| 1. | In parametric amplifiers used in microwave communication systems, the gain is mainly restricted by ? | |
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pump frequency
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pump bandwidth
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ambient temperature
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pump energy
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Report Question| 2. | A screw projection in a waveguide is ? | |
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capacitive discontinuity
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an inductive discontinuity
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either (a) or (b)
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resistive discontinuity
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| 3. | A matched load is a ? | |
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variable attenuator
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fixed attenuator
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rotary attenuator
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phase shifter
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| 4. | To couple a coaxial line to a parallel wire, it is best to use a ? | |
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Slotted line
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Directional coupler
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Balun
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Quarter wave transformer
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| 5. | Baratters and bolometers are used for measurement of ? | |
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VSWR
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microwave power
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frequency
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transmission losses
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| 6. | A cylindrical cavity resonator has diameter of 24 mm and length 20 mm. The dominant mode and the lowest frequency band are operated as ? | |
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TM011 and Ku-band
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TM010 and X-band
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TM and C-band
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TE and X-band
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| 7. | The phase velocity of an electromagnetic wave propagating in a hollow metallic rectangular waveguide in the TE mode is ? | |
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equal to the velocity of light in free space
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less than the velocity of light in free space
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greater than the velocity of light in free space
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equal to its group velocity
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| 8. | Which of the following introduces mode partition noise ? | |
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Fibre transmission line
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Coaxial line
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Waveguide
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Both coaxial line and waveguide
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| 9. | When electromagnetic waves are propagated in a waveguide ? | |
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they are reflected from the walls but do not travel along the walls
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they travel along the walls of the waveguide
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they travel through the dielectric without touching the walls
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None of these
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| 10. | Pure TEM mode is the propagation mode in ? | |
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strip line
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microstrip line
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coplanar waveguide
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slot line
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