Module 15

  1. Which terms accurately describes a synchro?
    • Position-sensing
    • Electromechanical
    • Rotary
  2. What are the two general classifications of synchro systems?
    Torque and control
  3. What is the difference in application between the two classifications of synchros?
    Light versus heavy load
  4. Which type of synchro devices provides a mechanical output?
    A torque receiver
  5. A 115-volt, 400-Hz torque transmitter with a diameter of 2.36 inches will have what military standard designation code?
  6. A 3.5-inch diameter differential receiver will have what Navy prestandard designation code?
  7. What does the arrow on a synchro schematic symbol indicate?
    The angular position of the rotor
  8. What are the two major components of a synchro?
    The rotor and the stator
  9. What type of rotor can be composed of a single winding or three Y-connected windings?
    Drum or wound
  10. How does the stator of a TX receive voltage?
    By a magnetic coupling with the rotor
  11. What part of a synchro provides a point for external connections?
    The terminal board
  12. Which of the following terms is defined as the amount of load a machine can turn?
  13. Which of the following units should be used in measuring the amount of turning force of a synchro?
  14. An overloaded synchro will probably exhibit which of the following conditions?
    Excessive temperature
  15. A synchro receiver has which of the following characteristics that is NOT found in an ordinary transformer?
    A primary that can rotate in relation to the secondary
  16. Damping is necessary for which of the following synchro devices?
  17. The primary purpose of damping is to reduce which of the following conditions in a synchro device?
  18. In a simple synchro system, what leads are connected to the source voltage?
    S1 and S2
  19. When a synchro transmitter, and receiver are in correspondence, what is the relative value of the (a) current through the stators and (b) receiver torque?
    Minimum and minimum
  20. What term applies to the angle through which a synchro transmitter rotor is rotated mechanically?
  21. If a synchro receiver is required to rotate in a direction opposite to the rotation of the transmitter rotor, what leads should be reversed?
    S1 and S3
  22. If a synchro receiver and transmitter are always 180 degrees out of phase with each other, what leads are reversed?
    R1 and R2
  23. What type of synchro can accept two signals simultaneously and add or subtract?
  24. What are the two types of synchro devices that will accept two inputs?
    TDR and TDX
  25. What types of synchro devices have (a)one electrical and one mechanical input and an electrical output; and (b) two electrical inputs and a mechanical outputs?
    TDX and TDR
  26. What determines whether a differential synchro device adds or subtracts its inputs?
    The way it is connected in the system
  27. In a TDX system, for the TR rotor to follow the TX rotor exactly, in what position must the TDX rotor be kept?
    240 degree position
  28. For a TDR system to add its inputs rather than subtract them, what leads must be reversed at the TDR?
    R1 and R3
  29. If a TDR system is connected for addition and the TX rotor connected tothe TDR rotor turns counterclockwise, inwhat direction will the TDR rotor field rotate
  30. Which of the following types of synchros is used in a system requiring large amounts of power and high accuracy?
  31. What are the three types of control synchros?
    CX, CT, CDX
  32. The CX and CDX differ from the TX and TDX because the CX and CDX have which of the following characteristics?
    Higher impedance windings
  33. Which is NOT a characteristic of the rotor of a control transformer (CT) rotor?
    It is connected to an ac source
  34. When a control transformer is at electrical zero, the rotor is perpendicular to what winding?
  35. If a control transformer is held at electrical zero and the control transmitter is turned 90 degrees counterclockwise,what is (a) the amplitude of the induced voltage in the rotor of the control transformer, and (b) the phase relationship of this voltage and the excitation voltage to the control transmitter?
    Maximum and Out-of-phase
  36. If the output of a control transformer is zero, what is the relationship of the rotors of the control transformer and the control transmitters?
    Out of correspondence
  37. Synchro capacitors are used to provide which of the following characteristics ina synchro system?
    Improved accuracy
  38. Which of the following synchro devices uses a synchro capacitor?
  39. What type of current is eliminated by synchro capacitors?
    Magnetizing Stator
  40. To maintain system accuracy, where are synchro capacitors physically placed in a synchro circuit?
    Midway between the TX and CT
  41. Synchro systems that transmit data at two different speeds are referred to by which of the following terms?
  42. Multispeed synchro systems have which of the following advantages over single speed synchro systems?
    Greater accuracy
  43. When a synchro tester is used in place of a synchro transmitter, which of the following precautions will help to keep the tester from being overloaded?
    Use only one syncho receiver
  44. A synchro system with four receivers is malfunctioning. All of the receivers have incorrect readings. Which of the following is/are the most likely cause(s)of the trouble?
    The transmitter
  45. What type of indicating device is usually installed in the stator circuit of a torque synchro system?
    A voltmeter indicator
  46. Which of the following troubles is common in newly installed synchro systems?
    Improper wiring
  47. If you find that a synchro has bad bearings, which of the following actions should you take?
    Replace the synchro
  48. The output voltage of a control transformer on electrical zero is which of the following relative values?
  49. When a tri-speed synchro system is being zeroed, which synchro should be zeroed first?
  50. What method of zeroing a synchro is the fastest but NOT the most accurate?
    The electrical-lock method
  51. The electrical-lock method of zeroing a synchro requires accessible leads and which condition?
    A supply voltage to the stators
  52. A synchro is zeroed by the use of a synchro tester. After it is zeroed, the S1and S3 leads are shorted together, and the synchro tester dial moves. What does this indicate?
    The synchro is not zeroed correctly
  53. Which of the following synchro systems,if any, should be used to transmit very large quantities?
Card Set
Module 15