2015 Autumn Final Exam Answers

1. Describe the general working principle of an amplifier, and give two examples.

2. Why blue skin or hair mammals are extremely rare on earth surface (land).

3. Describe the relation between aperture size and depth of photographs. Draw picture to show how an image form in a pin-hole camera.

4. What are the advantages of using a Number System ?

5. Based on what effect a radio receiver could tune to any right station it listeners choose ?

6. What do communication optics fiber and jewelry diamond have in common ?

7. A radio receiver is not a computer, why does it need some transistors installed ?

8. How does a CCD (Charged Coupled Device) work ?

9. Why the read/write head of a DVD drive always requires laser light source instead of LED or light bulb.

10. Describe in detail the procedure of DVD stamp-pressing production.