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.
Start Practice Exam Test Questions
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.
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