Mcqs of Thyratron and gas-filled tube of the 3rd chapter which are most important and usually this type of Mcqs of thyratron comes in job tests not all of them but 2 or 3 from this post. these Mcqs of thyratron are prepared for the learners who are now trying to get a job.
- A gas diode can passes ……… the equivalent vacuum diode for the same plate voltage.
(i) less current than
(ii) more current than
(iii) same current as
(iv) none of the above
2. ………resistance of gas-filled tube has before ionization
(i) very high (ii) small (iii) very small (iv) zero
3. The (peak inverse voltage) PIV of a hot cathode gas diode is …….. the equivalent vacuum diode.
(i) the same as that of
(ii) more than that of
(iii) less than that of
(iv) none of the above
4. The anode-to-cathode potential of a gas filled tube at which gas deionizes and stops current flowing is called ……..potential.
(i) extinction (ii) striking (iii) ionising (iv) none of the above
5. A thyratron can be used as ……..
(i) an oscillator (ii) an amplifier (iii) a controlled switch (iv) none of the above
6. The gas-filled tube internal resistance is …….. that of a vacuum tube.
(i) the same as (ii) more than (iii) less than (iv) none of the above
7. A cold cathode tube is normally used as a ………..
(i) diode (ii) triode (iii) tetrode (iv) pentode
8. Conduction in a cold cathode tube is begins by ……..
(i) thermionic emission (ii) secondary emission
(iii) natural sources (iv) none of the above
9. The cathode heating of thermionic gas diode requires time is…….. that of a vacuum diode.
(i) the same as (ii) much more than
(iii) much less than (iv) none of the above
10. The solid state equivalent of thyratron is ……..
(i) FET (ii) transistor
(iii) SCR (iv) crystal diode
11. The solid state equivalent of cold cathode diode is ………
(i) zener diode (ii) crystal diode
(iii) LED (iv) transistor
12. The gas-filled tube noise is …….. that in a vacuum tube.
(i) the same as (ii) more than
(iii) less than (iv) none of the above
13. The ionization potential in a gas diode depends upon ……..
(i) plate current (ii) cathode construction
(iii) size of the tube (iv) type and pressure of the gas
- If the gas pressure in a gas-filled diode is enhance, its peak inverse voltage rating ……..
(i) remains the same
(ii) is increased
(iii) is decreased
(iv) none of the above - Once a thyratron is triggered, its control grid …….. over the plate current.
(i) loses all control
(ii) exercises fine control
(iii) exercises rough control
(iv) none of the above - To stop flowing current in a thyratron, the …….. voltage should be reduced to 0.
(i) grid (ii) plate
(iii) filament (iv) none of the above - Ionization of cold cathode diode starts at …….. plate potential compared to hot cathode gas diode.
(i) the same (ii) much higher
(iii) much lesser (iv) none of the above - A gas-filled tube has …….. internal resistance after ionization.
(i) low (ii) high
(iii) very h (iv) moderate - The gas-filled tubes can handle …….. (PIV) as compared to equivalent vacuum tubes.
(i) more (ii) less
(iii) the same (iv) none of the above - A cold-cathode diode is work as a…….. tube.
(i) a rectifier
(ii) a power-controlled
(iii) a regulating
(iv) an amplifier
Chapter Review Topics Thyratron |
- Explain the differences between a gas tube and an equivalent vacuum tube.
- Explain how ionization takes place in a hot-gas diode. How does current flowing take place in such a tube?
- Give the schematic symbols of glow tube, hot-cathode gas diode, and thyratron.
- Explain the construction, operation, and characteristics of a glow tube.
- Discuss some applications of glow tubes.
- What is a thyratron? How does it differ from a vacuum triode?
- Write short notes on the following :
(i) Characteristics of hot-cathode gas diode
(ii) Applications of thyratrons
Discussion Questions Thyratron | Gas filled tube
- What are the advantages of gas tubes over vacuum tubes?
- What is the difference between the action of thyratron and vacuum triode?
- Why cannot thyratrons be used as rectifiers for large voltages?
- Can gas diodes be used as rectifiers for huge voltages?
- What is the disadvantage of a gas diode compared to a thyratron?
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