Exercise: Digital Electronics

Questions for: Digital Electronics

In number system e.g. 6, a “decade” counter has to recycle to 0 at the sixth count. Which of the connections indicate below will realize this resetting? (a logic “0” at the R inputs resets the counters)
A:
B:
C:
D:
None of these
Answer: C
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Assertion (A): Divide-64 counter is a Mod-64 counter and divides the input frequency by 64

Reason (R): A Mod 64 counter can be obtained by cascading Mod 16 and Mod 4 counters.

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R are correct but R is not correct explanation of A
C:
A is true, R is false
D:
A is false, R is true
Answer: B
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The frequency of the driving network connected between pins 1 and 2 of a 8085 chip must be
A:
equal to the desired clock frequency
B:
twice the desired clock frequency
C:
four times the desired clock frequency
D:
eight times the desired clock frequency
Answer: B
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Periodic recharging of the memory cells at regular intervals of 3 to 8 millisecond is required in a
A:
ROM
B:
Static RAM
C:
Dynamic RAM
D:
PLA
Answer: C
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Square root of 4 is
A:
(16)16
B:
(2)2
C:
(8)16
D:
(5)16
Answer: D
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