Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
NAVEDTRA 14187A
SYNCHROS, SERVOS, GYROS CH1, 3 ET2 BIBS MAR 2017
| Question | Answer |
|---|---|
| Which name is given to a variety of rotary, electromechanical, position-sensing devices? | synchro |
| Which principle does a synchro run on? | electromagnetic induction |
| Synchros are used primarily for the rapid and accurate transmission of what between equipment and stations? | information |
| What are the two general classifications of synchro systems? | torque and control |
| Which type of synchros are used in systems that are designed to move heavy loads such as gun directors, radar antennas, and missile launchers? | control |
| Which two broad categories can the synchros used in the Navy be grouped into? | Military standard and Prestandard Navy |
| How many symbols meet the standard military specifications for schematic diagrams of synchros and synchro connections? | five |
| What are the two common types of synchro rotors in use? | salient-pole and drum/wound |
| Which part of a synchro is a cylindrical structure of slotted laminations on which three Y-connected coils are wound with their axes 120 degrees apart? | stator |
| What is a measure of how much load a machine can turn? | torque |
| Which unit of measurement are torque synchro measurements in? | ounce-inches |
| What is the measurement of work? | foot-pounds |
| The strength of the magnetic field produced by what determines the torque? | stator |
| Military standard and Navy prestandard synchros are designed to operate on either 115v or how many volts? | 26v |
| Synchros used in shipboard equipment are designed predominantly for how many volts? | 115v |
| How many volts do most aircraft synchros operate on? | 26v |
| Which frequency are synchros designed to operate on? | 60 or 400Hz |
| What is the most widely used frequency for airborne equipment? | 400Hz |
| Standard synchros are designed to withstand surrounding temperatures ranging from -67 F to what at the terminal board? | +257F |
| Prestandard synchros operate in a range of -13F to what temperature? | +185F |
| To meet military specifications, all standard synchros must be capable of continuous operation for 1,000 hours at how many revolutions per min (rpm) without a load? | 1200 rpm |
| Low-speed prestandard synchros must be capable of continuous operation for how many hours at 300 rpm without a load? | 500 hours |
| Low-speed pretandard synchros must be capable of continuous operation for 1,500 hours at what rpm without a load? | 1200 rpm |
| Which type of transmitter converts the angular position of its rotor (mechanical input) into an electrical output signal? | synchro torque |
| What is the common stepdown between the rotor and a single coil? | 2.2:1 |
| When stator voltages are measured, reference is always made to what voltages instead of a single coil's voltage? | terminal-to-terminal |
| Synchro torque receivers, commonly called synchro receivers, are electrically identical to torque transmitters of the same size except for the addition of some form of what? | damping |
| What are the two types of damping methods? | electrical and mechanical |
| Which condition exists when both transmitter and receiver rotors in a synchro system are on zero or displaced from zero by the same angle? | correspondence |
| What is the angle called through which a transmitter rotor is mechanically rotated? | signal |
| What is necessary to determine the actual position of the synchros rotor? | labeling |
| When large amounts of power and a higher degree of accuracy are required, as in the movement of heavy radar antennas and gun turrets, torque sychro systems give way to the use of what type of synchros? | control synchro |
| What is a control synchro device accurately governing some type of power amplifying device used for moving heavy equipment? | control transformer |
| Which control transformer (CT) windings are considered to be the primary windings? | stator windings |
| `Which type of simple system should the synchro capacitor never be used in? | transmitter-receiver |
| Data that covers a wide range of values are handled very effectively and still maintain a high degree of accuracy in what type of synchro system? | multispeed |
| The advent of long-range missiles and high-speed aircraft has brought about the need for accurately transmitting very large quantities. This is best done by what type of synchro system? | tri-speed |
| What is the reference point for alignment of all synchro units? | electrical zero |
| What is the most accurate method of zeroing a synchro? | AC voltmeter |
| How many conditions must exist for a control transformer (CT) to be on electrical zero? | two |
| What is perhaps the fastest method of zeroing a synchro? | electrical lock |
| What are used primarily for quickly locating defective synchros? | snychro testers |
| Which method is used in synchro receivers to prevent the rotor from oscillating or spinning? | damping |
| What is a low voltage used in multispeed synchro systems that contain CTs to prevent false synchronizations? | stickoff voltage |
| Which signal lights are used to aid maintenance personnel in locating synchro trouble quickly? | trouble indicators |
| The earth spins about its polar axis at over how many mph at the equator? | 1000 mph |
| Which type of mechanical device contains a spinning mass that is universally mounted? | gyroscope |
| Which two basic properties do gyroscopes have? | rigidity and precession |
| Which gyro property relates to the axis of rotation having a tendency to turn at a right angle to the direction of an applied force? | precession |
| What is the ability of a gyro to keep its axis fixed in space called? | rigidity |
| Which devices permit the rotor to assume any position and retain that position when the support is tipped or repositioned? | gimbals |
| What is the strength with which a gyro resists any external force that would tilt its rotor spin axis? | gyro rigidity |
| How many factors determine gyro rigidity? | three |
| Precession is the result of which two forces? | angular momentum and torque |
| Which term is an indication of the number of axes about which the rotor is free to process? | degrees of freedom |
| A gyro mounted in two gimbals has how many degrees of freedom? | two |
| What is the effect of the earth's rotation on a gyro sometimes called? | apparent drift |
| How many general sources of mechanical drift are there? | three |
| What are used in weapons control equipment, aircraft instrumentation, inertial navigation, and in many other applications to detect and measure angular rates of change? | rate gyros |
| Which type of device gives an indication, usually in the form of a voltage, that is proportional to the acceleration to which it is subjected? | accelerometer |
| Which property is the operation of an accelerometer based on? | inertia |
| Which one of Newton's laws states that "when a body is acted on y force, its resulting acceleration is directly proportional to the force and inversely proportional to the mass of the body."? | 2nd |
| What are accelerometers principally used in? | inertial navigation system |
Created by:
nng7294
Popular Military sets