| 1. | In order to couple two generators to a waveguide system without coupling them to each other one, one could not use a ? | |
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Magic Tee
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hybrid ring
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E-plane Tee
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rat-race
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Report Question| 2. | Which one of the following can be used for amplification of microwave energy ? | |
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Reflex klystron
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Travelling wave tube
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Magnetron
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Gunn diode
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| 3. | The TWT amplifier is sometimes preferred to the multicavity klystron amplifier because the former ? | |
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is more efficient
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has a higher number of modes
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has a greater BW
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produces high output power
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| 4. | In travelling wave tube microwave amplifiers, the velocity modulation and bunching of electrons are achieved by the electromagnetic wave supported in the slow wave structure. Which one of the following field components is responsible for the above ? | |
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The electric field component transverse to the electron beam propagation
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The magnetic field component in the direction of the electron beam propagation
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The electric field component in the direction of the electron beam propagation
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The magnetic field component transverse to the electron beam propagation
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| 5. | Microwave source used for a microwave oven is ? | |
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reflex klystron
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BWO
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magnetron
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IMPATT diode
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| 6. | Cylindrical cavity resonators are not used with klystron because they have ? | |
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a shape whose resonant frequency is too difficult
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a Q that is too low
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too heavy losses
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harmonically related resonant frequencies
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| 7. | To avoid difficulties with strapping at high frequencies, what type of cavity structure is used in the magnetron ? | |
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Hole and slot
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Rising sun
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Slot
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Vane
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| 8. | In a VSWR measurement, a square law detector is used to detect the signal level. The voltmeter reads maximum and minimum as 64 mV and 16 mV respectively. The VSWR of the system will be ? | |
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2
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4
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8
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16
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| 9. | The 'Double minimum or the "Width of minimum power" method is used in microwave measurements for the measurement of ? | |
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high VSWR
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frequency distortion
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velocity modulation
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low VSWR
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| 10. | "Double-the-minimum" method is relevant to the measurement of ? | |
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high attenuation coefficient
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high VSWR
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low attenuation coefficient
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low VSWR
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