133777

  1. 1. Shunt wound DC motor vary their speed by:



    D) varying the resistance of the field windings
  2. 2. What are two types of AC motors that are used to produce a relatively high torque? A. Shaded pole and shunt field_B. Shunt field and single phase_C. Three phase induction and capacitor start_D. Synchronous and series field.
    C. Three phase induction and capacitor start
  3. 3. What is used to engage the starter motor to the engine using a knurled drum (continental worm gear) starter system? :_A. A sprag clutch that used the centrifugal force of the starter to engage it_B. Nothing, because with the worm gear design it can remain engaged_C. Spring type clutch that tightens when driven by the starter_D. The directional rotation of the starter shaft drives the pinion gear along a helical spline, throwing it into the ring gear.
    C. Spring type clutch that tightens when driven by the starter
  4. 4. A shunt wound DC motor A. maintains a nearly constant speed under varying loads B. will change its speed depending upon the load applied to it C. requires a separate starting circuit D. is used where high starting torque is required
    A. maintains a nearly constant speed under varying loads
  5. 5. Large engine starters found on radial engines A. are high capacity three phase AC motors B. use a worm gear arrangements to provide the necessary high torque C. are permanently engaged to the engine D. use a clutch to prevent the motor from spinning an engine with hydraulic lock
    D. use a clutch to prevent the motor from spinning an engine with hydraulic lock
  6. 6. Split phase motors
    • A. use a centrifugal switch to disconnect the start windings B. have a second starting winding with a very low resistance C. are compound wound D. will overspeed without a load.
    • A. use a centrifugal switch to disconnect the start windings
  7. 7. A shaded pole motor. A. is a three phase AC motor B. uses a capacitor in its starting circuit C. is used where very high torque is required D. operates on single phase AC
    D. operates on single phase AC
  8. 8. High starting torque even under load is developed by some DC motors. This type of start motor is usually a A. shunt-wound motorB. Squirrel cage motorC. a combined shunt and series wound motor for durabilityD. series-wound motor
    D. series-wound motor
  9. 9. Series wound DC motors A. are used where a constant speed is required B. can overspeed if power is applied to it when no load is present C. use a starting capacitor in series with the field D. do no use any brushes
    B. can overspeed if power is applied to it when no load is present
  10. 10. Aircraft engine starter motors are generally which type? A. Compound B. Series C. Shunt (parallel) D. Induction
    B. Series
  11. 11. Three phase induction motors A. require a seperate starting motor B. are self starting C. use a capacitor to offset the phase during the run sequence D. have a centrifugal switch included in their construction
    B. are self starting
  12. 12. The Bendix starter drive A. uses a drive spring to prevent the sudden application of torque when the pinion gear engages the starter ring from damaging the starter B. disengages when the engine throws the pinion gear (starter drive gear) back C. the directional rotation of the starter shaft drives the pinion gear along a helical spline, throwing it into the ring gear D. all of the above
    D. all of the above
  13. 13. The rotor of an induction motor A. is not electrically connected to the stator B. is wound in series with the armature C. is a high resistance field coil D. runs at the same speed as the phase change in the armature
    A. is not electrically connected to the stator
  14. 14. Motor slip. A. is an undesirable condition indicating motor inefficiency B. occurs as the load on the motor becomes excessive C. is a measurement of copper and iron losses D. is a percent of motor speed and is required for proper operation
  15. 15. If the drive spring breaks on a starter equipped with a Bendix drive,
    • A. the motor would operate without driving the pinion
    • B. the motor would remain engaged after the engine is started
    • C. the starter would not be energized
    • D. the pinion would drive the flywheel at a slower rate
  16. 16. What type of electric motor is generally used with a direct-cranking starter?
    • A. Direct current, shunt wound motor
    • B. Direct current, series wound motor
    • C. Synchronous motor
    • D. Induction motor
  17. 17. On a small engine starter operated with a shift lever,
    • A. the motor energizes when the pinion gear engages the starter gear
    • B. the pilot pulls the shift lever after the inertial flywheel has spun up
    • C. the pinion gear meshes to the starter gear first, then the motor is energized
    • D. the overrunning clutch engages the pinion to the starter gear when the motor begins spinning
  18. 18. The starter dog of an electric inertia starter is commonly engaged by the use od
    • A. a solenoid of pull cable
    • B. a foot pedal
    • C. a cartridge
    • D. a hand crank
  19. 19. On a large engine starter, the motor is geared to a sun gear through a set of reduction gears. The sun gear
    • A. drives the starter jaw
    • B. drives the planetary gear assembly which drives the starter jaw assembly
    • C. is permanently engaged to the engine through the sprag clutch
    • D. is an idler gear in the reduction assembly
  20. 20. How many of the following statements are true?
    • A. the starter used on Lycoming engines with a large diameter ring gear have an overrunning clutch to disengage the starter when the engine starter
    • B. A Bendix drive is used to increase starter torque
    • A. Both false
    • B. Both true
    • C. A true, B false
    • D. A false, B true
  21. 21. The overrunning clutch on a small engine starter
    • A. slips when the load becomes too great
    • B. freewheels the pinion gear with the engine immediate after engine start
    • C. retracts the pinion gear from the engine after engine start
    • D. prevents damage to the engine in the event of hydraulic lock
  22. 22. Corroded commutators should be cleaned with
    • A. steel wool
    • B. emery paper
    • C. fine sandpaper
    • D. diamond files
  23. 23. DC motors change direction by
    • A. changing current flow direction in the field
    • B. changing current flow direction in the armature
    • C. either of the above
    • D. neither of the above
  24. 24. A certain direct current series motor mounted within an aircraft draws more amperes during start than when it is running under its rated load. The most logical conclusion that may be drawn is
    • A. The starting winding is shorted
    • B. the brushes are floating at operating RPM because of weak brush springs
    • C. The armature is shorted to the motor housing
    • D. The condition is normal for this type of motor
  25. 25. Capacitor-start motors
    • A. use a centrifugal switch that cuts out when the motor reaches its rated speed
    • B. are three phase type induction motors
    • C. use reactance to develop a phase shift in one pair of windings
    • D. require the use of an auxiliary motor to get started
Author
pokedex01
ID
338419
Card Set
133777
Description
ckasdlfjasdf
Updated