This set of Audio Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Blue Ray Technology and High Fidelity Systems”.
1. Gramophone disc (LP) is a high capacity digital optical disc which is used for data storage.
a) True
b) False
View Answer
Explanation: The above statement is false. Blu-ray disc is a high capacity digital optical disc which is used for data storage. It was designed to replace our traditional CDs and DVDs. Blu-ray disc is capable of storing HD (720p) and UHD (2160p) resolution videos which are very large in size.
2. Up to how many GB the disc storage is expanded per layer in Blu-ray technology?
a) 10
b) 15
c) 5
d) 25
View Answer
Explanation: The diameter of a Blu-ray disc is 120 mm and 1.2 mm thick. It is available upto 4 layers (single, double, triple and quad). Disc storage is expanded up to 25 GB per layer. Dual-layer discs have storage of 250 GB storage capacity. Triple and quad layer disc comes with 100 GB and 128 GB storage capacity.
3. Which video quality is the Blu-ray disc capable of storing?
a) 1K
b) 2K
c) 3K
d) 4K
View Answer
Explanation: Blu-ray disc are capable of storing 4K (UHD, 2160p) video quality. In DVD we use 650 nm red laser diode, but in Blu-ray technology we use 405 nm BLUE laser diode, so due to blue laser technology it is called Blu-ray discs and all type of recording is done on the laser diode.
4. What can be downloaded instantly from the internet with the help of Blu-ray disc?
a) Audio
b) Video
c) Subtitles
d) Both audio and video
View Answer
Explanation: Blu-ray discs not only have storage capacity than traditional DVDs, but they also offer a new level of interactivity. Users will be able to connect to the internet and instantly download subtitles and other interactive movie features.
5. The more data that is contained on a disc, the smaller and more closely packed the pits must be.
a) True
b) False
View Answer
Explanation: Discs store digitally encoded video and audio information in pits-spiral grooves that run from the center of the disc to its edges. A laser reads the other side of these pits-the-bumps to play the movie or program that is stored on the DVD. The more data that is contained on a disc, the smaller and more closely packed to the pits must be.
6. What is the data transfer rate in Blu-ray discs?
a) 36 Mbps
b) 56 Mbps
c) 78 Mbps
d) 63 Mbps
View Answer
Explanation: As Blu-Ray disc can record high-definition television (HDTV) without any quality loss. Blu-Ray also has a higher data transfer rate of 36 Mbps (megabytes per second) than today’s DVDs, which transfer at 10 Mbps. A Blu-ray disc can record 25 GB of material in just over an hour and a half.
7. What can be termed as falsified reproduction of an audio signal caused by change in the waveform of the original signal?
a) Distortion
b) Frequency
c) Amplitude
d) Phase
View Answer
Explanation: The important elements in a Hi-fi system are a wide, flat frequency response and inaudible distortion. Distortion is termed as falsified reproduction of an audio signal caused by change in the waveform of the original signal. Ideally, we would like to have a frequency response from 20-20,000 Hz and less than 0.5 % total distortion in our Hi-fi system when measured in an anechoic chamber.
8. By using which technology home stereo system remains the best way to listen to recorded music?
a) Low fidelity
b) High fidelity
c) Blu-ray disc
d) DVDs
View Answer
Explanation: Movie sound might be anything, such as waves rolling onto a beach, wind in the trees, traffic sounds, city noise, police sirens etc. in the real world such noise can come from any and all directions. However, this bears scant resemblance to a normal concert experience, which is why a high fidelity, home stereo system remains the best way to listen to recorded music.
9. At which frequency response can one be proud of listening to a Hi-fi music system?
a) 30-15,000 Hz
b) 120-15,000 Hz
c) 90-15,000 Hz
d) 30-50,000 Hz
View Answer
Explanation: The weak link in most home music systems is the loudspeakers. Very few loudspeakers can meet those specifications. If one can achieve a usable frequency response of 30-15,000 Hz at one’s listening position in home without intrusive distortion, we can say he/she has a Hi-fi system to be proud of.
10. Which type of sound is produced in a closed room?
a) Direct, reflected and reverberant
b) Direct, refracted and reverberation
c) Indirect, refracted and reverberant
d) Indirect and reverberant
View Answer
Explanation: At home, a two channel stereo system in the front of the listening room also produces direct, reflected and reverberant sound. Sound from the Hi-Fi systems loudspeakers goes directly to the listener ears, but sound waves also bounce off the side and back walls of the room. Thus, a good listening room is analogous, on a much smaller scale to an indoor concert experience.
Sanfoundry Global Education & Learning Series – Audio Engineering.
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