ESE EC 2018 Achiever Study Plan: Digital Circuits Quiz 5

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Question 1

For the logic circuit given below, what is the simplified Boolean function?

• AX = AB+C
• BX = BC+A
• CX = AB+AC
• DX = AC+B

Question 2

The black box in the figure shown below consists of a minimum complexity circuit that uses only AND, OR and NOT gates. The function f(x,y,x)=1 whenever x, y are different and 0 otherwise. In addition the 3 inputs x, y, z are never all the same value. Which one of the following equations leads to the correct design for the minimum complexity circuit?

• A
• B
• C
• D

Question 3

A 10-bit A/D converter is used to digitize an analog signal in the 0 to 5 V range. What is the approximate value of the maximum peak to peak ripple voltage that can be allowed in the d.c. supply voltage?

• A100 mV
• B50 mV
• C25 mV
• D5.0 mV

Question 4

Which one of the following is the dual form of the Boolean identity given above?

• A
• B
• C
• D

Question 5

In order to build a 3 bit simultaneous A/D converter, what is the number of comparator circuits required?

• A7
• B8
• C15
• D16

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