Download DUET Master 2018 DU MSc Electronics Question Paper With Answer Key

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DU MSc Electronics

Topic:- DU_J18_MSC_ELEC

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1. A DC voltage source is connected across a series R-L-C circuit. Under steady conditions, the applied DC voltage drops entirely across the: [Question ID = 52409]
   1. L only [Option ID = 89630]
   2. C only [Option ID = 89628]
   3. R only [Option ID = 89629]
   4. R and L combination [Option ID = 89631]

   Correct Answer :-

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   C only [Option ID = 89628]

2. A modulating signal is amplified by a 80% efficiency amplifier before being combined with a 20 kW carrier to generate an AM signal. For the system to operate at 100% modulation, the required DC input power to the amplifier would be [Question ID = 52466]
   1. 6.25 kW [Option ID = 89859]
   2. 5 kW [Option ID = 89856]
   3. 8.46 kW [Option ID = 89857]

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   4. 12.5 kW [Option ID = 89858]

   Correct Answer :-

   12.5 kW [Option ID = 89858]

3. Ring modulator is used to produce: [Question ID = 52457]
   1. USB [Option ID = 89821]

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   2. DSB-SC [Option ID = 89822]
   3. VSB [Option ID = 89823]
   4. SSB [Option ID = 89820]

   Correct Answer :-

   DSB-SC [Option ID = 89822]

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4. An amplifier has its average standard noise figure that cannot exceed 1.7 (Room temperature 290 K), the maximum average effective input noise temperature of this amplifier is [Question ID = 52465]
   1. 235 K [Option ID = 89854]
   2. 215 K [Option ID = 89853]
   3. 255 K [Option ID = 89852]
   4. 203 K [Option ID = 89855]

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   Correct Answer :-

   203 K [Option ID = 89855]

5. How many interrupts can 8259 A handle: [Question ID = 52438]
   1. 6 [Option ID = 89747]
   2. 2 [Option ID = 89745]

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   3. 8 [Option ID = 89746]
   4. 4 [Option ID = 89744]

   Correct Answer :-

   8 [Option ID = 89746]

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6. The upper frequency of the thermocouple based instruments is limited by [Question ID = 52406]
   1. only inductances of connecting leads [Option ID = 89617]
   2. temperature coefficient of thermocouple [Option ID = 89618]
   3. only capacitances of connecting leads [Option ID = 89616]
   4. capacitances and inductances of connecting leads [Option ID = 89619]

   Correct Answer :-

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   capacitances and inductances of connecting leads [Option ID = 89619]

7. In FM wave the maximum frequency deviation is 50 kHz and the modulating frequency is 5 kHz, the modulation index is [Question ID = 52463]
   1. 15 [Option ID = 89844]
   2. 20 [Option ID = 89846]
   3. 10 [Option ID = 89845]

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   4. 25 [Option ID = 89847]

   Correct Answer :-

   10 [Option ID = 89845]

8. The data transmission rate of a modem is measured in [Question ID = 52468]
   1. baud rate [Option ID = 89866]

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   2. bits per second [Option ID = 89865]
   3. bytes per second [Option ID = 89864]
   4. megahertz [Option ID = 89867]

   Correct Answer :-

   bits per second [Option ID = 89865]

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9. At higher frequencies, the CMRR of an op-amp [Question ID = 52420]
   1. becomes zero [Option ID = 89675]
   2. remains constant [Option ID = 89674]
   3. increases [Option ID = 89672]
   4. reduces [Option ID = 89673]

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   Correct Answer :-

   reduces [Option ID = 89673]

10. The instruction RST 7 is a: [Question ID = 52436]
    1. Restart instruction that begins the execution of a program [Option ID = 89736]
    2. One -byte call to the memory address 0038 H [Option ID = 89739]

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    3. One -byte call to the memory address 0007 H [Option ID = 89737]
    4. Hardware interrupt [Option ID = 89738]

    Correct Answer :-

    One -byte call to the memory address 0038 H [Option ID = 89739]

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11. After REST, the CPU begins execution from memory location: [Question ID = 52439]
    1. FFFF H [Option ID = 89749]
    2. 0001 H [Option ID = 89750]
    3. 8000 H [Option ID = 89751]
    4. 0000 H [Option ID = 89748]

    Correct Answer :-

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    0000 H [Option ID = 89748]

12. Load regulation is determined by [Question ID = 52424]
    1. zener current and load current [Option ID = 89691]
    2. changes in load resistance and input voltage [Option ID = 89690]
    3. changes in load current and output voltage. [Option ID = 89689]

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    4. changes in load current and input voltage. [Option ID = 89688]

    Correct Answer :-

    • changes in load current and output voltage. [Option ID = 89689]

13. The push source copies a word from source to: [Question ID = 52440]
    1. Stack [Option ID = 89752]

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    2. Destination [Option ID = 89755]
    3. Register [Option ID = 89754]
    4. Memory [Option ID = 89753]

    Correct Answer :-

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14. The diffraction pattern shown in the figure is obtained in the far field when a collimated beam of monochromatic light illuminates an N-slits aperture. The value of N is
    

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