Description : What unit of measurement refers to the torque of a synchro transmitter
Last Answer : Ounce-inches.
Description : What is the difference between a torque synchro and a control synchro?
Last Answer : A torque synchro is used for light loads and a control synchro is used in systems desired to move heavy loads.
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 : What type of synchros usually require the use of synchro capacitors?
Last Answer : TDXs, CDXs, and Cts.
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 : 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 : How are synchro capacitors connected in a circuit?
Last Answer : They are delta-connected across the stator windings.
Description : . What type of synchro system is used to transmit very large quantities?
Last Answer : A tri-speed synchro system.
Description : What type of current is eliminated by synchro capacitors?
Last Answer : Magnetizing current.
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 : 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 : 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 : In a TDX system with standard synchro connections, the TX rotor is at 120º and the TDX rotor is at 40º. What position will the TR indicate?
Last Answer : . 80º.
Description : What is the primary purpose of a synchro system?
Last Answer : Precise and rapid transmission of data between equipment and stations.
Description : What is the reference point for alignment of all synchro units?
Last Answer : The voltmeter method.
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 : 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 purpose of the coarse setting of a synchro?
Last Answer : .It ensures the synchro is on 0º, not 180º.
Description : What is the purpose of the synchro capacitor?
Last Answer : To improve overall synchro system accuracy by reducing stator currents.
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 : 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 : 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 are the two major components of a synchro?
Last Answer : The rotor and the stator.
Description : On the synchro schematic symbol, what indicates the angular displacement of the rotor?
Last Answer : . The position of the arrow.
Description : Which of the two synchro designation codes is indicated by 5DG on a synchro nameplate?
Last Answer : The Navy prestandard designation code.
Description : What does the code 26V-11TX4D mean on a synchro nameplate?
Last Answer : It is the third modification of a 26-volt 400-hertz (torque) synchro transmitter whose body diameter is between 1.01 and 1.10 inches
Description : Name the two general classifications of synchro systems
Last Answer : Torque and control.
Description : Which of the following statements describes what will occur if the motor shown in the illustration is required to carry 150% of full load? EL-0056 A. The primary counter emf will be increased. B. ... slip will decrease. D. The slip value, stator current curve, and torque curve will all coincide.
Last Answer : Answer: B
Description : The torque and current curves for a three-phase induction motor with a cage rotor, are shown in the illustration. Which of the following statements is true concerning the depicted curves? EL-0056 A. As slip ... D. If the motor is loaded to the point where 40% slip has resulted, it will stall.
Last Answer : Answer: D
Description : Which of the following is a characteristic of fractional horsepower repulsion start motors? A. They start with a rotating stator field. B. The short circuiting ring is removed from the commutator while ... brushes are removed from the commutator while starting. D. They have a low starting torque.
Description : Regarding an induction motor, the power developed by the rotor automatically adjusts itself to the _____________. A. power required to drive the load B. speed required to drive the load C. current flow in the motor stator D. torque developed by the rotating field
Last Answer : Answer: A
Description : The torque produced by a motor when its shaft will not turn, even though rated voltage is applied to the stator, is known as _____________. A. locked-rotor torque B. pullout torque C. breakdown torque D. torque margin
Description : A circuit has a source voltage of 100 volts and two 50-ohm resistors connected in series. If the reference point for this circuit is placed between the two resistors, what would be the voltage at the reference point?
Last Answer : 50 volts.
Description : What three things prevent a CT rotor from turning when voltages are applied to its stator windings?
Last Answer : The rotor is specially wound, it is never connected to an ac supply, and its output is always applied to a high-impedance load.
Description : What is the relationship between the transmitter and receiver stator voltages when their rotors are in correspondence?
Last Answer : The voltages are equal and oppose each other.
Description : . What three factors determine the amplitude of the voltage induced into a stator winding?
Last Answer : The amplitude of the primary voltage, the turns ratio, and the angular displacement between the rotor and the stator winding.
Description : When is the maximum voltage induced into a stator coil?
Last Answer : When the rotor coil is aligned with the stator coil.
Description : How does the stator receive its voltage?
Last Answer : By the magnetic coupling from the rotor