| 1. | The following waveguide tunning component is not easily adjustable ? | |
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Iris
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Plunger
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Stub
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Screw
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Report Question| 2. | A 1000 V source and detector sensitivity of 1 mV are connected to a long-haul transmission link of attenuation of 1 dB per 100 m. The maximum link length is ? | |
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20 km
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15 km
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10 km
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12 km
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| 3. | Consider the following statements relating to the cavity resonator: 1. The cavity resonator does not possess as many modes as the corresponding waveguide does. 2. The resonant frequencies of cavities are very closely spaced. 3. The resonant frequency of a cavity resonator can be changed by altering its dimension. Which of the above statements is/are correct ? | |
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2 and 3 only
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2 only
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3 only
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1, 2 and 3
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| 4. | Which one of the following types of hollow cavity resonators of the same surface would have the highest Q factor ? | |
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Spherical cavity made of silver
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Cylindrical cavity made of silver
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Cylindrical cavity made of copper
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Spherical cavity made of copper
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| 5. | A dominant mode of a waveguide is characterised by lowest: 1. Cut-off frequency. 2. Cut-off wavelength. 3. Attenuation ? | |
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1 and 3 only
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1 only
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1, 2 and 3
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2 and 3 only
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| 6. | For propagation of a particular mode in waveguide ? | |
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wave number greater than cut-off wave number
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frequency of operation greater than cut-off frequency
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frequency less than cut-off frequency
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Both (a) and (b) above
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| 7. | The phase velocity for the TE10 mode in an air-filled rectangular waveguide is ? | |
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less than C
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greater than c
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equal to c
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None of these
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| 8. | In a rectangular waveguide ? | |
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TE and TEM waves can exist but TM waves cannot exist
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TE, TM and TEM all can exist
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TM and TEM waves can exist but TE waves cannot exist
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TE and TM waves can exist but TEM waves cannot exist
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| 9. | TEM wave cannot propagate in which one of the following ? | |
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Coaxial cable
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Micro-strip line
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Two wire transmission line
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Rectangular waveguide
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| 10. | The main disadvantage of using coaxial cable for microwave signals is its ? | |
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high attenuation
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high sensitivity
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low distortion
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low selectivity
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