This set of Video Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Reflective Projection Systems”.
1. Which of the following projection system uses small contemplative chip?
a) Reflective
b) CRT
c) LCD Transmissive
d) LED Transmissive
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Explanation: Reflective projection systems uses small reflective chip. When light shines on the chip its image is reflected from the chip and through a lens called projection lens is focused on the screen. The reflective projection system has two types: i) MEMS and ii) LCos
2. What is the full form of MEMS?
a) Multiple-electro Motion System
b) Magnetic-extended Multiple System
c) Micro-electro Mechanical System
d) Multiple-extended Magnetic System
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Explanation: MEMS stands for Micro-electro Mechanical System. On the top of the semiconductor chip, there is a movable or deformable chip reflective surface. As per the digital information, voltage is generated by the chip which changes reflective surface rapidly in a controlled way or manner to produce the image. MEMS is further divided into two groups: i) DMD and ii) GLV
3. In which university of USA was DMD (Digital Micro-mirror Device) developed?
a) John Hopkins
b) Texas
c) Stanford
d) MIT
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Explanation: DMD (Digital Micro-mirror Device)is also called as Digital Light Processing (DLP) and was developed by Texas University of USA. DMD contains a small chip having up to multi-million tiny mirrors depending on the size of array. Each mirror has three physical layers and two air gaps which allows mirror to tilt by +10° or -10°.
4. What is the full form of GLV?
a) Grating Light Valve
b) Graphics Liquid Visual
c) Group Low Valve
d) Graphics Light Variable
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Explanation: GLV states for Grating Light Valve. GLV is a micro projection technology which operates using a dynamically adjustable diffraction grating. It is another MEMS device. It is licensed by Sony. It is a chip consisting of tiny reflective ribbons mounted on a silicon chip. Ribbons are suspended with a small air gap.
5. How long is the vertical line on which the GLV pixels are arranged in a projector?
a) 1080 pixels
b) 720 pixels
c) 360 pixels
d) 420 pixels
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Explanation: In a projector, the GLV (Grating Light Valve) pixels are arranged in a vertical line that is 1080 pixels. Light from the three lasers red, green and blue shine on the GLV and it rapidly forms the image. The main advantage of GLV technology is that GLV chips can make high resolution images at a low cost as compared to DMD(Digital Micro-mirror Device) chips.
6. What is the full form of LCoS?
a) Low Cathode on System
b) Light Crystal on Silicon
c) Liquid Control on System
d) Liquid Crystal on Silicon
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Explanation: LCoS stands for Liquid Crystal on Silicon. LCoS is used for reflective projectors. LCoS can be viewed as a hybrid between the transmissive LCD and reflective DLP technologies, which attempts to combine the best features of both, while eliminating their drawbacks. Thus, it is a reflective technology that uses liquid crystals instead of individual mirrors.
7. LCoS based projectors uses 2 LCoS chips to modulate light.
a) True
b) False
View Answer
Explanation: The above statement is false. LCD projectors use three LCD panels; LCoS based projections uses 3 LCoS chips each one to modulate light in the red, green and blue channels. Both technologies result in the red, green and blue components of light being delivered to the screen simultaneously.
Sanfoundry Global Education & Learning Series – Video Engineering.
To practice all areas of Video Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.
