Thermionic Emission

1. State the reason why the screen of the cathode ray tube oscilloscope coated with graphite?

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2. Mention the parts of cathode ray oscilloscope?

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3. Mention the 2 types of deflection in an oscilloscope

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4. Which type of current is supplied to the Extra High Tension (EHT) source of the cathode ray oscilloscope?

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5. In the cathode ray tube, which part of it emits electrons by thermionic emission?

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6. Define Thermionic emission

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7. Cathode rays are a stream of fast moving electrons?

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8. Which part of the cathode ray tube attracts electrons?

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9. What causes the electric field between the anodes in a cathode ray oscilloscope?

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10. In a cathode ray oscilloscope which part is used to supply the electrons to be directed towards the screen?

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11. How is vertical deflection achieved in an oscilloscope?

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12. Name what controls the intensity of the cathode ray beam in an oscilloscope

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13. How is horizontal deflection achieved in an oscilloscope?

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14. Which of the following statement is INCORRECT about Cathode rays?

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15. What is produced when cathode rays are suddenly stopped by a metal target?

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16. Why is the tube evacuated in the cathode ray tube?

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17. Explain how a greater degree of focusing of cathode ray beams is achieved in an oscilloscope?

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18. Which of the following is NOT among the uses of a cathode ray oscilloscope?

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19. Mention the properties of cathode rays

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