| 1. | In a hollow rectangular waveguide, the phase velocity ? | |
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is independent of frequency
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will vary with frequency depending upon the frequency range
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increases with increasing frequency
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decreases with increasing frequency
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Report Question| 2. | The degenerate modes in a waveguide are characterised by ? | |
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different cut-off frequencies but same field distributions
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same cut-off frequencies but different field distributions
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same cut-off frequencies and same field distributions
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different cut-off frequencies and different field distributions
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| 3. | A rectangular waveguide has dimensions 1 cm x 0.5 cm. Its cut off frequency is ? | |
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15 GHz
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20 GHz
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10 GHz
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5 GHz
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| 4. | The cut-off frequency of the dominant mode of a rectangular waveguide having aspect ratio more than 2 is 10 GHz. The inner broad wall dimension is given by ? | |
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1.5 cm
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3 m
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2.5 cm
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2 cm
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| 5. | An H-plane tee is also known as ? | |
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hybrid tee
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magic tee
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shunt tee
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series tee
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| 6. | A directional coupler with three or more holes is sometimes used in preference to the two-hole coupler ? | |
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to increase the bandwidth of the system
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because it is more efficient
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to reduce spurious mode generation
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to increase coupling of the signal
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| 7. | The action of backward wave oscillator is similar to that of ? | |
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klystron amplifier
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TWT
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magnetron
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reflex klystron oscillator
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| 8. | The diagram to show distance time history of electrons in klystron amplifier is called ? | |
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asynchronous diagram
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apple gate diagram
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velocity modulation diagram
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bunching diagram
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| 9. | Which of the following lines is non-radiating ? | |
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Open two wire
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Both
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None
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Coaxial
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| 10. | The velocity factor of a transmission line depends on ? | |
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relative permittivity of dielectric
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skin effect
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temperature
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none of the above
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