Electron Tubes - Gibilisco MCQs in Electronics

MCQs in Electron Tubes from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco.

Multiple choice questions in Electron Tubes

This is the Multiple Choice Questions (MCQs) in Chapter 29: Electron Tubes from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.

Begin the Test

1. One difference between a triode and an N-channel FET is that:

  • A. Triodes work with lower voltages.
  • B. Triodes are more compact.
  • C. Triodes need more voltage.
  • D. Triodes don’t need filaments.

2. The control grid of a tube corresponds to the:

  • A. Source of an FET.
  • B. Collector of a bipolar transistor.
  • C. Anode of a diode.
  • D. Gate of an FET.

3. The intensity of the electron flow in a vacuum tube depends on all of the following except:

  • A. The gate voltage.
  • B. The power supply voltage.
  • C. The grid voltage.
  • D. The voltage between the cathode and the plate.

4. Which type of tube maintains constant voltage drop with changes in current?

  • A. A triode.
  • B. A gas-filled regulator.
  • C. A tetrode.
  • D. A pentagrid converter.

5. In a tube with a directly heated cathode:

  • A. The filament is separate from the cathode.
  • B. The grid is connected to the filament.
  • C. The filament serves as the cathode.
  • D. There is no filament.

6. In a tube with a cold cathode:

  • A. The filament is separate from the cathode.
  • B. The grid is connected to the filament.
  • C. The filament serves as the cathode.
  • D. There is no filament.

7. A screen grid enhances tube operation by:

  • A. Decreasing the gain.
  • B. Decreasing the plate voltage.
  • C. Decreasing the grid-to-plate capacitance.
  • D. Pulling excess electrons from the plate.

8. A tube with three grids is called a:

  • A. Triode.
  • B. Tetrode.
  • C. Pentode.
  • D. Hexode.

9. A tube type radio receiver:

  • A. Is bulky and heavy.
  • B. Requires low voltage.
  • C. Is more sensitive than a transistorized radio.
  • D. All of the above.

10. An advantage of a grounded-grid power amplifier is:

  • A. Excellent sensitivity.
  • B. High impedance.
  • C. Low noise.
  • D. Good stability.

11. A heptode tube has:

  • A. Two grids.
  • B. Three grids.
  • C. Five grids.
  • D. Seven grids.

12. The electron gun in a CRT is another name for its:

  • A. Cathode.
  • B. Anode.
  • C. Control grid.
  • D. Screen grid.

13. The electron beam in an electrostatic CRT is bent by:

  • A. A magnetic field.
  • B. An electric field.
  • C. A fluctuating current.
  • D. A constant current.

14. The horizontal displacement on an oscilloscope CRT screen is usually measured in:

  • A. Frequency per unit division.
  • B. Current per unit division.
  • C. Time per unit division.
  • D. Voltage per unit division.

15. In a time-domain oscilloscope, the waveform to be analyzed is usually applied to the:

  • A. Control grid plates or coils.
  • B. Anode plates or coils.
  • C. Vertical deflection plates or coils.
  • D. Horizontal deflection plates or coils.

16. A vidicon camera tube is noted for its:

  • A. Sensitivity.
  • B. Large size.
  • C. Heavy weight.
  • D. Rapid response.

17. In a magnetron, as the frequency is increased:

  • A. The achievable power output increases.
  • B. The achievable power output decreases.
  • C. The output power stays the same.
  • D. The output power increases and decreases alternately.

18. The paths of the electrons in a magnetron are spirals, rather than straight lines, because of:

  • A. The extreme voltage used.
  • B. The longitudinal magnetic flux.
  • C. The bunching-up of the electrons.
  • D. The shapes of the cavities.

19. A klystron is noted for its:

  • A. Spiralling electrons.
  • B. Low noise output.
  • C. High achievable output power.
  • D. Magnetic-field intensity.

20. In a multicavity klystron, the electrons:

  • A. Have variable speed.
  • B. Travel in circles.
  • C. Are reflected by the cavities.
  • D. Are drawn out via the cathode.

Complete List of Multiple Choice Questions from this Book

Check your work.


Labels:

Post a Comment

Contact Form

Name

Email *

Message *

Powered by Blogger.
Javascript DisablePlease Enable Javascript To See All Widget