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Assignment 12-Cont. - 14100_479
Assignment 12-Cont. - 14100_481

Fire Controlman Volume 03-Digital Data Systems
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12-19. A motor that moves imprecise detents when a drive signal is applied is known as a 1.  voice  coil  motor 2. stepper motor 3. servo motor 4. synchro 12-20. Which of the following actuators could suffer a loss of data because of variations in temperature? 1. Voice coil 2. Stepper motor 3. Servo motor 4. Synchro 12-21. For proper positioning of the heads, which of the following actuators requires a dedicated servo surface or servo signal embedded in the sector gaps? 1. Voice coil 2. Stepper motor 3. Servo motor 4. Synchro 12-22. The speed of the spindle motor in a fixed disk is controlled by which of the following devices? 1.  An  optical  sensor 2. A tachometer only 3. A feedback loop only 4. A tachometer and feedback loop 12-23. Timing and synchronization between a fixed disk drive and the drive controller are accomplished by which of the following means? 1. A clock on the controller 2. A clock on the disk drive logic board 3. Special timing signals on the disk 4. Data and flux reversal pulses 12-24. Which of the following data encoding methods is NOT used with fixed disk drives? 1. Modified frequency modulation 2.  Frequency  modulation 3. Run length limited 4.  Non-return-to-zero  indiscrete 12-25. A fixed disk system that uses frequency modulation to encode data will store the byte 1010 0001 as which of the following codes (P=pulse, N=no pulse)? 1.  PPPPNPNPNPPPPPNP 2.  PPPNPPPNPNPNPNPP 3.  NPPPNPPPPPPPPPNP 4.  NPNPNPNPNPNPNPNP 12-26. Which of the following data encoding methods groups bits together and uses a table to determine what code is written on the disk? 1.  Non-return-to-zero 2.  Frequency  modulation 3. Modified frequency modulation 4. Run length limited 12-27. A fixed disk system using modified frequency modulation will encode a logic ZERO that is preceded by a logic ONE in which of the following ways? 1. No pulse followed by a pulse 2. A pulse followed by no pulse 3. Two no-pulse periods 4.  Two  pulses 12-28. Which of the following encoding methods will increase by 50 percent the data density and transfer rate of a fixed disk system? 1. Run length limited 2.  Non-return-to-zero 3.  Frequency  modulation 4. Modified frequency modulation 12-29. The encoding method used to write data on a fixed disk is determined by which of the following means? 1. The application software installed in the computer 2. The disk operating system (DOS) installed in the  computer 3. The disk controller 4. The manufacturer of the disk drive 84






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