ISRO EXAM ELECTRONICS 2009

ISRO EXAM ELECTRONICS 2009

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Paper contains 80 questions and the time is 90 min.


Each correct answer carries +3 marks and each wrong answer carries -1 marks.


There will be 5 sets of question papers.



In this paper most of the questions are from EMTL, AWT, DIGITAL ELECTRONICS,

COMMUNICATION SYSTEMS AND NETWORKS AND FEW QUESTIONS ONLY ANALOG ELECTRONICS

AND ALL OTHER REMAINING SUBJECTS.

1. 
   A 5 bit DAC has a current output. For a digital input of 10100, an output current of 10mA is produced. What will be the output current for a digital input of 11101?
   
   
   
   1. 14.5 mA
   2. 10 mA
   3. 100 mA
   4. Not possible to calculate
   
   
   
   




2. 
   The ethernet protocol uses
   
   
   
   1. CSMA/CA
   2. SCPC
   3. CSMA/CD
   4. SLOTTED ALOHA
   
   
   
   
   
   
   
   
3. 
   A micro controller differs from a microprocessor in terms of
   
   
   
   1. I/O interfaces and instruction decoding
   
   
   2. Memory configuration and I/O interfaces
   
   
   3. Data Bus width and Clock speed
   
   
   4. Memory configuration and instruction decoding
   
   
   
   





4. 
   An 8-bit microcontroller has an external RAM with the memory map from 8000H to 9FFFH.
   
   
   
   1. 8193
   
   
   2. 8192
   
   
   3. 8191
   
   
   4. 8190
   
   
   
   





5. 
   An audio frequency of 15KHz is frequency modulated with a deviation of 75KHz. The resulting bandwidth is
   
   
   
   1. 180KHz
   2. 150KHz
   3. 210KHz
   4. 240KHz