Discussion
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- Question
A klystron amplifier generally uses Pierce gun
Options- A. True
- B. False
- Correct Answer
- True
ExplanationIt uses a single cavity resonator for generating microwave oscillations.Its parts are electron gun, resonator, repeller and output coupling.
It operates on the principle of positive feed back.
The repeller electrode is at negative potential and sends the partially bunched electron beam back to resonator cavity.
This positive feedback supports oscillations. Its feature are:
1. Frequency range - 2 to 100 GHz
2. Power output - 10 MW to about 2 W
3. Efficiency - 10 - 20 %
Its applications include radar receivers, local oscillator in microwave devices, oscillator for microwave measurements in laboratories etc.
More questions
- 1. The attenuation characteristics of a loaded line is similar to that of
Options- A. low pass filter
- B. high pass filter
- C. band pass filter
- D. band stop filter Discuss
Correct Answer: band stop filter
- 2. In a single phase full wave regulator feeding R-L load, short gate pulse are not suitable.
Options- A. True
- B. False Discuss
Correct Answer: True
- 3. The household radio receiver uses
Options- A. synchronous
- B. envelope detector
- C. radio detector
- D. none of the above Discuss
Correct Answer: envelope detector
- 4. Which chopper circuit uses saturable reactor?
Options- A. Auxiliary commutated
- B. Jones chopper
- C. Morgan chopper
- D. Load commutated Discuss
Correct Answer: Morgan chopper
- 5. For an illumination control circuit it is advisable to use a matched TRIAC-DIAC pair.
Options- A. True
- B. False Discuss
Correct Answer: True
- 6. Fibers have numerical aperture (NA) in the range of 0.15 to 0.4 Fibers with higher NA value would have
Options- A. reduced losses
- B. high bandwidth
- C. reduced losses and low bandwidth
- D. more losses and low bandwidth Discuss
Correct Answer: more losses and low bandwidth
- 7. Radar reciever has high sensitivity and low noise figure
Options- A. True
- B. False Discuss
Correct Answer: True
- 8. A single phase electric heater uses phase controlled thyristors. The firing angle is 90°. The degree of heating is
Options- A. 25% of maximum
- B. 50% of maximum
- C. 75% of maximum
- D. none of the above Discuss
Correct Answer: 50% of maximum
Explanation:
Conduction occurs only during 50% of wave.- 9. A characteristic property of crystal is its periodicity of structure.
Options- A. True
- B. False Discuss
Correct Answer: True
- 10. The number of distinct Boolean expression of 4 variables is
Options- A. 16
- B. 256
- C. 1024
- D. 65536 Discuss
Correct Answer: 65536
Explanation:
22n = 224 = 216 .
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