This set of Video Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Comparison and Choice of Rear Projection Receivers”.
1. Which of the following is the advantage of CRT projector?
a) Long life
b) Bulky, heavy
c) Focusing problem
d) Screen resolution
View Answer
Explanation: The advantages of CRT are: i) CRTs have very long life ii) It achieves excellent color resolution iii) It is less expensive. The disadvantages of CRT are: i) It is bulky, large and heavy depth wise ii) It has focusing problems iii) It has geometric destination and screen resolution problem.
2. A lamp transmits light through a small LCD chip made up of individual pixels to create an image in LED rear projection TV.
a) True
b) False
View Answer
Explanation: The above statement is false. After receiving light from a lamp through a small LCD chip made up of individual pixels, the LCD uses mirrors to take the light and create three separate beams of red, green and blue which are then passed through three separate LCD panels. This is how an image is created in a LCD rear projection TV.
3. Which of the following projector creates an image using a digital micro-mirror device (DMD) in a rear projection TV?
a) Front
b) LCD rear
c) Reflective
d) DLP
View Answer
Explanation: A DLP (Digital Light Processing) projector creates an image using a digital micro-mirror device (DMD chip), which on its surface contains a large matrix of microscopic mirrors, each corresponding to one pixel in an image. Each mirror can be rotated to reflect light such that the pixel appears bright, or the mirror can be rotated to direct light elsewhere and make the pixel appear dark.
4. Color is added to the image-creation process either through a spinning color wheel or a 3-chip projector in DLP (Digital Light Processing) rear projection TV.
a) True
b) False
View Answer
Explanation: In DLP rear projection TV color is added to the image creation process either through a three chip projector(red, green and blue) or a spinning color wheel (used with a single chip projector). The color wheel is placed between lamp light source and the DMD (Digital micro-mirror device) chip such that the light passing through is colored and then reflected off a mirror to determine the level of Darkness.
5. What is the RPM at which the four segment color wheel rotates in a single chip DLP projector?
a) 2200
b) 4500
c) 3600
d) 5250
View Answer
Explanation: DLP (Digital Light Processing) rear projector TV suffer from an effect called the rainbow effect. It is found only in single chip DLP projectors and was particularly widespread with the first generation of DLP projectors which used a 4 segment color wheel comprising of red, green, blue and usually a clear segment rotating at 3600 RPM (Revolutions per Minute).
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