Exercise: Digital Electronics

Questions for: Digital Electronics

Which of the following characteristic are necessary for a sequential circuit?
  1. It must have 6 gates
  2. It must have feedback
  3. Its output should depend on past value
Which of the above statements are correct?
A:
1, 2, 3
B:
1, 2
C:
2, 3
D:
1, 3
Answer: C

The number of gates may be any.

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A 4 bit DAC gives an output of 4.5 V for input of 1001. If input is 0110, the output is
A:
1.5 V
B:
2.0 V
C:
3.0 V
D:
4.5 V
Answer: C

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For a Mod-64 synchronous counter the number of flip flops and AND gates needed is
A:
6 and 4 respectively
B:
4 and 6 respectively
C:
7 and 5 respectively
D:
5 and 7 respectively
Answer: A

26 = 64 Hence 6 flip-flops. The number of AND gates is 6 - 2 = 4 see in the given figure

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The minimum number of comparators required to build an 8 bit flash ADC is
A:
8
B:
63
C:
255
D:
256
Answer: C

2n - 1 = 28 - 1 = 255.

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In a 7 segment display the segments a, c, d, f, g are lit. The decimal number displayed will be
A:
9
B:
5
C:
4
D:
2
Answer: B

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