To change electrical energy to mechanical energy is the purpose of a
Electrical contact between the stationary and rotating parts of a motor is the function of the
Torque is defined as
Opposition to applied voltage
In a series-wound direct current (DC) motor, speed is dependent on the
The relationship between slip and torque can best be described as more
Torque causing more slip
Slip causing more torque
Torque causing less slip
Slip causing less torque
The three-phase induction motor does not require
A starting device
To reverse the direction of rotation of a three-phase inductive motor, you must reverse
All three phases
Any two power leads
A and B phases only
B and C phases only
The stator windings of a synchronous motor are spaced
20 degrees apart
30 degrees apart
90 degrees apart
120 degrees apart
The rotation speed of a synchronous motor is controlled by the
During an inspection of a direct current (DC) motor, check the brushes for
When you check the concentricity of a commutator or slip rings, look for
When using a troubleshooting chart, what are you not likely to find?
Most troubleshooting on a motor can be done using a
Perform an operational check of the unit
At the last minute
With the defective part removed
Before final reassembly of the enclosure
As soon as you replace the defective part
The component most likely to be damaged by poorly filtered fuel is the
The type of injector that is operated by a rocker arm is
Aside from idle speed, the limiting speed governor through the use of flyweights and spring tension controls
A lubricant performs which function when it deposits particles of dirt in the oil sump?
What component holds a large amount of coolant in close contact with a large volume of air?
Which liquid cooling system component circulates the coolant?
One of the impellers within a blower on a diesel engine is normally driven
By the engine electrical system through a DC motor
By the engine exhaust gases flowing across the turbine wheel
From the engine crankshaft through a system of gears or a silent chain
Through a solid shaft connected between the blower and the transmission
What must be accomplished to supercharge a diesel engine?
Change the overlap and timing so that the intake and exhaust valves are not open at the same time.
Change the overlap and timing so that the intake and exhaust valves are open at the same time.
Advance exhaust valve opening time
Retard intake valve opening time
The filtration step protects the diesel engine fuel system from
Blockage of airflow
Lube system malfunctions
Slipping belts on the blower
Abrasion by foreign particles
The best step in preventing abnormal amounts of carbon, moisture, and sludge buildup in a diesel engine, is to
Avoid operating the engine for extended periods at no-load
Operate the unit at idle speed for long periods of time
Drain moisture from fuel system periodically
Perform a preoperational check
When performing a compression test, measuring pounds per square inch (psi), the maximum allowable deviation between cylinders is
If the drive shaft for the oil pump assembly in a gas turbine engine becomes sheared, what other component is rendered inoperative?
Alternating current (AC) generator
In the gas turbine engine, cooling air for the transformer rectifier is provided by the
Fuel pump and control unit
Multiple centrifugal switch assembly
During gas turbine engine operation, the air is accelerated by the
During operation of a turbine engine, fuel and air are mixed and ignited in the
In the operation of a turbine engine, energy is extracted from the burning gases by the
Turbine wheel and exducer
Exhaust gas thermocouple
The boost pump on the gas turbine engine provides fuel to the
Main fuel pump
Fuel air mixture valve
Lubrication system pressure in the turbine engine is regulated through a
Flow check valve
Filter bypass valve
Pressure relief valve
Gas turbine compressor (GTC) operation with insufficient oil pressure is prevented by the
Oil pressure solenoid
Oil pressure switch
Oil drain switch
During turbine engine operation, oil loss into the airflow system is prevented by the
Oil tank baffles
Exhaust vent line
If the gas turbine compressor (GTC) load control butterfly valve opens too slowly or too quickly, what is the most probable cause of the malfunction?
Excessive exhaust gas temperature
Maladjusted rate adjustment screw
Ruptured actuator diaphragm
Defective relief valve
In the turbine engine, rupture of the rate diaphragm is prevented by the
Rate metering valve
Rate diaphragm return spring
Prior to operating any aerospace ground equipment (AGE), you should perform
A preoperational inspection
A serviceability check
A periodic inspection
An operational test
During a preoperational inspection of a gas turbine engine, you check the intake and exhaust for
Normal acceleration characteristics of the gas turbine compressor (GTC) include
Sudden rumbling noises after 35 percent
A decrease in vibration after 35 percent
Smooth and quiet acceleration
Before you load and after you unload the gas turbine compressor (GTC), allow the engine to operate unloaded to
Allow for flameouts
Reduce thermal stress
Allow for positioning of the service hose
When you operate a unit to determine the validity of an entry on the maintenance record form, what step in effective troubleshooting are you performing?
While troubleshooting the gas turbine compressor (GTC), if you discover there is no oil pressure and the oil filter is dirty, changing the oil filter will not correct the problem because the
Filter bypass valve is stuck open
Oil pressure relief valve is stuck open
Externally mounted solenoid is stuck closed
Scavenge pump is not providing sufficient suction
If no oil pressure is available from the main oil pump assembly on the gas turbine compressor (GTC), you should replace the
Filter bypass relief valve
Which causes gray or white smoke to pour from the exhaust stack on the gas turbine compressor (GTC)?
Excessive engine revolutions per minute (rpm)
Excessive engine exhaust temperature
Oil that enters the airflow system
Fuel mixing with the airflow
In the gas turbine compressor (GTC), if large amounts of oil are forced through the air-oil seals, the most probable cause is a defective
Main oil pump
Oil tank vent line
Oil drain solenoid
Which could cause the butterfly valve to oscillate (continually open and close)?
Hose relief valve
Rate adjustment screw
Pneumatic load thermostat
Which three things are necessary to produce an electromotive force (EMF) mechanically?
EMF, relative motion, and magnetic field
Magnet, lines of force, and relative motion
Magnetic field, a conductor, and relative motion
Counter-electromotive force (CEMF), a conductor, and magnetic field
To increase the output of a generator, you must increase the
Resistance of the conductor
Strength of the magnetic field
Counter-electromotive force (CEMF)
What result is achieved by replacing the single rotating conductor of a simple direct current (DC) generator with many coils of wire wound on the same shaft?
Increased output and almost constant alternating current (AC)
Increased output and almost constant DC
Decreased current and constant AC
Decreased current and constant DC
The rotor of an alternating current (AC) generator consists of the slip rings and
Control of the output voltage of an alternating current (AC) generator is accomplished by varying the
Speed of rotation
Size of the armature
Amount of field current
Size of the field windings
In an alternating current (AC) generator, the output frequency is often more critical than the output
In a three-phase alternating current (AC) generator, direct current (DC) is applied to the field windings through the brushes and
Three different loads can be supported at the same time by a
Direct current (DC) generator
The self-excited alternating current (AC) generator provides its own field current from a built-in
When a load is applied to a self-excited alternating current (AC) generator, exciter field resistance will
Decrease current flow
Remain the same
The weak points of the self-excited alternating current (AC) generator are the
Commutator, brushes, and slip rings
Commutator, rotor, and slip rings
Brushes, commutator, and rotor
Brushes, slip rings, and rotor
In the brushless alternating current (AC) generator, what provides necessary excitation current?
Permanent magnet generator
What type of loads can be applied to a generator under test by the A/M24T–8 electrical test set?
Inductive and resistive
Reactive and resistive
The A/M24T–8 electrical test set is capable of testing
Aerospace ground equipment (AGE) generator sets only
Alternating current (AC) power supplies only
Direct current (DC) power supplies only
AC and DC power supplies
What circuit on the A/M24T–8 load bank is used to check the performance of three-phase alternators?
Jet engine servicing
What occurs when the load selection switches on the A/M24T–8 load bank are closed?
Load elements are connected to neutral
Blower motors begin operation
Panel lights illuminate
Link boards rearrange
Before connecting a generator set to the load bank, you should
Make sure input power cables are energized
Make sure all on-off switches are in the OFF position
Close the direct current (DC) section cooling fan doors
Place circuit breaker three-phase shock load to ON position
When using a load bank to test a generator, follow the procedures outlined in the
Generator technical order (TO) and career development course (CDC)
Load bank TO, generator TO, and CDC
Generator TO and load bank TO
Load bank TO and CDC
When using an A/M24T–8 electrical test set, when should the frequency and voltage selector switch be positioned to match input power?
While applying power to the test set
Before applying power to the test set
After the ABC indicator is illuminated
After the 28 volts direct current (VDC) control signal indicator illuminates
What maximum alternating current (AC) resistive load can the portable load bank apply to a generator?
When performing a phase-one periodic inspection (PE), you are going to do a
Detailed annual inspection
Relatively quick equipment condition check
Special inspection accomplishing the lubrication requirements only
Streamline inspection to ensure a unit is operational and serviceable
The resistive elements on the A/M24T–8 test set are best cleaned by
Blowing off with 5 pounds per square inch (psi) uncontaminated air
Blowing off with 15 psi uncontaminated air
Scrubbing with soap and water
On an A/M24T–8 electrical test set, what would prevent the fan motors from operating?
Defective wind switch
CB1 stuck in the ON position
Defective power supply rectifier
The governor of the A/M32A–60A generator set is controlled directly by the
Trim control motor
Static frequency sensor
Manual trim adjustment
What is used as a reference for controlling A/M32A–60A engine speed?
Control air pressure
Governor flyweight pressure
Alternating current (AC) generator output frequency
If the oil pressure switch opens during operation of A/M32A–60A, during which period does it stop operation?
From 0 to 35 percent
From 35 to 95 percent
From 95 to 100 percent
Anytime during operation
On the A/M32A–60A, which chambers of the load control valve work together to ensure the butterfly valve opens smoothly?
1 and 2
2 and 3
1 and 3
2 and 4
Power for starting the A/M32A–60A is provided by
In the event of an overspeed condition, what component of the A/M32A–60A generator electrical system stops the engine?
Fuel shutoff switch
35 percent centrifugal switch
110 percent centrifugal switch
The A/M32A–60A generator set cannot be loaded either electrically or pneumatically until after the
35 percent switch has closed
95 percent switch has closed
110 percent switch has opened
BLEED AIR ON switch is closed
The component of the A/M32A–60A that opens and closes the fuel transfer line is the fuel
Level switch, S20
Solenoid valve, L1
Level control relay, K26
Level solenoid valve, L4
After the A/M32A–60A generator set has shut itself down due to low fuel, the fuel level relay, K4, must be reset by
Turning the start switch OFF, then ON
Turning the master switch OFF, then ON
De-energizing the low-level lockout relay
De-energizing the low-level warning switch
What does the alternating current (AC) voltage regulator of the A/M32A–60A use to determine the amount of adjustment the generator output needs?
Generator output current
Generator output voltage
When is 28 volts direct current (VDC) applied to E pin of the alternating current (AC) cable?
At all times
When the AC cable switch is in the GEN position
When the AC cable switch is in the ACFT position
On the A/M32A–60A generator, what stops battery charging when the batteries are fully charged and prevents discharge when the unit is shut down?
Battery charging resistor
Battery charging diode
On the A/M32A–60A, when the direct current (DC) contactor is in the closed position, the DC ammeter indicates
Power through the DC power receptacle
Alternating current (AC) load
Battery charging current
How often are service inspections required?
After equipment is placed on the ready line
Once a week
Once a day
After the A/M32A–60A generator set has reached 95 percent of governed speed, the operator should
Reset the alternating current (AC) system
Connect the power cables
Adjust the governed speed
Connect the bleed air duct
When troubleshooting, the actual location of a terminal connection on the unit can best be found by using
The wiring diagram
Your past experience
The schematic diagram
The reference designation
To find out where a wire is connected, you should consult the
Reference designation list
What component of the A/M32A–86D energizes to send power to the fuel gauge during operation?
Oil pressure switch, S46
Oil pressure switch, S53
Fuel oil pressure switch, S48
What is the purpose of the protective circuits of the A/M32A–86D?
Protects the generator electrical system against damage resulting from an overload, overvoltage, under voltage, and over/under frequency
Protects the aircraft electrical system against damage resulting from an overload, overvoltage, under voltage, and over/under frequency
Senses fault conditions, stopping the generator
Senses fault conditions, stopping the engine
How long can you operate the starter on the A/M32A–86D before letting it cool?
When troubleshooting any electrical system, you can locate a starting point by first finding the
Common ground bus.
Main circuit breaker.
External power source
Last known source of power
What position must the alarm switch on the EPU–6/E frequency converter be placed prior to operation?
What indicator on the EPU–6/E frequency converter indicates an under voltage condition?
What component on the EPU–6/E frequency converter controls the timing and firing of the silicon controlled rectifier (SCR)?
SCR voltage regulator
Phase sequence transformer
Before using the EPU–6/E frequency converter, you must inspect the
Air inlets for blockage
Wiring for secure mounting
Maintenance panels for corrosion
Interior air vents for secure mounting
What problem is indicated by a flashing red over/under voltage indicator light on the EPU– 6/E frequency converter?
Input under voltage
What printed circuit (PC) card controls the cold-starting aid on the B809A generator set?
Direct current (DC)
What signal powers the regulator card output pulse sent to the exciter field of the B809A generator?
200 volts alternating current (VAC)
110 volts direct current (VDC)
What condition is sensed by the direct current (DC) card on the B809A generator set?
During high-voltage operation of the B809A generator set, what action occurs to prevent the direct current (DC) contactors from closing?
High sense relay (HSR) energizes
Interlock (INT) relay energizes
INT relay de-energizes
If you have a loss of residual magnetism in the exciter field poles, what should you do
Connect TB4–11 to 14 VDC power source
Check the Field Transformer
Field flash the generator
Check the fault display