Description : In a TDX system when does the TR rotor follow the TX rotor exactly?
Last Answer : . When the TDX rotor is on 0º.
Description : What connections in a TDX system are reversed to set up the system for addition?
Last Answer : The number and type of synchro receivers, the mechanical loads on these receivers and the operating temperatures of both the transmitter and receivers.
Description : How do the CX and CDX differ from the TX and TDX?
Last Answer : The CX and CDX have higher impedance windings
Description : When is a synchro receiver (TR) properly zeroed?
Last Answer : A TR is zeroed when electrical zero voltages exist across its stator windings at the same time its rotor is on zero or on its mechanical reference position.
Description : What is the angular position of a TX rotor when it is
Last Answer : The S1 and S3 leads are reversed between the TX and the TDX, and the R1 and R3 leads are reversed between the TDX rotor and the TR.
Description : On the synchro schematic symbol, what indicates the angular displacement of the rotor?
Last Answer : . The position of the arrow.
Description : In a TDR system connected for addition in what direction will the TDR rotor field turn when the TX rotor to which it is connected turns counterclockwise?
Last Answer : Clockwise.
Description : If an ac voltmeter is connected between the S2 and S3 windings on a TX, at what two rotor positions should the voltmeter read maximum voltage?
Last Answer : . 150º and 330º
Description : Describe the zero-position of a synchro transmitter.
Last Answer : The transmitter is in its zero-position when the rotor is aligned with the S2 stator winding.
Description : Other than their physical differences, what is the major difference between a TDX and a TDR?
Last Answer : Their application: a TDX has one electrical and one mechanical input with an electrical output.
Description : A synchro has (A) a 3-phase winding on rotor and a single-phase winding on stator. (B) a 3-phase winding on stator and a commutator winding on rotor. (C) a 3-phase winding on stator and a single-phase winding on rotor. (D) a single-phase winding on stator and a commutator winding on rotor.
Last Answer : Ans: C Synchros : The basic synchro unit called a synchro transmitter. It’s construction similar to that of a Three phase alternator.
Description : The rotor of a synchro transmitter: - a) uses a salient pole type of construction b) uses a cylindrical pole type of construction c) may use either salient pole or cylindrical type of construction d) none of the above
Last Answer : The rotor of a synchro transmitter: - uses a salient pole type of construction
Description : Where are the external connections made on standard synchros?
Last Answer : At the terminal board.
Description : . What type of synchro system is used to transmit very large quantities?
Last Answer : A tri-speed synchro system.
Description : In a dual-speed synchro system what determines the two specific speeds at which the data will be transmitted?
Last Answer : The gear ratio between the two transmitters.
Description : What is the most probable cause of trouble in a synchro system that has all of its receivers reading incorrectly?
Last Answer : The transmitter or main bus.
Description : What type of indicator is usually placed in the stator circuit of a torque synchro system?
Last Answer : An overload indicator.
Description : Name two types of trouble you would expect to find in a newly installed synchro system.
Last Answer : Improper wiring and misalignment.
Description : When you zero a multispeed synchro system which synchro should you zero first?
Last Answer : The coarse synchro.
Description : What is the main reason for using a multispeed synchro system instead of a single-speed synchro system?
Last Answer : Greater accuracy without the loss of self-synchronous operation.
Description : What is the name given to the synchro system that transmits data at two different speeds?
Last Answer : . A dual or double-speed synchro system.
Description : In a control synchro system, when is the output of the CT reduced to zero?
Last Answer : When the CX and CT rotors are in correspondence.
Description : What leads in a simple synchro system are connected to the ac power line?
Last Answer : The rotor leads.
Description : What two components make up a simple synchro transmission system?
Last Answer : A synchro transmitter and a synchro receiver.
Description : What is the primary purpose of a synchro system?
Last Answer : Precise and rapid transmission of data between equipment and stations.
Description : The end of the usefulness of a tr tube is indicated by an increase in what quantity?
Last Answer : Recovery time.
Description : In a series-connected duplexer, what tube (tr or atr), if any, fires during the receive cycle?
Last Answer : Neither fires.
Description : During which of the transmit or receive cycles are both the tr and atr tubes of a parallelconnected duplexer ionized (arcing)?
Last Answer : Transmit.
Description : The actions of the tr and atr circuits depend on the impedance characteristics of what length of transmission line?
Last Answer : Quarter-wavelength section
Description : How may the tr tube ionization speed be increased?
Last Answer : Apply keep-alive voltage.
Description : What is the reference point for alignment of all synchro units?
Last Answer : The voltmeter method.
Description : What precaution should you take when substituting a synchro tester in a circuit for a transmitter?
Last Answer : Use only one receiver so as not to overload the tester.
Description : What should you do with a synchro that has a bad set of bearings?
Last Answer : Replace it.
Description : When you zero a synchro with a synchro tester, what is indicated by a jump in the synchro tester's dial when the S1 and S3 leads are momentarily shorted?
Last Answer : The synchro under test is not on electrical zero.
Description : What method of zeroing a synchro is perhaps the fastest but NOT necessarily the most accurate?
Last Answer : . The electrical lock method.
Description : Why should a synchro be rechecked for zero after it is clamped down?
Last Answer : To ensure that it did not move off zero while it was being clamped.
Description : What is the purpose of the coarse setting of a synchro?
Last Answer : .It ensures the synchro is on 0º, not 180º.
Description : Why are synchro capacitors placed physically close to differentials transmitters and CTs?
Last Answer : To keep the connections as short as possible in order to maintain system.
Description : How are synchro capacitors connected in a circuit?
Last Answer : They are delta-connected across the stator windings.
Description : What type of current is eliminated by synchro capacitors?
Last Answer : Magnetizing current.
Description : What type of synchros usually require the use of synchro capacitors?
Last Answer : TDXs, CDXs, and Cts.
Description : What is the purpose of the synchro capacitor?
Last Answer : To improve overall synchro system accuracy by reducing stator currents.
Description : What type of synchro is used in systems requiring large amounts of power and a high degree of accuracy?
Last Answer : A control synchro.
Description : What determines whether a differential synchro adds or subtracts?
Last Answer : The way the differential synchro is connected in a system is the deciding factor on whether the unit adds or subtracts its inputs.
Description : What method is used to prevent oscillations in large synchro units?
Last Answer : Mechanical damping.
Description : What is the physical difference between a synchro transmitter and a synchro receiver?
Last Answer : A synchro receiver uses some form of damping to retard excessive oscillations or spinning.
Description : When will a synchro generate more heat than it is designed to handle?
Last Answer : Synchros have one primary winding that can be turned through 360º and three secondary windings spaced 120º apart.
Description : What unit of measurement refers to the torque of a synchro transmitter
Last Answer : Ounce-inches.
Description : What are the two major components of a synchro?
Last Answer : The rotor and the stator.
Description : Which of the two synchro designation codes is indicated by 5DG on a synchro nameplate?
Last Answer : The Navy prestandard designation code.