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21. A n-stage ripple counter will count up to
2n
2n-1
n
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22. The clock signals are used in sequential logic circuits to
Tell the time of the day
Tell how much time has elapsed since the system was turned on
Carry parallel data signals
Synchronize events in various parts of system
23. 74L5138 chip functions as
Decoder/demultiplexer
Encoder
Multiplexer
Demultiplexer
24. A sequential circuit outputs a ONE when an even number (> 0) of one's are input; otherwise the output is ZERO. The minimum number of states required is
0
1
2
None of these
25. A shift register can be used for
Digital delay line
Serial to parallel conversion
Parallel to serial conversion
All of these
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