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Digital Electronics
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Counters
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Question
The decimal equivalent of the largest number that can be stored in a 4-bit binary counter is ________.
Options
A. 8
B. 15
C. 16
D. 32
Correct Answer
15
Counters problems
Search Results
1. Modulus refers to ________.
Options
A. a method used to fabricate decade counter units
B. the modulus of elasticity, or the ability of a circuit to be stretched from one mode to another
C. an input on a counter that is used to set the counter state, such as UP/DOWN
D. the maximum number of states in a counter sequence
Show Answer
Scratch Pad
Discuss
Correct Answer: the maximum number of states in a counter sequence
2. The circuit shown below is a ________.
Options
A. Johnson counter
B. ring counter
C. decade counter
D. BCD counter
Show Answer
Scratch Pad
Discuss
Correct Answer: Johnson counter
3. In VHDL, if we need to remember a value it must be stored in a ________.
Options
A. function
B. type declaration
C. variable
D. process
Show Answer
Scratch Pad
Discuss
Correct Answer: function
4. The counter circuit and associated waveforms shown below are for a(n) ________ counter, and the correct output waveform for
Q
B
is shown by waveform ________.
Options
A. synchronous, a
B. asynchronous, b
C. synchronous, c
D. asynchronous, d
Show Answer
Scratch Pad
Discuss
Correct Answer: synchronous, c
5. A D flip-flop can be made to toggle by ________.
Options
A. connecting to
Q
to D
B. connecting to Q to D
C. connecting D low
D. connecting D high
Show Answer
Scratch Pad
Discuss
Correct Answer: connecting to
Q
to D
6. A J-K flip-flop is reset and must stay reset after the clock pulse. This transition requires that ________.
Options
A. J and K inputs must both = 0
B. J must be 0, K doesn't matter
C. J doesn't matter, K must = 0
D. J must be 0 and K must be 1
Show Answer
Scratch Pad
Discuss
Correct Answer: J must be 0, K doesn't matter
7. A BCD counter has ________ states.
Options
A. 8
B. 9
C. 10
D. 11
Show Answer
Scratch Pad
Discuss
Correct Answer: 10
8. The duty cycle of the most significant bit from a 4-bit (0?9) BCD counter is ________.
Options
A. 10%
B. 20%
C. 50%
D. 80%
Show Answer
Scratch Pad
Discuss
Correct Answer: 20%
9. The circuit shown below is used for ________, and for the inputs shown, the DATA output will be ________.
Options
A. multiplexing, 1
B. parallel-to-serial conversion, 0
C. demultiplexing, 0
D. parallel-to-serial conversion, HIGH
Show Answer
Scratch Pad
Discuss
Correct Answer: parallel-to-serial conversion, 0
10. In order to check the CLR function of a counter, ________.
Options
A. apply the active level to the
CLR
input and check all of the
Q
outputs to see if they are all in their reset state
B. ground the
CLR
input and check to be sure that all of the
Q
outputs are LOW
C. connect the
CLR
input to
V
cc
and check to see if all of the
Q
outputs are HIGH
D. connect the
CLR
to its correct active level while clocking the counter; check to make sure that all of the
Q
outputs are toggling
Show Answer
Scratch Pad
Discuss
Correct Answer: apply the active level to the
CLR
input and check all of the
Q
outputs to see if they are all in their reset state
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