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problem 1: What do you mean by the term degaussing?

problem 2: Describe the advantages of the negative modulation.

problem 3: Which material is favored to be used as the camera lens?

problem 4: Compare the salient features or characteristics of Orthicon, Vidicon and Plumbicon camera.

problem 5: Sketch the sectional view of a picture tube which employs electrostatic focusing and electromagnetic deflection and label all electrodes.

problem 6: Describe in brief, how the electron beam is focused on tube screen. What do crossover points in electron gun signify?

problem 7: Which material is favored to be employed as a camera lens?

problem 8: What is the function of Aquadag coating on the inner side of tube well? Why is a grounded coating given on the outer surface of picture tube?

problem 9: Why is aluminized coating given on the phosphor screen? How are any stray ions prevented from hitting screen?

problem 10: Describe the advantages of electromagnetic deflection over the electrostatic deflection in TV picture tubes. Why is cosine winding employed for deflection coils?

Electrical & Electronics, Engineering

• Category:- Electrical & Electronics
• Reference No.:- M97323

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