31. A periodic signal can always be decomposed into ________.

a. Exactly an odd number of sine waves

b. A set of sine waves, one of which must have a phase of 0°

c. A set of sine waves

d. None of the above

**c. A set of sine waves**

**32. A periodic signal completes one cycle in 0.001 s. What is the frequency?**

a. 1 Hz

b. 100 Hz

c. 1 KHz

d. 1 MHz

**c. 1 KHz**

**33. In a frequency-domain plot, the horizontal axis measures the ________.**

a. Frequency

b. Peak amplitude

c. Phase

d. Slope

**a. Frequency**

**34. In a time-domain plot, the vertical axis is a measure of ________.**

a. Frequency

b. Phase

c. Amplitude

d. Time

**c. Amplitude**

35. If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what is the highest frequency?

a. 5 KHz

b. 10 KHz

c. 47 KHz

d. 57 KHz

**d. 57 KHz**

**36. What is the bandwidth of a signal that ranges from 40 KHz to 4 MHz?
**a. 3.96 MHz

b. 36 MHz

c. 360 KHz

d. 396 KHz

**a. 3.96 MHz**

**37. As frequency increases, the period ________.**

a. Decreases

b. Increases

c. Remains the same

d. Doubles

**a. Decreases**

**38. When propagation speed is multiplied by propagation time, we get the ________.**

a. Throughput

b. Wavelength of the signal

c. Distance a signal or bit has traveled

d. Distortion factor

**c. Distance a signal or bit has traveled**

**39. Propagation time is ________ proportional to distance and ________ proportional to propagation speed.**

a. Inversely; directly

b. Inversely; inversely

c. Directly; inversely

d. Directly; directly

**c. Directly; inversely**

**40. Wavelength is ________ proportional to propagation speed and ________ proportional to period.**

a. Directly; directly

b. Inversely; directly

c. Directly; inversely

d. Inversely; inversely

**a. Directly; directly**