THE MAGAZINE FOR COMPUTER APPLICATIONS
Circuit Cellar Online offers articles illustrating creative solutions
and unique applications through complete projects, practical
tutorials, and useful design techniques.

WHAT'S YOUR ENGINEERING QUOTIENT?

Problem 1—Show that a two-input multiplexer (MUX) is a universal gate; i.e., capable of implementing any combinatorial function.

ANSWER

Problem 2—Design a CMOS circuit to realize the following Boolean expression:

(A.B + C.D)'

ANSWER

Problem 3—Give the schematic of a first-order low-pass filter that inverts the siganl and provides gain as well. Use a single OpAmp.

ANSWER

Problem 4—What do you need to know in order to determine the output of the following program?

ANSWER

Problem 5—Give a one-line C expression to convert a float value to the nearest integer.

ANSWER

Problem 6—Give the Boolean expression for the following multiplexer circuit:

ANSWER

Problem 7—I/O functions within many operating systems are divided into the following four layers:

• User-level software
• Device-independent O/S software
• Device drivers
• Interrupt handlers

ANSWER

Problem 8—Assume the following C program:

#include 
int main (void) {
printf ("Hello, World!\n");
}

# hello >out.txt

ANSWER

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