Important Digital Logic and Design Short Questions
Chapter: 30
Question 1:
How does the frequency counter determine the frequency of an unknown signal?
Answer:
The frequency counter measures the number of clock pulses during a sampling interval and divides the count by the time interval to calculate the frequency of the unknown signal.
Chapter: 30
Question 2:
What is the impact of sampling interval duration on frequency accuracy?
Answer:
Longer sampling intervals provide more accurate frequency measurements. Shorter intervals can result in less precise frequency readings due to fewer counted pulses.
Chapter: 30
Question 3:
How does a cascaded counter circuit improve sampling interval accuracy?
Answer:
A cascaded counter circuit uses a crystal-controlled oscillator to provide accurate timing signals, allowing for precise control of the sampling intervals.
Chapter: 30
Question 4:
Explain the role of the J-K flip-flop in the cascaded counter circuit.
Answer:
The J-K flip-flop in the cascaded counter circuit divides the input signal by 2, providing timing signals for selecting appropriate sampling intervals.
Chapter: 30
Question 5:
What distinguishes a Mealy Machine from a Moore Machine in synchronous state machines?
Answer:
A Mealy Machine's output depends on both the current state and external inputs, while a Moore Machine's output depends only on the current state.
Chapter: 30
Question 6:
How are state variables and excitation inputs used in a sequential circuit?
Answer:
State variables represent the current state of the memory, while excitation inputs are used to change the state on each clock transition, determining the output of the sequential circuit.
Chapter: 31
Question 7:
What does a Next-State Table list in a sequential circuit?
Answer:
A Next-State Table lists each present state of the sequential circuit and the corresponding next state that the circuit switches to on a clock transition.
Chapter: 31
Question 8:
How does a clock transition affect flip-flops in a sequential circuit?
Answer:
A clock transition causes flip-flops to change from their present state to the next state, based on the current flip-flop input combinations.
Chapter: 31
Question 9:
What do the J-K flip-flop inputs determine in the transition table?
Answer:
The J-K flip-flop inputs determine the next state output based on the current state, where specific input combinations set or reset the output.
Chapter: 31
Question 10:
What is a Karnaugh Map used for in sequential circuit design?
Answer:
A Karnaugh Map is used to simplify Boolean expressions for flip-flop inputs by visually grouping terms and minimizing the number of logic gates required.