Download DUET Master 2018 DU MTech Microwave Electronics Question Paper With Answer Key

DU MTech Microwave Electronics

Topic:- DU_J18_MTECH_ME

1. The Poynting vector S of an electromagnetic wave is given by

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   [Question ID = 51857]

   1. E x H [Option ID = 87422]
   2. E x B [Option ID = 87420]
   3. E / H [Option ID = 87421]
   4. E / B [Option ID = 87423]

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   Correct Answer :-

   E x H [Option ID = 87422]

2. A potential field exists in a region where ? = f(x). If ?_v = 0, ?²V is

   [Question ID = 51856]

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   1. -f(x) d²V / dx² [Option ID = 87419]
   2. -1 / f(x) d²V / dx² [Option ID = 87417]
   3. -1 / f(x) d²V / dx² [Option ID = 87418]
   4. -f(x) d²V / dx² [Option ID = 87416]

   Correct Answer :-

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   -1 / f(x) d²V / dx² [Option ID = 87417]

3. Find the correct match between group-I and group-II

   Group-I	Group-II
   P. varactor diode	1. voltage reference
   Q. PIN diode	2. high frequency switches
   R. Zener diode	3. tuned circuits
   S. Schottky diode	4. current controlled attenuator

   [Question ID = 51832]

   1. P Q R S 4 2 1 3 [Option ID = 87323]

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   2. P Q R S 2 3 4 1 [Option ID = 87320]
   3. P Q R S 3 4 1 2 [Option ID = 87321]
   4. P Q R S 3 4 2 1 [Option ID = 87322]

   Correct Answer :-

   P Q R S 3 4 1 2 [Option ID = 87321]

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4. A triangle in the xy-plane is bounded by the straight lines 2x=3y, y = 0 and x = 3. The volume above the triangle and under the plane x+y+z=6 is

   [Question ID = 51782]

   1. 20 [Option ID = 87123]
   2. 10 [Option ID = 87122]

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   3. 10.5 [Option ID = 87120]
   4. 15 [Option ID = 87121]

   Correct Answer :-

   10 [Option ID = 87122]

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5. The measured reflection coefficient of an isolator at input port is 0.1, the percentage ratio of power reflected to power incident is

   [Question ID = 51869]

   1. 1% [Option ID = 87470]
   2. 0.1% [Option ID = 87471]
   3. 0% [Option ID = 87469]

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   4. 10% [Option ID = 87468]

   Correct Answer :-

   1% [Option ID = 87470]

6. Consider the lossless transmission shown in figure

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