| 1. | Consider the transmission line of length 37.5 cm, which is terminated into zero resistance. This line is being excited by a source of 1 GHz which has an internal impedance of 50 2. What is the input impedance of the line as seen by the source ? | |
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Zero ?
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100 ?
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50 ?
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Infinite ?
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Report Question| 2. | 13 dBm is equivalent to ? | |
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20 W
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2 MW
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2 mW
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20 mW
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| 3. | The following components are used for measuring frequency in microwave test bench: 1. Microwave source. 2. Resonant cavity type frequency meter. 3. Power meter. 4. Variable attenuator. What is the correct sequence of connection of these bench components for measurement of frequency ? | |
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3, 4, 2 and 1
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1, 2, 4 and 3
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3, 2, 4 and 1
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1,4, 2 and 3
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| 4. | MMIC means ? | |
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miniature microwave IC
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millimeter microwave IC
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monolithic microwave IC
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millimeter IC
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| 5. | An IMPATT diode has a drift length of 4 µm. The drift velocity Si is 105 m/s. The operating frequency of the IMPATT diode ? | |
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25 GHz
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125 MHz
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20 GHz
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12.5 GHz
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| 6. | In a Gunn oscillator where the diode is operated in a tunable resonant circuit, most of the sample length of the Gunn device is maintained in the negative conductance state during most of the R.F. cycle for ? | |
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LSA mode
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delayed domain mode
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hybrid mode
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quenched domain mode
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| 7. | The efficiency of an ideal klystron is about ? | |
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54%
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30%
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70%
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85%
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| 8. | Slow wave structure of a TWT is provided with an attenuator in order to ? | |
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reduce noise
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prevent RF power from reaching the output of the device
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prevent oscillation
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use broadband the device
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| 9. | The following components are used to measure power output of a 2 kW TWT amplifier: 1. TWTA. 2. Low pass/high pass filter. 3. 20 dB attenuator. 4. 40 dB directional complex with matched load. 5. Power meter. What is the correct sequence of connection of these components ? | |
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1-3-4-2-5
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2-4-1-3-5
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2-4-1-5-3
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1-2-4-3-5
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| 10. | Consider the following pairs: 1. Travelling wavetube : Linear electron beam 2. Cavity Magnetron : Strapping 3. Amplitron : CFA Which of the pairs given above are correctly matched ? | |
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2 and 3
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1, 2 and 3
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1 and 3
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1 and 2
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