ECET 299 Digital Circuits PRACTICE1

Question : (TCO 3) In the decimal number 481, what is the powers-of-ten weight of the digit 4? Student Answer: 400 (Although the value is 400, the weight is 100, because the value is four times the weight (4 * 100).) 100 (In a decimal number, the left digit has weight of 10 to the power 0 (=1), the next digit has weight of 10 to the power 1 (=10), and the third digit has weight of 10 to the power 2 (=100).) 10 (The second place has weight of 10 to the power 1 or 10. The question is asking for the weight of the third place, which is 10 to the power 2, or 100.) 4 (This is the value of the third digit that must be multiplied by the weight to give the actual number represented.) Instructor Explanation: In any number system, the value of a position is equal to the place multiplied by the number base raised to the power of the place. In other words, the left­most position is the base raised to the power of 0, the next place to the right is the base raised to the power of 1, the next place to the right is the base raised to the power of 2, and so on. See Dueck, Chapter 1.3. Points Received: 0 of 1 Comments: 2. Question : (TCO 3) What is the duty cycle of a periodic signal that is high for 10 microseconds and low for 90 microseconds?