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Home ‣ Electronics and Communication Engineering ‣ Radio Receivers See What Others Are Saying!
- Question
In a radio receiver
Options- A. all stages contribute equally to noise
- B. RF stage has no effect on S/N ratio
- C. mixer stage contributes most of the noise generated
- Correct Answer
- mixer stage contributes most of the noise generated
- 1. Which of the following statements is not correct regarding modes of electromagnetic energy transmission?
Options- A. In TE mode the direction of electric field is always and everywhere transverse to the direction of propagation
- B. In TM mode the magnetic field pattern is always and everywhere transverse to the direction of propagation
- C. The subscripts is TE and TM designations denote the number of half sine wave variations of the field components in x and y directions respectively.
- D. TM11 is called the dominant mode. Discuss
- 2. Match the following:
List I (Theorems) List II (Property of Network) A. Reciprocity 1. Impedance matching B. Tellegen's 2. Bilateral C. Superposition 3. ? Vjk Ijk = 0 D. Maximum power transfer 4. Linear 5. Non linear
Options- A. A-1, B-2, C-3, D-4
- B. A-1, B-2, C-3, D-5
- C. A-2, B-3, C-4, D-1
- D. A-2, B-3, C-5, D-1 Discuss
- 3. In a rectangular waveguide there is one half wave variation of electric field across the narrow dimension and two half wave variations of electric field across wider dimension. The dominant mode is
Options- A. TM12
- B. TE13
- C. TE21
- D. TM25 Discuss
- 4. Between which points does UJT exhibit negative resistance characteristics
Options- A. between peak and valley points
- B. before peak point
- C. after peak point
- D. after valley point Discuss
- 5. For satellite communication, standard Earth stations have antenna diameters in the range of __________ metre.
Options- A. 27.5 to 30
- B. 10 to 15
- C. 30 to 50
- D. 5 to 10 Discuss
- 6. A semi converter operates in two quadrants.
Options- A. True
- B. False Discuss
- 7. A cycloconverter uses
Options- A. natural commutation
- B. forced commutation
- C. either natural or forced commutation
- D. both natural and forced commutation together Discuss
- 8. In the given figure the reflected current wave after first reflection is
Options- A. 0.18 A
- B. -0.18 A
- C. 0.3 A
- D. -0.3 A Discuss
- 9. The materials having low retentivity are suitable for making
Options- A. temporary smagnets
- B. weak magnets
- C. permanent magnets
- D. both temporary and permanent magnets Discuss
- 10. A crowbar circuit is generally needed for protection under fault conditions.
Options- A. True
- B. False Discuss
More questions
Correct Answer: TM11 is called the dominant mode.
Correct Answer: A-2, B-3, C-4, D-1
Correct Answer: TE21
Correct Answer: between peak and valley points
Correct Answer: 27.5 to 30
Correct Answer: False
Explanation:
It operates only in quadrant.
Correct Answer: either natural or forced commutation
Correct Answer: -0.18 A
Explanation:
Correct Answer: temporary smagnets
Correct Answer: True
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