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.
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⇐ Gibilisco: MCQ in Integrated Circuits and Data Storage Media | ECE Board Exam
Choose the letter of the best answer in each 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.
Answer: Option C
Solution:
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.
Answer: Option D
Solution:
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.
Answer: Option A
Solution:
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.
Answer: Option B
Solution:
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.
Answer: Option C
Solution:
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.
Answer: Option D
Solution:
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.
Answer: Option C
Solution:
8. A tube with three grids is called a:
A. Triode.
B. Tetrode.
C. Pentode.
D. Hexode.
Answer: Option C
Solution:
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.
Answer: Option A
Solution:
10. An advantage of a grounded-grid power amplifier is:
A. Excellent sensitivity.
B. High impedance.
C. Low noise.
D. Good stability.
Answer: Option D
Solution:
11. A heptode tube has:
A. Two grids.
B. Three grids.
C. Five grids.
D. Seven grids.
Answer: Option C
Solution:
12. The electron gun in a CRT is another name for its:
A. Cathode.
B. Anode.
C. Control grid.
D. Screen grid.
Answer: Option A
Solution:
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.
Answer: Option B
Solution:
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.
Answer: Option C
Solution:
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.
Answer: Option C
Solution:
16. A vidicon camera tube is noted for its:
A. Sensitivity.
B. Large size.
C. Heavy weight.
D. Rapid response.
Answer: Option A
Solution:
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.
Answer: Option B
Solution:
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.
Answer: Option B
Solution:
19. A klystron is noted for its:
A. Spiralling electrons.
B. Low noise output.
C. High achievable output power.
D. Magnetic-field intensity.
Answer: Option C
Solution:
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.
Answer: Option A
Solution:
Topics Included in the Test from Chapter 19 to Chapter 30
Complete List of Multiple Choice Questions from this Book
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