Exercise: Digital Electronics

Questions for: Digital Electronics

The number of flip flops needed for a Mod 7 counter are
A:
7
B:
5
C:
3
D:
1
Answer: C

23 = 8 If 3 flip-flops are used the modulus can be a maximum of 8.

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Which of the following is not a characteristic of a flip flop?
A:
It is a bistable device
B:
It has two outputs
C:
It has two outputs are complement of each other
D:
It has one input terminal
Answer: D

Flip-flop has more than 1 input.

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If A is 1011, A" is
A:
1011
B:
0100
C:
1100
D:
1010
Answer: A

Taking 2's complement twice gives the original number.

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For the ring oscillator shown in the figure, the propagation delay of each inverter is 100 pico sec. What is the fundamental frequency of the oscillator output __________
A:
10 MHz
B:
100 MHz
C:
1 GHz
D:
2 GHz
Answer: D

T = 500 x 10-12 = 5 x 10-10

= .

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In a 4 input OR gate, the total number of High outputs for the 16 input states are
A:
16
B:
15
C:
14
D:
13
Answer: B

OR gate gives high output when one or more inputs are high.

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