NEETS MODULE 15 CHAPTER 1 SYNCHROS
Q-1. What is the name given to a variety of rotary electromechanical, position sensing devices?
Q-2. What is the primary purpose of a synchro system?
Q-3. Name the two general classifications of synchro systems.
Q-4. What is the difference between a torque synchro and a control synchro?
Q-5. Using table 1-1, name two synchros that provide a mechanical output
Q-6. What does the code 26V-11TX4D mean on a synchro nameplate?
Q-7. Which of the two synchro designation codes is indicated by 5DG on a synchro nameplate?
Q8. On the synchro schematic symbol, what indicates the angular displacement of the rotor?
Q-9. What are the two major components of a synchro?
Q-10. Which of the two main types of rotors can have either a single winding or three Y-connectedwindings?
Q-11. How does the stator receive its voltage?
Q-12. Where are the external connections made on standard synchros?
Q-13. What major factors determine the load capacity of a torque-synchro transmitter?
Q-14. Define the term "torque."
Q-15. What unit of measurement refers to the torque of a synchro transmitter?
Q-16. What type of equipment normally uses 26-volt 400-hertz synchros?
Q-17. When will a synchro generate more heat than it is designed to handle?
Q-18. How do synchros differ from conventional transformers?
Q-19. Describe the zero-position of a synchro transmitter
Q-20. When is the maximum voltage induced into a stator coil?
Q-21. What three factors determine the amplitude of the voltage induced into a stator winding?
Q-22. What is the physical difference between a synchro transmitter and a synchro receiver?
Q-23. What method is used to prevent oscillations in large synchro units?
Q-24. What two components make up a simple synchro transmission system?
Q-25. What leads in a simple synchro system are connected to the ac power line?
Q-26. What is the relationship between the transmitter and receiver stator voltages when their rotorsare in correspondence?
Q-27. What is the name given to the angle through which a transmitters rotor is mechanically rotated?
Q-28. What two receiver leads are reversed to reverse the rotor's direction of rotation?
Q-29. What is the most likely problem if the transmitter shaft reads 0º when the receiver shaft indicates180º?
Q-30. What is the purpose of using differential synchros instead of regular synchros?
Q-31. What are the two types of differential synchros?
Q-32. Other than their physical differences, what is the major difference between a TDX and a TDR?
Q-33. What determines whether a differential synchro adds or subtracts?
Q-34. In a TDX system when does the TR rotor follow the TX rotor exactly?
Q-35. What is the angular position of a TX rotor when it is pointing toward the S1 winding? (Hint.Remember synchros are labeled counter clockwise from 0º.)
Q-36. In a TDX system with standard synchro connections, the TX rotor is at 120º and the TDX rotor isat 40º. What position will the TR indicate?
Q-37. What connections in a TDX system are reversed to set up the system for addition?
Q-38. What connections in a TDR system are reversed to set up the system for addition?
Q-39. In a TDR system connected for addition in what direction will the TDR rotor field turn when theTX rotor to which it is connected turns counterclockwise?
Q-40. What type of synchro is used in systems requiring large amounts of power and a high degree ofaccuracy?
Q-41. What are the three types of control synchros?
Q-42. How do the CX and CDX differ from the TX and TDX?
Q-43. What three things prevent a CT rotor from turning when voltages are applied to its statorwindings?
Q-44. When a CT is on electrical zero, what is the relationship between its rotor and the S2 winding?
Q-45. What is the amplitude and voltage induced into the rotor when the CX is turned 90º while the CTremains on electrical zero?
Q-46. What is the name given to the electrical output of a CT?
Q-47. In a control synchro system, when is the output of the CT reduced to zero?
Q-48. What is the purpose of the synchro capacitor?
Q-49. What type of synchros usually require the use of synchro capacitors?
Q-50. What type of current is eliminated by synchro capacitors?
Q-51. How are synchro capacitors connected in a circuit?
Q-52. Why are synchro capacitors placed physically close to differentials transmitters and CTs?
Q-53. What is the name given to the synchro system that transmits data at two different speeds?
Q-54. What is the main reason for using a multispeed synchro system instead of a single-speed synchrosystem?
Q-55. In a dual-speed synchro system what determines the two specific speeds at which the data will betransmitted?
Q-56. What type of synchro system is used to transmit very large quantities?
Q-57. What is the disadvantage of using a double receiver instead of two individual receivers?
Q-58. What is the purpose of "stickoff voltage"?
Q-59. What is the reference point for alignment of all synchro units?
Q-60. What is the most accurate method of zeroing a synchro?
Q-61. What is the purpose of the coarse setting of a synchro?
Q-62. When is a synchro receiver (TR) properly zeroed?
Q-63. What should a voltmeter read when a TX is set on coarse zero?
Q-64. What precaution should you take when you use 115 volts to zero a differential?
Q-65. Why should a synchro be rechecked for zero after it is clamped down?
Q-66. What is the output voltage of a CT when it is set on electrical zero?
Q-67. When you zero a multispeed synchro system which synchro should you zero first?
Q-68. What method of zeroing a synchro is perhaps the fastest but NOT necessarily the most accurate?
Q-69. What restrictions are placed on the use of the electrical lock method?
Q-70. When you zero a synchro with a synchro tester, what is indicated by a jump in the synchro tester'sdial when the S1 and S3 leads are momentarily shorted?
Q-71. What should you do with a synchro that has a bad set of bearings?
Q-72. Name two types of trouble you would expect to find in a newly installed synchro system
Q-73. What type of indicator is usually placed in the stator circuit of a torque synchro system?
Q-74. What is the most probable cause of trouble in a synchro system that has all of its receiversreading incorrectly?
Q-75. If an ac voltmeter is connected between the S2 and S3 windings on a TX, at what two rotorpositions should the voltmeter read maximum voltage?
Q-76. What precaution should you take when substituting a synchro tester in a circuit for a transmitter?
NEETS MODULE 15 CHAPTER 2 SERVOS
Q-1. What is a servo?
Q-2. In an open-loop control system, what action reduces the input to zero so the load is stopped at thedesired position?
Q-3. What basic requirement of a closed-loop system (not present in open-loops) enables present loadposition to be sensed?
Q-4. An error signal is the difference between what two quantities fed to the CT (error detector)?
Q-5. What are the two functions of the servo motor in the system shown in figure 2-2?
Q-6. What are the three relatively common classifications of servo systems by function?
Q-7. The output of the sum point must contain information that controls what two factors of load movement in a position servo?
Q-8. What term is used for a series of overshoots in a servo system?
Q-9. What are two major differences between velocity servos and position servos?
Q-10. In a typical velocity servo block diagram what device is placed in the feedback loop that is notpresent in the position servo?
Q-11. What is the advantage of using a closed-servo loop to control load velocity?
Q-12. If a position servo system tends to oscillate whenever a new position is selected, is the systemoverdamped or underdamped?
Q-13. If a position servo system does not respond to small changes of the input, is the systemoverdamped or underdamped?
Q-14. Why is damping needed in a practical servo system?
Q-15. Error-rate damping is effective because the circuitry has the capability of ______________theamount of overshoot before it happens.
Q-16. In a properly designed servo system that has an oscillating input (order), what should be theresponse of the load?
Q-17. What is the advantage of designing a limited bandwidth into a servo amplifier?
Q-18. When the input and output wipers of a balanced potentiometer are in the same angular position,what is the value of the error voltage?
Q-19. In the output of an ac error detector, what indicates the (a) direction and (b) amount of controlnecessary for correspondence?
Q-20. What two basic types of magnetic devices are used as error detectors?
Q-21. What is the basic difference between the primaries of ac and dc rate generators?
Q-22. What is the purpose of a modulator in a servo system?
Q-23. What is the purpose of a demodulator in a servo system?
Q-24. What is the purpose of a synchronizing network in a servo system?
Q-25. What the three basic components make up the typical magnetic amplifier?
NEETS MODULE 15 CHAPTER 3 GYROS
Q-1. Can any rapidly spinning object be considered a gyroscope?
Q-2. In the drawing in figure 3-1, which axis is the gyro spin axis?
Q-3. What gyro property causes the gyro to remain in a fixed position?
Q-4. What type(s) of force does a gyro resist?
Q-5. In what direction will a gyro precess in response to an outside force?
Q-6. A universally mounted gyro has how many gimbals?
Q-7. What factors determine the rigidity of a gyro?
Q-8. Which gyro rotor in figure 3-6, view (A) view (B) view (C), will have the greatest rigidity if allare rotated at the same speed?
Q-9. What type of force acts ONLY through the center of gravity of a gyro, and does NOT causeprecession?
Q-10. The amount of precession that results from a given force is determined by what quantity?
Q-11. What factor determines the direction a gyro will precess in response to a particular force?
Q-12. When using the tight-hand rule to determine precession, which finger indicates the direction ofthe applied force?
Q-13. A universally mounted gyro has how many degrees of freedom?
Q-14. If a free gyro is placed at the equator at 1200 in a vertical position; in what position should it beat 1800?
Q-15. What are the three causes of mechanical drift in a gyro?
Q-16. What is the purpose of an erection system used with a gyro?
Q-17. What is the purpose of rotating the gimbal assembly in a gyro using a mercury erection system?
Q-18. What are rate gyros primarily used for?
Q-19. How many degrees-of-freedom does a rate gyro usually have?
Q-20. What gyro characteristic provides the basis of the operation of a rate gyro?
Q-21. Operation of an accelerometer is based on what physical property?
Q-22. What type of systems primarily use accelerometers?
Q-23. What special requirement is the pulse counting accelerometer designed for?
NEETS MODULE 15 CHAPTER 4 RELATED DEVICES
Q-1. What two characteristics of IC synchros cause them to differ from standard synchros?
Q-2. Compare the power sources of synchros and step-transmission systems
Q-3. A step transmitter is a modification of what electrical device?
Q-4. What type of mathematical problem is solved by resolvers?
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