| 1. | Which of the following transmission structures is ideal for transmitting high powers from one point to another point ? | |
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Rectangular waveguide
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Coaxial line
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Stripline
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Microstrip
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Report Question| 2. | A microwave junction is supposed to be matched if in the S-matrix ? | |
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all diagonal elements are equal but not zero
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is Hermitian
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all diagonal elements are complex
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all diagonal elements are zero
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| 3. | Which of the following devices has the ‘negative resistance' characteristic ? | |
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Reflex klystron
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Magnetron
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Gunn diode
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P-N-P transistor
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| 4. | A two-port non-reciprocal device which produces a minimum attenuation to em wave propagation in one direction and a very high attenuation in opposite direction is generally known as ? | |
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polariser
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isolator
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phase shifter
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circulator
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| 5. | What is a waveguide device which is designed with steps in either the magnetic or electric plane known as ? | |
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Impedance canceller
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Conductance converter
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Impedance transformer
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Reactance follower
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| 6. | A metal probe inserted into a rectangular waveguide through the broader wall of the guide will provide a property across the guide. This property is a ? | |
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reverberation
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shunt
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reactance
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resonance
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| 7. | Larger microwave power can be measured by ? | |
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bolometer
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wavemeter
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calorimeter wattmeter
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wattmeter
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| 8. | In a microwave test bench, why is the microwave signal amplitude modulated at 1 kHz ? | |
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To increase the sensitivity of measurement
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Because crystal detector fails at microwave frequencies
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To study amplitude modulation
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To transmit the signal to a far-off place
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| 9. | If the peak power of pulsed microwave system is 10 W and the average power is 800 W, then the duty cycle will be ? | |
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8%
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80%
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0.8%
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0.08%
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| 10. | Magic tee is a combination of ? | |
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one H and two E-plane tee
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one H and one E-plane tee
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two H and one E-plane tee
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None of the above
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