regarding NAND gates in the context of constructing a flip-flop?

    <p>NAND gates can be used to create both latches and flip-flops.</p> Signup and view all the answers

    Which of the following is NOT a type of flip-flop discussed?

    <p>L Flip-Flop</p> Signup and view all the answers

    What role do inverters play in the fundamental circuit of latches?

    <p>They provide feedback to maintain the state of the circuit.</p> Signup and view all the answers

    What is the output of the flip-flop when both inputs S and R are 0?

    <p>The output remains the same</p> Signup and view all the answers

    What happens when S = 1 and R = 0 in a flip-flop?

    <p>The output sets to 1</p> Signup and view all the answers

    In the condition where both S and R are 1, what occurs in the flip-flop?

    <p>This condition is undefined</p> Signup and view all the answers

    What effect does applying a LOW clock input have on the state of a clocked S-R flip-flop?

    <p>It prevents any change to the state</p> Signup and view all the answers

    What is the result when S = 0 and R = 1 in a flip-flop?

    <p>The output resets to 0</p> Signup and view all the answers

    Which condition requires avoiding simultaneous application of 1s to both inputs in a flip-flop?

    <p>Indeterminate condition</p> Signup and view all the answers

    How does the clock input affect the operation of the basic flip-flop?

    <p>It controls when the state changes occur</p> Signup and view all the answers

    What is the condition for a J-K flip-flop to toggle its state?

    <p>J = 1 and K = 1</p> Signup and view all the answers

    When both inputs of a flip-flop are 0, what happens to the output after a clock pulse is applied?

    <p>The output remains unchanged</p> Signup and view all the answers

    In a flip-flop where R returns to 0 while S remains at 0, what occurs next?

    <p>The state remains unchanged</p> Signup and view all the answers

    Which of the following represents the characteristic equation of a J-K flip-flop?

    <p>Qn+1 = JQ'n + K'Qn</p> Signup and view all the answers

    What is the state of a T flip-flop when T = 0 prior to a clock pulse?

    <p>The flip-flop maintains its present state</p> Signup and view all the answers

    What determines the output state when an indeterminate condition arises in a flip-flop?

    <p>The quickest NOR gate will determine the state</p> Signup and view all the answers

    In which operation does a D-type shift register allow data to be moved?

    <p>Serial manner</p> Signup and view all the answers

    What happens when J = K = 0 in a J-K flip-flop?

    <p>The flip-flop remains in the same state</p> Signup and view all the answers

    Which flip-flop configuration is best for counter design due to its toggling ability?

    <p>T flip-flop</p> Signup and view all the answers

    What does Qn+1 = TQ'n + T'Qn represent in a T flip-flop?

    <p>The characteristic equation of the T flip-flop</p> Signup and view all the answers

    What occurs when K = 1 and J = 0 in a J-K flip-flop?

    <p>The flip-flop resets to 0</p> Signup and view all the answers

    Which type of D-type shift register allows for both serial input and parallel output?

    <p>Serial-in/parallel-out (SIPO)</p> Signup and view all the answers

    Which input conditions cause a J-K flip-flop to remain in the reset state?

    <p>J = 0, K = 1 with Qn = 0</p> Signup and view all the answers

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