Exercise: Digital Electronics

Questions for: Digital Electronics

In 8085 microprocessor, how many lines are there in data bus?
A:
6
B:
8
C:
2
D:
16
Answer: B
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A 14 pin AND gate IC has __________ AND gates.
A:
8
B:
6
C:
4
D:
2
Answer: C

Each AND gates requires 3 pins, 2 inputs and one output, 1 supply pin and 1 ground pin. Hence 4 AND gates.

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The initial state of a Mod-16 counter is 0110. After 37 clock pulses the state of counter will be
A:
1011
B:
0110
C:
010
D:
0001
Answer: A

After 37 clock pulses the state will be the same as after (37 - 32), i.e., 5 clock pulses. 6 + 5 = 11. Hence 1011.

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The Boolean expression for the shaded area in the Venn diagram is
A:
X + Y + Z
B:
XY + Z + X YZ
C:
X Y Z + XY
D:
X + Y + Z
Answer: C
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Symmetrical square wave of time period 100 Ξs can be obtained from square wave of time period 10 Ξs by using
A:
divide by 5 circuit
B:
divide by 2 circuit
C:
divide by 5 circuit followed by divide by 2 circuit
D:
BCD counter
Answer: C

Frequency has to be divided by 10.

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