2-17. The  six  hamming bits added to the data word enables the DTS to correct what maximum  number  of  data  bits? 1 .    O n e 2 .    T w o 3.  Three 4 .    F o u r 2-18. The DTS is operating in the detect and correct  mode.  A  data  word  is  received by the CDS computer with bit 24=0, and  bit  25=1.  Which  of  the  following conditions is indicated by this bit combination? 1.  No  errors  detected 2.  Parity  error(s)  detected 3.   Odd   bit   error(s)   detected, correction   attempted 4.  Even  errors  detected,  no  correction attempted 2-19. The DTS develops a composite signal consisting  of  what  total  number  of frequency  division  multiplexed audio-frequency  tones? 1 . 2 2. 11 3 . 16 4. 30 2-20. Bits 4 and 5 of a 30-bit data word are carried by which of the following audio tone  frequencies? 1 . 935  Hz 2. 1,155 Hz 3 . 1,265 Hz 4. 1705 Hz 2-21. What is the basic unit of the Link-11 transmission? 1 .    B i t 2.   Tone 3.  Frame 4.   Doppler 2-22. In a single frame, the DTS can tolerate what  maximum  phase  shift  error without  generating  an  error  code? 1 . + 44 degrees only 2. –  44  degrees  only 3 . ± 44 degrees 4. ±135  degrees 2-23. A  phase-shift  error  of  +105  degrees  in any one of the data tones will cause a single bit to be erroneous. 1.   True 2.   False 2-24. Which of the following Link-11 signals allows the receiving unit to correct errors  caused  by  the  relative  motion between the sending and receiving units? 1.  Sync  tone 2.   Doppler   tone 3.   Data   carrying   tones 4.   Motion   correct   tone 2-25. During  the  preamble,  the  2,915  Hz  tone sets  which  of  the  following  references? 1 . Frame  timing  when  the  DTS  is  in corrected  timing 2. Signal power levels when the DTS is  in  corrected  timing 3 . Frame  timing  when  the  DTS  is  in stored  timing 4. Signal power levels when the DTS is in stored timing 12