1. Answer the following questions:

1.1 A signal has 100 possible levels. This signal is a. analog b. digital c. neither d. cannot be determined 1.2 A digital signal must have exactly two levels, high and low. a. true b. false 1.3 Sampling is measuring the amplitude of an analog signal _____________ a at regular intervals b. when it changes c. at random intervals 1.4 Taking too few samples while sampling may lead to a. too few bits in the quantization b. using too much bandwidth for PCM c. incorrectly reproducing the data d. a parity error 1.5 Which technique converts digital data to a digital signal? a. Line coding b. Shannons theorem c. Pulse Code Modulation 1.6 Why is line coding used to send digital signals? a. Line coding uses sine waves, which exist in nature b. Line coding uses less bandwidth than sending the digital data directly c. Line coding creates a perfect channel d. Line coding make synchronization between sender and receiver easier 1.7 Channel capacity is a. the theoretical upper limit on how many bits/sec can pass through a link b. the number of samples/sec required for PCM c. the analog bandwidth d. the maximum baud rate of a link 1.8 Nyquists theorem for channel capacity assumes a perfect channel. a. True b. False 1.9 A channel can have infinitely large channel capacity. a. True b. False 1.10 Log2(64) is a. 64 b. 6 c. 5 d. cannot be determined