题目内容

A 3-bit binary counter has a maximum modulus of ().

A. 3
B. 6
C. 8
D. 16

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An asynchronous counter differs from a synchronous counter in ().

A. the number of states in its sequence
B. the method of clocking
C. the type of flip-flops used
D. the value of the modulus

There are at least ()flip-flops for a modulus-12 counter.

A. 12
B. 3
C. 4
D. 5

A retriggerable one-shot with an active HIGH output has a pulse width of 20ms and is triggered from a 60 Hz line. The output will be a ().

A. series of 16.7 ms pulses
B. series of 20 ms pulses
C. constant LOW
D. constant HIGH

Three cascaded modulus-10 counters have an overall modulus of ().

A. 30
B. 100
C. 1000
D. 10,000

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