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CDC 2A652N - Volume 3 - Prime Movers and Generation

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CDC 2A652N - Volume 3 - Prime Movers and Generation
nicilynn1981
Quiz by nicilynn1981, updated more than 1 year ago
nicilynn1981
Created by nicilynn1981 over 8 years ago
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Resource summary

Question 1

Question
To change electrical energy to mechanical energy is the purpose of a
Answer
  • Generator
  • Converter
  • Inverter
  • Motor

Question 2

Question
Electrical contact between the stationary and rotating parts of a motor is the function of the
Answer
  • Field windings
  • Commutator
  • Bearings
  • Brushes

Question 3

Question
Torque is defined as
Answer
  • Wattage
  • Horsepower
  • Rotational force
  • Opposition to applied voltage

Question 4

Question
In a series-wound direct current (DC) motor, speed is dependent on the
Answer
  • Load
  • Torque
  • Armature
  • Field winding

Question 5

Question
The relationship between slip and torque can best be described as more
Answer
  • Torque causing more slip
  • Slip causing more torque
  • Torque causing less slip
  • Slip causing less torque

Question 6

Question
The three-phase induction motor does not require
Answer
  • Slip
  • A rotor
  • A stator
  • A starting device

Question 7

Question
To reverse the direction of rotation of a three-phase inductive motor, you must reverse
Answer
  • All three phases
  • Any two power leads
  • A and B phases only
  • B and C phases only

Question 8

Question
The stator windings of a synchronous motor are spaced
Answer
  • 20 degrees apart
  • 30 degrees apart
  • 90 degrees apart
  • 120 degrees apart

Question 9

Question
The rotation speed of a synchronous motor is controlled by the
Answer
  • Load
  • Torque
  • Input frequency
  • Armature current

Question 10

Question
During an inspection of a direct current (DC) motor, check the brushes for
Answer
  • Pitting
  • Seating
  • Coloration
  • Brittleness

Question 11

Question
When you check the concentricity of a commutator or slip rings, look for
Answer
  • Wear
  • Pitting
  • Roundness
  • Overheating

Question 12

Question
When using a troubleshooting chart, what are you not likely to find?
Answer
  • Analysis
  • Remedies
  • Symptoms
  • Probable causes

Question 13

Question
Most troubleshooting on a motor can be done using a
Answer
  • Megger
  • Growler
  • Multimeter
  • Clamp-on ammeter

Question 14

Question
Perform an operational check of the unit
Answer
  • At the last minute
  • With the defective part removed
  • Before final reassembly of the enclosure
  • As soon as you replace the defective part

Question 15

Question
The component most likely to be damaged by poorly filtered fuel is the
Answer
  • Combustion chamber
  • Transfer pump
  • Fuel lines
  • Injectors

Question 16

Question
The type of injector that is operated by a rocker arm is
Answer
  • Spray
  • Pintle
  • Pressure
  • Mechanical

Question 17

Question
Aside from idle speed, the limiting speed governor through the use of flyweights and spring tension controls
Answer
  • Load speed
  • Minimum speed
  • Maximum speed
  • Intermediate speed

Question 18

Question
A lubricant performs which function when it deposits particles of dirt in the oil sump?
Answer
  • Cooling
  • Sealing
  • Cleaning
  • Reducing friction

Question 19

Question
What component holds a large amount of coolant in close contact with a large volume of air?
Answer
  • Radiator cap
  • Thermostat
  • Water pump
  • Radiator

Question 20

Question
Which liquid cooling system component circulates the coolant?
Answer
  • Vacuum valve
  • Water pump
  • Cooling fan
  • Radiator

Question 21

Question
One of the impellers within a blower on a diesel engine is normally driven
Answer
  • 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

Question 22

Question
What must be accomplished to supercharge a diesel engine?
Answer
  • 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

Question 23

Question
The filtration step protects the diesel engine fuel system from
Answer
  • Blockage of airflow
  • Lube system malfunctions
  • Slipping belts on the blower
  • Abrasion by foreign particles

Question 24

Question
The best step in preventing abnormal amounts of carbon, moisture, and sludge buildup in a diesel engine, is to
Answer
  • 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

Question 25

Question
When performing a compression test, measuring pounds per square inch (psi), the maximum allowable deviation between cylinders is
Answer
  • 25 psi
  • 50 psi
  • 75 psi
  • 100 psi

Question 26

Question
If the drive shaft for the oil pump assembly in a gas turbine engine becomes sheared, what other component is rendered inoperative?
Answer
  • Alternating current (AC) generator
  • Tachometer generator
  • Starter motor
  • Cooling fan

Question 27

Question
In the gas turbine engine, cooling air for the transformer rectifier is provided by the
Answer
  • Cooling fan
  • Starter motor
  • Fuel pump and control unit
  • Multiple centrifugal switch assembly

Question 28

Question
During gas turbine engine operation, the air is accelerated by the
Answer
  • Diffusers
  • Exducers
  • Impellers
  • Deswirl ring

Question 29

Question
During operation of a turbine engine, fuel and air are mixed and ignited in the
Answer
  • Fuel atomizer
  • Combustor can
  • Mixer assembly
  • Plenum chamber

Question 30

Question
In the operation of a turbine engine, energy is extracted from the burning gases by the
Answer
  • Diffuser
  • Exhaust flange
  • Turbine wheel and exducer
  • Exhaust gas thermocouple

Question 31

Question
The boost pump on the gas turbine engine provides fuel to the
Answer
  • Fuel atomizer
  • Main fuel pump
  • Combustion chamber
  • Fuel air mixture valve

Question 32

Question
Lubrication system pressure in the turbine engine is regulated through a
Answer
  • Flow check valve
  • Filter bypass valve
  • Pressure relief valve
  • Temperature regulator

Question 33

Question
Gas turbine compressor (GTC) operation with insufficient oil pressure is prevented by the
Answer
  • Oil pressure solenoid
  • Oil pressure switch
  • Oil drain switch
  • Ignition coil

Question 34

Question
During turbine engine operation, oil loss into the airflow system is prevented by the
Answer
  • Air-oil seals
  • Oil tank baffles
  • Exhaust vent line
  • Pressure relief valve

Question 35

Question
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?
Answer
  • Excessive exhaust gas temperature
  • Maladjusted rate adjustment screw
  • Ruptured actuator diaphragm
  • Defective relief valve

Question 36

Question
In the turbine engine, rupture of the rate diaphragm is prevented by the
Answer
  • Adjustment screw
  • Actuator regulator
  • Rate metering valve
  • Rate diaphragm return spring

Question 37

Question
Prior to operating any aerospace ground equipment (AGE), you should perform
Answer
  • A preoperational inspection
  • A serviceability check
  • A periodic inspection
  • An operational test

Question 38

Question
During a preoperational inspection of a gas turbine engine, you check the intake and exhaust for
Answer
  • Leakage
  • Excess heat
  • Hairline cracks
  • Foreign objects

Question 39

Question
Normal acceleration characteristics of the gas turbine compressor (GTC) include
Answer
  • Sudden rumbling noises after 35 percent
  • A decrease in vibration after 35 percent
  • Smooth and quiet acceleration
  • Burping

Question 40

Question
Before you load and after you unload the gas turbine compressor (GTC), allow the engine to operate unloaded to
Answer
  • Decrease noise
  • Allow for flameouts
  • Reduce thermal stress
  • Allow for positioning of the service hose

Question 41

Question
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?
Answer
  • Analysis
  • Isolation
  • Recognition
  • Verification

Question 42

Question
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
Answer
  • 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

Question 43

Question
If no oil pressure is available from the main oil pump assembly on the gas turbine compressor (GTC), you should replace the
Answer
  • Oil pump
  • Entire assembly
  • Flow check valve
  • Filter bypass relief valve

Question 44

Question
Which causes gray or white smoke to pour from the exhaust stack on the gas turbine compressor (GTC)?
Answer
  • Excessive engine revolutions per minute (rpm)
  • Excessive engine exhaust temperature
  • Oil that enters the airflow system
  • Fuel mixing with the airflow

Question 45

Question
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
Answer
  • Main oil pump
  • Scavenge pump
  • Oil tank vent line
  • Oil drain solenoid

Question 46

Question
Which could cause the butterfly valve to oscillate (continually open and close)?
Answer
  • Load valve
  • Hose relief valve
  • Rate adjustment screw
  • Pneumatic load thermostat

Question 47

Question
Which three things are necessary to produce an electromotive force (EMF) mechanically?
Answer
  • 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

Question 48

Question
To increase the output of a generator, you must increase the
Answer
  • Load
  • Resistance of the conductor
  • Strength of the magnetic field
  • Counter-electromotive force (CEMF)

Question 49

Question
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?
Answer
  • Increased output and almost constant alternating current (AC)
  • Increased output and almost constant DC
  • Decreased current and constant AC
  • Decreased current and constant DC

Question 50

Question
The rotor of an alternating current (AC) generator consists of the slip rings and
Answer
  • Armature
  • Starter coil
  • Stator windings
  • Voltage regulator

Question 51

Question
Control of the output voltage of an alternating current (AC) generator is accomplished by varying the
Answer
  • Speed of rotation
  • Size of the armature
  • Amount of field current
  • Size of the field windings

Question 52

Question
In an alternating current (AC) generator, the output frequency is often more critical than the output
Answer
  • Load
  • Phase
  • Current
  • Voltage

Question 53

Question
In a three-phase alternating current (AC) generator, direct current (DC) is applied to the field windings through the brushes and
Answer
  • Diodes
  • Rectifier
  • Slip rings
  • Commutator

Question 54

Question
Three different loads can be supported at the same time by a
Answer
  • Direct current (DC) generator
  • Single-phase generator
  • Two-phase generator
  • Three-phase generator

Question 55

Question
The self-excited alternating current (AC) generator provides its own field current from a built-in
Answer
  • Direct current (DC) generator
  • Selenium rectifier
  • Battery source
  • Regulator

Question 56

Question
When a load is applied to a self-excited alternating current (AC) generator, exciter field resistance will
Answer
  • Decrease current flow
  • Remain the same
  • Increase
  • Decrease

Question 57

Question
The weak points of the self-excited alternating current (AC) generator are the
Answer
  • Commutator, brushes, and slip rings
  • Commutator, rotor, and slip rings
  • Brushes, commutator, and rotor
  • Brushes, slip rings, and rotor

Question 58

Question
In the brushless alternating current (AC) generator, what provides necessary excitation current?
Answer
  • Main generator
  • Exciter generator
  • Armature windings
  • Permanent magnet generator

Question 59

Question
What type of loads can be applied to a generator under test by the A/M24T–8 electrical test set?
Answer
  • Inductive and resistive
  • Reactive and resistive
  • Inductive only
  • Resistive only

Question 60

Question
The A/M24T–8 electrical test set is capable of testing
Answer
  • Aerospace ground equipment (AGE) generator sets only
  • Alternating current (AC) power supplies only
  • Direct current (DC) power supplies only
  • AC and DC power supplies

Question 61

Question
What circuit on the A/M24T–8 load bank is used to check the performance of three-phase alternators?
Answer
  • Special checks
  • Impedance load
  • Aircraft servicing
  • Jet engine servicing

Question 62

Question
What occurs when the load selection switches on the A/M24T–8 load bank are closed?
Answer
  • Load elements are connected to neutral
  • Blower motors begin operation
  • Panel lights illuminate
  • Link boards rearrange

Question 63

Question
Before connecting a generator set to the load bank, you should
Answer
  • 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

Question 64

Question
When using a load bank to test a generator, follow the procedures outlined in the
Answer
  • 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

Question 65

Question
When using an A/M24T–8 electrical test set, when should the frequency and voltage selector switch be positioned to match input power?
Answer
  • 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

Question 66

Question
What maximum alternating current (AC) resistive load can the portable load bank apply to a generator?
Answer
  • 65 kilowatts
  • 70 kilowatts
  • 75 kilowatts
  • 80 kilowatts

Question 67

Question
When performing a phase-one periodic inspection (PE), you are going to do a
Answer
  • 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

Question 68

Question
The resistive elements on the A/M24T–8 test set are best cleaned by
Answer
  • Blowing off with 5 pounds per square inch (psi) uncontaminated air
  • Blowing off with 15 psi uncontaminated air
  • Scrubbing with soap and water
  • Steam cleaning

Question 69

Question
On an A/M24T–8 electrical test set, what would prevent the fan motors from operating?
Answer
  • Shorted fuses
  • Defective wind switch
  • CB1 stuck in the ON position
  • Defective power supply rectifier

Question 70

Question
The governor of the A/M32A–60A generator set is controlled directly by the
Answer
  • Engine speed
  • Trim control motor
  • Static frequency sensor
  • Manual trim adjustment

Question 71

Question
What is used as a reference for controlling A/M32A–60A engine speed?
Answer
  • Fuel pressure
  • Control air pressure
  • Governor flyweight pressure
  • Alternating current (AC) generator output frequency

Question 72

Question
If the oil pressure switch opens during operation of A/M32A–60A, during which period does it stop operation?
Answer
  • From 0 to 35 percent
  • From 35 to 95 percent
  • From 95 to 100 percent
  • Anytime during operation

Question 73

Question
On the A/M32A–60A, which chambers of the load control valve work together to ensure the butterfly valve opens smoothly?
Answer
  • 1 and 2
  • 2 and 3
  • 1 and 3
  • 2 and 4

Question 74

Question
Power for starting the A/M32A–60A is provided by
Answer
  • Batteries
  • Generator
  • Start Switch
  • Master Switch

Question 75

Question
In the event of an overspeed condition, what component of the A/M32A–60A generator electrical system stops the engine?
Answer
  • Overspeed actuator
  • Fuel shutoff switch
  • 35 percent centrifugal switch
  • 110 percent centrifugal switch

Question 76

Question
The A/M32A–60A generator set cannot be loaded either electrically or pneumatically until after the
Answer
  • 35 percent switch has closed
  • 95 percent switch has closed
  • 110 percent switch has opened
  • BLEED AIR ON switch is closed

Question 77

Question
The component of the A/M32A–60A that opens and closes the fuel transfer line is the fuel
Answer
  • Level switch, S20
  • Solenoid valve, L1
  • Level control relay, K26
  • Level solenoid valve, L4

Question 78

Question
After the A/M32A–60A generator set has shut itself down due to low fuel, the fuel level relay, K4, must be reset by
Answer
  • 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

Question 79

Question
What does the alternating current (AC) voltage regulator of the A/M32A–60A use to determine the amount of adjustment the generator output needs?
Answer
  • AC ammeter
  • AC voltmeter
  • Generator output current
  • Generator output voltage

Question 80

Question
When is 28 volts direct current (VDC) applied to E pin of the alternating current (AC) cable?
Answer
  • Never
  • At all times
  • When the AC cable switch is in the GEN position
  • When the AC cable switch is in the ACFT position

Question 81

Question
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?
Answer
  • Battery charging resistor
  • Battery charging diode
  • Voltage regulator
  • Charging shunt

Question 82

Question
On the A/M32A–60A, when the direct current (DC) contactor is in the closed position, the DC ammeter indicates
Answer
  • Power through the DC power receptacle
  • Alternating current (AC) load
  • Battery charging current
  • Nothing

Question 83

Question
How often are service inspections required?
Answer
  • After equipment is placed on the ready line
  • After maintenance
  • Once a week
  • Once a day

Question 84

Question
After the A/M32A–60A generator set has reached 95 percent of governed speed, the operator should
Answer
  • Reset the alternating current (AC) system
  • Connect the power cables
  • Adjust the governed speed
  • Connect the bleed air duct

Question 85

Question
When troubleshooting, the actual location of a terminal connection on the unit can best be found by using
Answer
  • The wiring diagram
  • Your past experience
  • The schematic diagram
  • The reference designation

Question 86

Question
To find out where a wire is connected, you should consult the
Answer
  • Flow chart
  • Wiring diagram
  • Schematic diagram
  • Reference designation list

Question 87

Question
What component of the A/M32A–86D energizes to send power to the fuel gauge during operation?
Answer
  • Hourmeter, M4
  • Oil pressure switch, S46
  • Oil pressure switch, S53
  • Fuel oil pressure switch, S48

Question 88

Question
What is the purpose of the protective circuits of the A/M32A–86D?
Answer
  • 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

Question 89

Question
How long can you operate the starter on the A/M32A–86D before letting it cool?
Answer
  • 60 seconds
  • 30 seconds
  • 20 seconds
  • 10 seconds

Question 90

Question
When troubleshooting any electrical system, you can locate a starting point by first finding the
Answer
  • Common ground bus.
  • Main circuit breaker.
  • External power source
  • Last known source of power

Question 91

Question
What position must the alarm switch on the EPU–6/E frequency converter be placed prior to operation?
Answer
  • On
  • Off
  • Activate
  • Inactive

Question 92

Question
What indicator on the EPU–6/E frequency converter indicates an under voltage condition?
Answer
  • Overvoltage
  • Out-of-phase
  • Undervoltage
  • Fault

Question 93

Question
What component on the EPU–6/E frequency converter controls the timing and firing of the silicon controlled rectifier (SCR)?
Answer
  • Analog board
  • Control transformer
  • SCR voltage regulator
  • Phase sequence transformer

Question 94

Question
Before using the EPU–6/E frequency converter, you must inspect the
Answer
  • Air inlets for blockage
  • Wiring for secure mounting
  • Maintenance panels for corrosion
  • Interior air vents for secure mounting

Question 95

Question
What problem is indicated by a flashing red over/under voltage indicator light on the EPU– 6/E frequency converter?
Answer
  • Out-of-phase relationship
  • Output overvoltage
  • Loss-of-input phase
  • Input under voltage

Question 96

Question
What printed circuit (PC) card controls the cold-starting aid on the B809A generator set?
Answer
  • Direct current (DC)
  • Annunciator
  • Regulator
  • Engine

Question 97

Question
What signal powers the regulator card output pulse sent to the exciter field of the B809A generator?
Answer
  • 200 volts alternating current (VAC)
  • 110 volts direct current (VDC)
  • 28.5 VDC
  • 115 VAC

Question 98

Question
What condition is sensed by the direct current (DC) card on the B809A generator set?
Answer
  • Over temperature
  • Under frequency
  • Over frequency
  • Low fuel

Question 99

Question
During high-voltage operation of the B809A generator set, what action occurs to prevent the direct current (DC) contactors from closing?
Answer
  • High sense relay (HSR) energizes
  • Interlock (INT) relay energizes
  • INT relay de-energizes
  • HSR de-energizes

Question 100

Question
If you have a loss of residual magnetism in the exciter field poles, what should you do
Answer
  • Connect TB4–11 to 14 VDC power source
  • Check the Field Transformer
  • Field flash the generator
  • Check the fault display
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