 A directory of Objective Type Questions covering all the Computer Science subjects. Here you can access and discuss Multiple choice questions and answers for various compitative exams and interviews.

 231. A digitized voice channel is made by digitizing a 4-kHz bandwidth analog voice signal. We need to sample the signal at twice the highest frequency (two samples per hertz). We assume that each sample requires 8 bits. What is the required bit rate? a. 64 kbps b. 32 kbps c. 128 kbps d. 16 kbps

 232. What is the bit rate for high-definition TV (HDTV)? a. 1.4 Gbps b. 2 Gbps c. 1.5 Gbps d. 1.8 Gbps

 233. A device is sending out data at the rate of 1000 bps. How long does it take to send a file of 100,000 characters? a. 200s b. 400s c. 600s d. 800s

 234. A file contains 2 million bytes. How long does it take to download this file using a 56-Kbps channel? a. 1-2 mins b. 5-6 mins c. 2-4 mins d. 7-8 mins

 235. We need to send 265 kbps over a noiseless channel with a bandwidth of 20 kHz. How many signal levels do we need? a. 1024 b. 512 c. 256 d. 128

 236. Calculate the theoretical highest bit rate of a regular telephone line. The signal-to-noise ratio is usually 3162. a. 34.860 kbps b. 17.40 kbps c. 11.62 kbps d. none of the Mentioned