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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
- 26.(410) Which of the four functions of a lubricant compensates for tiny scratches in the cylinder wall?
- A.
Cooling
- B.
Sealing
- C.
Cleaning
- D.
Reducing friction
- 27.(411) What component holds a large amount of coolant in close contact with a large volume of air?
- A.
Radiator cap
- B.
Thermostat
- C.
Water pump
- D.
Radiator
- 28.(411) Which liquid cooling system component maintains positive pressure within the cooling system, causes the boiling point of the coolant to be higher, and permits the engine to operate at higher temperature without the coolant boiling?
- A.
Thermostat
- B.
Water pump
- C.
Radiator cap
- D.
Vacuum valve
- 29.(411) Which liquid cooling system component circulates the coolant?
- A.
Radiator
- B.
Water pump
- C.
Cooling fan
- D.
Vacuum valve
- 30.(415) When you remove an engine from a unit, what steps should you take to prevent a fire hazard when you disconnect fuel lines?
- A.
Mark all wiring
- B.
Disconnect the intake air duct
- C.
Keep several rags near the unit for spill clean-up
- D.
Disconnect the battery and close the fuel shutoff valve
- 31.(411) The purpose of the cooling syestem thermostat is to maintain correct engine
- A.
Operating temperature
- B.
Coolant temperature
- C.
System pressure
- D.
Coolant flow
- 32.(402) In large universal motors, reactance losses are compensated for by
- A.
A reactance winding
- B.
An auxiliary winding
- C.
An auxiliary armature
- D.
A reactance compensator
- 33.(412) A blower on a diesel engine is normally driven
- A.
By the engine electrical system through a DC motor
- B.
By the engine exhaust gases flowing across the turbine wheel
- C.
From the engine crankshaft through a system of gears or chains
- D.
Through a solid shaft connected between the blower and transmission
- 34.(413) The maintenance procedure that is considered to be the cheapest and most effective means of reducing equipment problems and maintenance cost is
- A.
Correct defective components only
- B.
Rigid maintenance schedules
- C.
Periodic overhaul schedule
- D.
Preventive maintenance
- 35.(413) You should protect diesel engine fuel systems from
- A.
Blockage of airflow
- B.
Lube system malfunctions
- C.
Slipping belts on the blower
- D.
Abrasion by foreign particles
- 36.(414) To prevent abnormal amounts of carbon, moisture, and sludge build-up in a diesel engine,
- A.
Avoid operation the engine for extended periods at no-load
- B.
Operate the unit at idle speed for long periods of time
- C.
Drain moisture from fuel system periodically
- D.
Perform a preoperational check
- 37.(416) What is the key to purification of used coolant?
- A.
The removal of water from the coolant
- B.
The removal of total dissolved solids
- C.
The production of clean, drinkable water
- D.
The production of impurities in the coolant mixture
- 38.(412) What is the advantage of using a turbocharger on a diesel engine?
- A.
Fuel consumption is increased and the horsepower rating of the engine is decreased
- B.
Fuel consumption is increased because of the better mixing of the fuel with the air charge.
- C.
Fuel consumption is decreased because of the increased internal operating temperature of the engine
- D.
Fuel is burned more efficiently and horsepower is increased
- 39.(419) The two pressure controls in the fuel pump and control unit of the turbine engine are the
- A.
Governor and pneumatic control device
- B.
Acceleration limiter valve and governor
- C.
Fuel solenoid valve and pneumatic control device
- D.
Acceleration limiter valve and fuel solenoid valve
- 40.(419) Which gas turbine compressor (GTC) systems control the fuel solenoid for the delivery of fuel to the atomizer?
- A.
Lubrication and electrical
- B.
Lubrication and cooling
- C.
Air and lubrication
- D.
Air and electrical
- 41.(417) The cooling fan in the gas turbine engine provides cooling air for the
- A.
Starter motor
- B.
Transformer retifier
- C.
Fuel pump and control unit
- D.
Multiple centrifugal switch assembly
- 42.(418) In the gas turbine engine, the air is accelerated by the
- A.
Impellers
- B.
Diffusers
- C.
Exducers
- D.
Deswirl ring
- 43.(418) In the turbine engine, fuel and air are mixed and the fuel is ignited in the
- A.
Fuel atomizer
- B.
Plenum chamber
- C.
Mixer assembly
- D.
Combustor can
- 44.(418) The component to the gas turbine engine that extracts energy from the burning gases is the
- A.
Inducer
- B.
Diffuser
- C.
Turbine wheel
- D.
Torque converter
- 45.(417) What is used on the turbine engine to reduce engine speed for the operation of accessory components?
- A.
Gearcase
- B.
Starter motor
- C.
Tachometer generator
- D.
Multiple centrifugal switch assembly
- 46.(419) The purpose of the boost pump on the gas turbine engine is to provide fuel to the
- A.
Fuel atomizer
- B.
Main fuel pump
- C.
Combustion chamber
- D.
Fuel air mixture valve
- 47.(418) The component of the gas turbine engine that changes the velocity of the air to pressure is the
- A.
Nozzle ring
- B.
Turbine wheel
- C.
Torus assembly
- D.
Divergent diffuser
- 48.(419) In the gas turbine compressor (GTC), the engine's constant speed is maintained by the
- A.
Governor
- B.
Fuel regulator
- C.
Acceleration limiter valve
- D.
Acceleration stabilizer solenoid
- 49.(419) Which turbine engine fuel system component is normally closed and is energized open when the engine builds up sufficient oil?
- A.
Governor
- B.
Boost pump
- C.
Oil shutoff valve
- D.
Fuel shutoff solenoid valve
- 50.(419) Which turbine engine fuel system component prevents fuel from accumulating in the plenum?
- A.
Atomizer
- B.
Drain valve
- C.
Pneumatic control device
- D.
Acceleration limiter valve
- 51.(421) Pressure in the lubrication system of the turbine engine is regulated by the oil
- A.
Flow check valve
- B.
Filter bypass valve
- C.
Pressure relief valve
- D.
Temperature regulator
- 52.(420) In the gas turbine compressor (GTC), engine operation with insufficient oil pressure is prevented by the
- A.
Oil pressure solenoid
- B.
Oil pressure switch
- C.
Oil drain switch
- D.
Ignition coil
- 53.(421) In the gas turbine compressor (GTC), the supply of high volume, low pressure air to the aircraft is controlled by the
- A.
Bleed air system
- B.
Airflow regulator
- C.
Electrical system
- D.
Pressure regulator
- 54.(421) The load section of the load control valve consist of
- A.
Chambers 1 and 2
- B.
Chambers 2 and 3
- C.
Chambers 3 and 4
- D.
Chambers 1 and 4
- 55.(421) The time required to open the load control valve on the turbine engine is controlled by the
- A.
Actuator diaphragm
- B.
Mechanical linkage
- C.
Rate adjustment screw
- D.
Actuator return spring
- 56.(421) If the gas turbine compressor (GTC) load control valve opened too slowly or snapped open, what is the most probable cause of malfunction?
- A.
Excessive exhaust gas temperature
- B.
Maladjusted rate adjustment screw
- C.
Ruptured actuator diaphragm
- D.
Defective relief valve
- 57.(426) In the gas turbine compressor (GTC) load control valve (assume the electrical system is okay), what component would most probably be at fault if the valve failed to open?
- A.
Relief valve
- B.
Actuator diaphragm
- C.
Rate adjustment screw
- D.
Rate control diaphragm
- 58.(422) During a preoperational inspection of a gas turbine engine, you check the intake and exhaust for
- A.
Leakage
- B.
Excess heat
- C.
Hairline cracks
- D.
Foreign objects
- 59.(425) What causes gray or white smoke to pour from the exhaust stack on the gas turbine compressor?
- A.
Excessive engine RPM
- B.
Fuel mixing with the airflow
- C.
Oil that enters the airflow system
- D.
Excessive engine exhaust temperature
- 60.(425) While troubleshooting the gas turbine compressor (GTC), you find no oil pressure and te oil filter is dirty. Will changing the filter correct the problem?
- A.
Yes, the filter blocked oil flow.
- B.
No, the filter bypass valve is stuck open.
- C.
No, the oil pressure relief valve is stuck open.
- D.
No, the scavenge pump is not providing sufficient suction.
- 61.(425) In the gas turbine compressor (GTC), if large amounts of oil are vented overboard during shutdown, the most probable cause is defective
- A.
Main oil pump
- B.
Scavenge pump
- C.
Oil tank vent line
- D.
Oil drain solenoid
- 62.(423) Before you load and after you unload the gas turbine compressor (GTC), allow the engine to operate unloaded to
- A.
Decrease noise
- B.
Allow for flameouts
- C.
Reduce thermal stress
- D.
Allow for positioning of the service hose
- 63.(423) When you operate a gas turbine engine, you should
- A.
Use earplugs and muffs
- B.
Never enter the plane of rotation
- C.
Stay away from the rear of the engine
- D.
All of the above
- 64.(423) Normal acceleration characteristics of the gas turbine compressor (GTC) include
- A.
A decrease in vibration after 35 percent
- B.
Sudden rumbling noises after 35 percent
- C.
Smooth and quiet acceleration
- D.
Burping
- 65.(426) What could cause the butterfly valve to oscillate (continually open and close)?
- A.
Load valve
- B.
Hose relief valve
- C.
Pneumatic thermostat
- D.
Rate adjustment screw
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