ECET 105 Exam Questions and Answers.

ECET 105 Exam Questions and Answers




NB: ONLY ODD PROBLEMS ANSWERED



SECTION 1–1 Digital and Analog Signals and Systems



1. Name two advantages of digital data as compared to analog data. Advantage

1; A digital audio file has no excess noise. Advantage 2; transfers faster

than analog



3. List three common products that can have either a digital or analog output. 1; A

computer has only digital output.

2; A guitar can have either a digital or analog output. 3; A

printer can have a digital or analog output.



SECTION 1–2 Binary Digits, Logic Levels, and Digital Waveforms



5. Define the sequence of bits (1s and 0s) represented by each of the following sequences of

levels:

(a) HIGH, HIGH, LOW, HIGH, LOW, LOW, LOW, HIGH - 1, 1, 0, 1, 0, 0, 0, 1

(b) LOW, LOW, LOW, HIGH, LOW, HIGH, LOW, HIGH, LOW – 0, 0, 0, 1, 0, 1,

0, 1, 0



7. For the pulse shown in Figure 1–62, graphically determine the following: (a)rise time

, – 0.55μs

(b)fall time – 0.6μs

(c)pulse width – 2.7μs

(d)amplitude – 10v



9. What is the frequency of the waveform in Figure 1–63? 250Hz –

2ms



11. Determine the duty cycle of the waveform in Figure 1–63. 50%



13. What is the total serial transfer time for the eight bits in Figure 1–64? What is the total

parallel transfer time?

Serial: 8μs

Parallel: 1μs



SECTION 1–3 Logic Operations