This set of Audio Video Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Stereo Sound System and Projection Television”.
1. Which effect arises due to the difference in length of sound path lines and hence causes time delay with respect to each other?
a) Stereophonic
b) Inductive
c) Mesomeric
d) Electromeric
View Answer
Explanation: Stereophonic effect can be obtained by the use of two microphones at source of sound, one for each of two ears. Stereophonic effect arises due to the difference in length of sound path lines and hence time delay with respect to each other. In general, several microphones may be used in place of one to represent each ear.
2. Which multiplex system is used for the broadcasting of stereo sound?
a) FM-PM
b) AM-AM
c) AM-FM
d) FM-FM
View Answer
Explanation: The broadcasting of the stereo sound is done by FM-FM stereo Multiplex system where only one FM transmitter is used to transmit or broadcast both the left and right channel audio signals. The signal (L + R) is obtained by combining directly the left and right signals while the (L – R) signal is obtained on frequency translation.
3. The IF spectrum consists of a vision carrier, a first IF carrier at 5.5 MHz and a second at 5.7421 MHz from the vision carrier in stereo sound in television.
a) True
b) False
View Answer
Explanation: The above statement is true. It may be noted that the two sound carriers are separated by 15.5 × fH to minimize interference. The value 5.7421 comes from,
5.5 MHz + 15.5 (fH)
= 5.5 MHz + 15.5 (0.015625) MHz
= 5.7421 MHz
4. Which of the following television uses a lens after the picture tube to enlarge the picture?
a) 3D
b) Projection
c) HD
d) Ultra HD
View Answer
Explanation: A projector is used in a projection television to create a small image or a video from a video signal and magnifies this image or video into a viewable screen (projector screen). A bright beam of light and a lens system to project the image to a much larger size is used by the projector.
5. Projection TVs are available in two main configurations called front projection and rear projection.
a) True
b) False
View Answer
Explanation: Projection TVs are available in two main configurations, Front projection and Rear projection. In the front projection television, projector used is separate from the screen and the projector is placed in front of the screen. While in the rear projection television, projector is contained inside the television box and project the image from behind the screen.
6. What is the full form of LCoS?
a) Liquid Crystal on System
b) Liquid Capacitor on Silicon
c) Liquid Crystal on Silicon
d) Length Crystal on Silicon
View Answer
Explanation: The different types of new technologies in the projection television includes: DLP (Digital light processing), LCD projectors, laser TV and LCoS (Liquid Crystal on Silicon). LCoS are capable of 1080p resolution, and examples include Sony’s SXRD (Silicon X-tal reflective display).
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