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ATT TEST 11 EXAM LATEST 2025 100 QUESTIONS AND
VERIFIED ANSWERS ALREADY GRADED A.
What are two types of controllers used by DC motors? - CORRECT ANSWER>>Amplitude and Time control What are 3 types of AC motors? - CORRECT ANSWER>>Universal, induction, synchronous Which AC motor is used for large HP or special applications? - CORRECT ANSWER>>Synchronous hat is a motor - CORRECT ANSWER>>a device that converts electrical energy into mechanical energy What is a generator - CORRECT ANSWER>>a device that converts mechanical energy into electrical energy What is an incremental motor - CORRECT ANSWER>>a motor whose shaft rotates a specific distance in degrees What is a continuous motor - CORRECT ANSWER>>one whose shaft continuously rotates without interruption when input is applied What type of generator produces DC volts and uses a commutator? - CORRECT ANSWER>>Dynamo Motors and generators operate on what principle? - CORRECT ANSWER>>Electromagnetism What characteristic describes how fast shaft rotates and is measured in RPM/RPS? - CORRECT ANSWER>>Speed What characteristic is a twisting force that causes shaft to rotate? - CORRECT ANSWER>>Torque How is torque calculated in generators? - CORRECT ANSWER>>Force X Distance from center of shaft
How are torque and speed related? - CORRECT ANSWER>>Inversely proportional What characteristic is a generated voltage that OPPOSES applied volts? - CORRECT ANSWER>>Couterelectromotive Force (CEMF) How is CEMF produced? - CORRECT ANSWER>>By the rotation of motors shaft How is CEMF related to speed and torque? - CORRECT ANSWER>>CEMF is proportional to speed and inversely proportional to torque What are loads? - CORRECT ANSWER>>items that require motion and are driven by rotating shaft (motors) and electrical circuits that require power (generators) How are loads related to speed? - CORRECT ANSWER>>Inversely proportional What characteristic is the amount of work accomplished? - CORRECT ANSWER>>power How is power calculated in motors? - CORRECT ANSWER>>torque X RPM X K How is power measured? - CORRECT ANSWER>>Watts and HP How is power related to load and speed? - CORRECT ANSWER>>Proportional to load and inversely proportional to speed When is torque greatest? - CORRECT ANSWER>>When RPM is 0 (locked motor) How much CEMF is generated in locked motor condition? - CORRECT ANSWER>>None What is the definition of one horsepower? - CORRECT ANSWER>>Power needed to lift 550 lbs 1 foot in one second or (33000 lbs in one minute) What principle of magnetism do motors operate on? - CORRECT ANSWER>>Attraction/repulsion What are basic parts of a motor? - CORRECT ANSWER>>Stator, armature (rotor), brushes, commutator, shaft At what points are max flux lines cut and peak volts produced? - CORRECT ANSWER>>When
What is used to measure motion? - CORRECT ANSWER>>velocity How are acceleration and deceleration calculated? - CORRECT ANSWER>>change in velocity divided by change in time Acceleration and deceleration are both changes in what? - CORRECT ANSWER>>Velocity Constant and changing velocity both equal what type of motion? - CORRECT ANSWER>>Linear motion What are two main factors of circular motion? - CORRECT ANSWER>>Rotational motion and runout What is runout? - CORRECT ANSWER>>distance traveled from point on circumference in given time period What is a measure of velocity of rotating point - CORRECT ANSWER>>Runout How is runout rate (ROR) calculated? - CORRECT ANSWER>>RPM X 2PIR (circumference) How is total runout distance calculated? - CORRECT ANSWER>>ROR X T Circular motion of point A will cause _____ motion of plate A - CORRECT ANSWER>>Linear Linear motion is equal to circular motion in terms of what? - CORRECT ANSWER>>Velocity, acceleration, distance Fixed RPM causes varying ROR and ROD depending on what? - CORRECT ANSWER>>Circumference In circular motion, V out is proportional to what? - CORRECT ANSWER>>Acceleration What are 3 popular motion sensors? - CORRECT ANSWER>>Photo interrupter, photo reflector, magnetic pickup What do position generators do? - CORRECT ANSWER>>cause a change in position, use electrical input to produce mechanical output
What do position sensors do? - CORRECT ANSWER>>detect changes in position, use mechanical input to produce an electrical output Which position device rotates from one position to another according to digital/analog input? - CORRECT ANSWER>>Position generators Which position device receives mechanical input and produces analog/digital signal output? - CORRECT ANSWER>>Position sensor Define position - CORRECT ANSWER>>location of object, defined in 1, 2, or 3 dimensions in respect to reference Torque and RPM depend on the _____ of the shaft - CORRECT ANSWER>>Radius What constant is used in power calculations when HP need to be converted to FT-LBS?
- CORRECT ANSWER>>9.55 (Torque X RPM)/9. What constant is used in power calculations when HP need to be converted to ft-lbs? - CORRECT ANSWER>>5252.5 (Torque X RPM)/5252. What are two types of resolvers? - CORRECT ANSWER>>Induction and resistance Resolvers use what type of motion? - CORRECT ANSWER>>Circular An induction resolver acts like which component? - CORRECT ANSWER>>Transformer Resistance resolvers are specifically designed _____? - CORRECT ANSWER>>Potentiometers What are two types of digital position sensors? - CORRECT ANSWER>>Increment and wheel The shaft of which digital position sensor must return to 0 prior to each move - CORRECT ANSWER>>Increment wheel Which digital position sensor would have 4 sensors? - CORRECT ANSWER>>Encoder wheel (gray or 8421)
Rotor is secondary AC induction motor has _____ start torque - CORRECT ANSWER>>SMALL What is the purpose of synchros? - CORRECT ANSWER>>To transfer angular information as voltage Define synchros - CORRECT ANSWER>>rotary electromechanical position sensing devices, movement of one device produces voltage that causes movement in another device What are two main parts of synchro? - CORRECT ANSWER>>Stator and rotor How many stators does synchro use? - CORRECT ANSWER>>3 windings in Y config What does TX stand for? - CORRECT ANSWER>>Torque transmitter What does TDX stand for? - CORRECT ANSWER>>Torque differential transmitter What does the torque receiver do? - CORRECT ANSWER>>Electronically forced to reposition in response to applied voltage (from transmitter), provides mechanical motion What control component is similar to torque receiver? - CORRECT ANSWER>>Control transformer What are 4 steps of troubleshooting synchro systems? - CORRECT ANSWER>>Confirm symptom, remove power, isolate components, locate defect What is a multimeter used to measure when troubleshooting synchros? - CORRECT ANSWER>>Ohms What fault will cause blown fuses or tripped circuit breaker? - CORRECT ANSWER>>Short rotor What fault causes transmitter to have little effect, receivers attempt to track, and low torque? - CORRECT ANSWER>>Open rotor An open in transmitter rotor will affect one device or whole system? - CORRECT ANSWER>>Whole system
What fault causes all devices to point toward good stator axis? - CORRECT ANSWER>>Short stator A short stator in receiver will affect one device or whole system? - CORRECT ANSWER>>Whole system Define gyroscope? - CORRECT ANSWER>>mechanical device containing spinning mass that is universally mounted What gyroscope principle causes wheel to remain in fixed position if no force is applied?
- CORRECT ANSWER>>Rigidity What principle of gyroscopes causes spin axis to turn at right angle to angle of applied force? - CORRECT ANSWER>>Precession What factors affect rigidity? - CORRECT ANSWER>>Rotor weight and speed, and rotor shape (weight distribution) Larger diameter of rotor equals (more/less) rigidity? - CORRECT ANSWER>>More Rate of precession is proportional to what? - CORRECT ANSWER>>Applied force
