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MCQs in Vacuum Tubes Part I – Answers

(Last Updated On: December 8, 2017)

Answers in   Vacuum Tubes - MCQs Part I

Below are the answers key for the Multiple Choice Questions in Vacuum Tubes – MCQs Part 1.

1. Plate and cathode

2. decreases

3. a rectifier

4. Triode valve

5. positive

6. no appreciable change in plate current

7. a rectifier

8. Pentode

9. very high

10. secondary emission

11. Tungsten

12. increases several million times

13. 10000 hours

14. much more than

15. SCR

16. pentode

17. negative voltage applied to plate with respect to cathode

18. Eb/Ib

19. zero with respect to cathode

20. ∆Eb/∆Ec

21. Pentode valve

22. negative

23. loses all control

24. plate

25. 1000 Ω

26. very low frequency

27. unidirectional

28. small

29. no gas in the envelope

30. Class C

31. 30 %

32. 5 times

33. somewhat lower than

34. Transformer coupling

35. space charge

36.  non-linear

37. Siemen

38. Direct coupling

39. Class A

40. less than

41. extinction

42. more current than

43. a controlled switch

44. constant current

45. voltage drop in ac resistance of the tube

46. negative

47. Triode

48. An excessive filament voltage

49. indirectly

50. unidirectional

The Series

Following is the list of multiple choice questions in this brand new series:

Vacuum Tubes MCQs
PART 1: MCQs from Number 1 – 50                        Answer key: PART I
PART 2: MCQs from Number 51 – 100                   Answer key: PART II

Complete List of MCQs in Electronics Engineering per topic

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