MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Reflector Antenna knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following uses a concave sub-reflector in a dual reflector antenna? |
| A. | Cassegrain |
| B. | Gregorian |
| C. | Both Gregorian &Cassegrain |
| D. | Neither Gregorian nor Cassegrain |
| Answer» C. Both Gregorian &Cassegrain | |
| 2. |
When a dipole with a parasitic reflector is used as a feed system, the distance between them is _____ |
| A. | 0.125λ |
| B. | 0.4λ |
| C. | 1λ |
| D. | 0.625λ |
| Answer» B. 0.4λ | |
| 3. |
Which of the following regarding the Cassegrain feed system is false? |
| A. | Spill over is reduced |
| B. | It is a dual reflector antenna |
| C. | Minor lobe radiation increases |
| D. | A convex sub-reflector is used |
| Answer» D. A convex sub-reflector is used | |
| 4. |
Which of the following coincides with the focus of the parabolic reflector in a Cassegrain antenna? |
| A. | Feed |
| B. | Parabolic reflector |
| C. | Focus of hyperboloid reflector |
| D. | Focus of primary radiator |
| Answer» D. Focus of primary radiator | |
| 5. |
In a Cassegrain feed system; the feed is placed at _____ |
| A. | Focus |
| B. | Vertex |
| C. | Directrix |
| D. | Anywhere between vertex and focus |
| Answer» C. Directrix | |
| 6. |
The beam gets deteriorated when it is moved along a line perpendicular to the main axis passing through focus? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
When the feed is moved along the main axis in a reflector antenna what happens to the beam pattern? |
| A. | It broadens |
| B. | It deteriorates |
| C. | Beam remains unchanged |
| D. | Side lobes are increased |
| Answer» B. It deteriorates | |
| 8. |
To obtain maximum beam pattern, the primary radiator is placed ______ in a reflector antenna. |
| A. | between Focus and Directrix |
| B. | after the focus |
| C. | at the focus point |
| D. | can be placed anywhere |
| Answer» D. can be placed anywhere | |
| 9. |
In which of the following cases, a parabolic reflector primary radiator is said to be ideal feed? |
| A. | The entire reflector is illuminated with no radiation in unwanted direction when feed radiated entire energy towards it |
| B. | Some part of reflector is illuminated with no radiation in unwanted direction when feed radiated entire energy towards it |
| C. | Some part of reflector is illuminated with radiation in unwanted direction when feed radiated entire energy towards it |
| D. | The entire reflector is illuminated with small radiation in unwanted direction when feed radiated entire energy towards it |
| Answer» B. Some part of reflector is illuminated with no radiation in unwanted direction when feed radiated entire energy towards it | |
| 10. |
Which of the following is called as the source placed at the focus? |
| A. | Feed radiator |
| B. | Reflector |
| C. | Secondary radiator |
| D. | Primary / reflector |
| Answer» B. Reflector | |