GATE Exam Previous year question papers for ECE stream

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12. For 8085 mi croprocessor, the fol lowing program i s
executed.
MVI A, 05H;
MVI B, 05H;
PTR: ADD B;
DCR B;
JNZ PTR;
ADI 03H;
HLT;
At the end of program, accumulator contains
(a) 17H (b) 20H
(c) 23H (d) 05H

13. The bi t rate of a digi tal communi cat ion system i s
R kbits/s. The modulation used is 32-QAM. The minimum
bandwidth requi red for ISI free t ransmission is
(a) R/ 10 Hz (b) R/ 10 kHz
(c) R/ 5 Hz (d) R/ 5 kHz

14. For a per iodic signal v(t) = 30 sin 100t + 10 cos 300 t + 6
sin (500t + /4), the fundamental frequency in rad/s is
(a) 100 (b) 300
(c) 500 (d) 1500

16. A band-l imi ted signal wi th a maximum frequency of
5kHz is to be sampled. According to the sampl ing
theorem, the sampl ing frequency which is not val id is
(a) 5 kHz
(b) 12 kHz
(c) 15 kHz
(d) 20 kHz






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