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Electronics Engineering Objective Questions { Microwave Devices and Circuits }



29. The value of a resistor creating thermal noise is doubled. The noise power generated is
A. halved
B. quadrupled
C. doubled
D. unchanged
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30. The critical frequency of an ionospheric layer whose maximum electron density is 10-12 electrons/m3 is
A. 1012 Hz
B. 9 MHz
C. 106 Hz
D. 2 MHz
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31.  One neper equals ___ dB.
A.3
B.2.718
C.10
D.8.686
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32. The maximum usable frequency is___the critical frequency.
A. lower than
B. equal to
C. higher than
D. has no relation with
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33. In Television, the duration of the horizontal sync pulses of the transmitted signal is approximately ___ microsecond.
A.1
B.2
C.5
D.10
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34. One of the following diodes is not used as a microwave mixer or detector :
A. PIN diode
B. crystal diode
C. Schottky-barrier diode
D. backward diode
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35. One of the following microwave diodes is suitable for very low-power oscillators only.
A. Tunnel
B. Gunn
C. IMPATT
D. LSA
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