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- Question
As compared to a p-n junction diode
Options- A. a schottky diode has lower cut in voltage and lower reverse saturation current
- B. a schottky diode has higher cut in voltage and higher reverse saturation current
- C. a Schottky diode has lower cut in voltage and higher reverse saturation current
- D. a schottky diode has higher cut in voltage and lower reverse saturation current
- Correct Answer
- a Schottky diode has lower cut in voltage and higher reverse saturation current
- 1. In a 3 phase bridge inverter with 120° mode of operation the. number of thyristors conducting at one time are
Options- A. 1
- B. 2
- C. 3
- D. 4 Discuss
- 2. A dc chopper is feeding an RLE load. The condition for maximum ripple is
Options- A. a = 1
- B. a = 0.8
- C. a = 0.5
- D. a < 0.5 Discuss
- 3. A half bridge inverter
Options- A. needs a 3 wire dc supply
- B. may use a two wire or 3 wire dc supply
- C. has higher output voltage if fed from 3 wire dc supply
- D. has higher efficiency if fed from 3 wire dc supply Discuss
- 4. Microwave links are typically 50 km apart
Options- A. because of atmospheric attenuation
- B. because of output tube power limitation
- C. because of earth's curvature
- D. to ensure that applied dc voltage is not excessive Discuss
- 5. Match the following:
List I List II A. Effective length of antenna 1. 
B. Capture area 2. 
C. Front to back ratio 3. 
Options- A. A-3, B-2, C-1
- B. A-2, B-3, C-1
- C. A-1, B-3, C-2 Discuss
- 6. In a vacuum tube, the transit time of electron between cathode and anode is important at
Options- A. low frequencies
- B. high frequencies
- C. both (a) and (b)
- D. frequencies which are neither very low nor very high Discuss
- 7. When duct propagation exists
Options- A. the line of sight and diffraction. Zone concepts are payable
- B. the line of sight and diffraction zone concepts are not applicable
- C. line of sight concept is applicable but diffraction zone concept is applicable
- D. diffraction zone concept is not applicable but line of sight concept is not applicable Discuss
- 8. Reflection from the object to be measured is significant only when the wavelength is
Options- A. much bigger than the size of object
- B. much smaller than the size of object
- C. almost of the size of object
- D. either (a) or (c) Discuss
- 9. Compared to coaxial lines, the advantages of wave guides are
Options- A. higher power handling capacity
- B. lower loss per unit length
- C. cheaper and simple mechanical structure
- D. all of the above Discuss
- 10. DC amplifiers have a tendency to be unstable.
Options- A. True
- B. False Discuss
More questions
Correct Answer: 2
Correct Answer: a = 1
Correct Answer: needs a 3 wire dc supply
Correct Answer: because of earth's curvature
Explanation:
Earth's curvature limits the distance between microwave links.
Correct Answer: A-2, B-3, C-1
Correct Answer: high frequencies
Explanation:
At high frequencies transit time is large as compared to the period of microwave signal.
Correct Answer: the line of sight and diffraction zone concepts are not applicable
Correct Answer: much smaller than the size of object
Correct Answer: all of the above
Correct Answer: True
Explanation:
Due to drift.
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