Prime Movers
Aerospace Ground Equipment Journeyman
- 1.(404) To reverse the direction of rotation of a three-phase inductive motor, you must reverse
- A.
All three phases
- B.
Any two power leads
- C.
A and B phases only
- D.
B and C phases only
- 2.(401) What opposes the applied voltage in direct current (DC) motors?
- A.
Couter electromotive force (CEMF)
- B.
Output power
- C.
Horsepower
- D.
Torque
- 3.(403) To operate a single-phase induction motor requires that it has
- A.
Brushes
- B.
Slip rings
- C.
A commutator
- D.
Starting system
- 4.(404)The three-phase induction motor does not require
- A.
Slip
- B.
A rotor
- C.
A stator
- D.
A starting device
- 5.(401) What provides contact between the stationary and rotating parts of a motor?
- A.
Field windings
- B.
Commutator
- C.
Bearings
- D.
Brushes
- 6.(406) During an inspection of a direct current (DC) motor, check the brushes for
- A.
Pitting
- B.
Seating
- C.
Coloration
- D.
Spring pressure
- 7.(403) Which induction motor has the highest starting torque?
- A.
Capacitive-start
- B.
Squirrel-cage
- C.
Shaded-pole
- D.
Split-phase
- 8.(405) The speed of a synchronous motor is controlled by the
- A.
Load
- B.
Torque
- C.
Input frequency
- D.
Armature current
- 9.(406) Which component is one of the major causes of failure in the direct current (DC) motor?
- A.
Commutator
- B.
Slip rings
- C.
Bearings
- D.
Rotor
- 10.(402) In a series-wound direct current (DC) motor, speed is dependent on the
- A.
Load
- B.
Torque
- C.
Armature
- D.
Field winding
- 11.(408) Perform a operational check of the unit
- A.
At the last minute
- B.
With the defective part removed
- C.
Before final reassembly of the enclosure
- D.
As soon as you replace the defective part
- 12.(406) When you check the concentricity of a commutator or slip rings, look for
- A.
Wear
- B.
Pitting
- C.
Roundness
- D.
Overheating
- 13.(407) Which of the following is not listed in a troubleshooting chart?
- A.
Analysis
- B.
Remedies
- C.
Symptoms
- D.
Probable causes
- 14.(409) What controls the amount of fuel injected when constant-stroke fuel injection pumps are used?
- A.
Injector
- B.
Control rack
- C.
Delivery valve
- D.
Revolving disk
- 15.(407) When you troubleshoot a motor, you should first perform a
- A.
Voltage check
- B.
Continuity test
- C.
Visual inspection
- D.
Current measurement
- 16.(407) You can do most troubleshooting on a motor by using a
- A.
Megger
- B.
Growler
- C.
Multimeter
- D.
Clamp-on ammeter
- 17.(408) When you clean motors, the component most likely to be damaged by cleaning solvents is the
- A.
Brushes
- B.
Bearings
- C.
Slip rings
- D.
Commutator
- 18.(410) A lubricant performs which function when it deposits particles of dirt in the oil sump?
- A.
Cooling
- B.
Sealing
- C.
Cleaning
- D.
Reducing friction
- 19.(410) Which function does a lubricant perform by constantly circulating past the air that surrounds the oil sump?
- A.
Cooling
- B.
Sealing
- C.
Cleaning
- D.
Reducing friction
- 20.(408) In component removal, if wires are to be soldered, do not
- A.
Cut tem, but remove the wiring intact
- B.
Resolder them until they have been bench checked
- C.
Resolder them until all wiring has been replaced with new wires
- D.
Cut them unless there is a sufficient length remaining for resoldering
- 21.(409) What kind of pumps are injection pumps also called?
- A.
Control
- B.
Metering
- C.
Pressure
- D.
Mechanical
- 22.(415) What is the allowable deviation between cylinders during a compression test?
- A.
25 psi
- B.
50 psi
- C.
75 psi
- D.
100 psi
- 23.(410) When a lubricant reduces friction, it also reduces
- A.
Heat
- B.
Wear
- C.
Resistance
- D.
All of the above
- 24.(409) What is used on the constant-stroke pump plunger to determine the amount of fuel that is delivered?
- A.
Bypass port
- B.
Vertical slot
- C.
Helical groove
- D.
Delivery valve
- 25.(424) Common or frequently occurring troubles in a unit, their causes, and remedies may be found in the
- A.
Historical record
- B.
Maintenance record
- C.
Troubleshooting chart
- D.
Illustrated parts breakdown
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