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Questions and Answers
The minimum bend radius for an electrical wire bundle is ______ times the outside diameter of the bundle.
The minimum bend radius for an electrical wire bundle is ______ times the outside diameter of the bundle.
Ten
The maximum number of splices permitted between any two connectors in a manufactured harness or installed wiring is ______.
The maximum number of splices permitted between any two connectors in a manufactured harness or installed wiring is ______.
One
AN/MS electrical connectors are specifically designed to meet ______ specifications.
AN/MS electrical connectors are specifically designed to meet ______ specifications.
Military
The most common method of attaching a pin or socket to an individual wire in an MS electrical connector is by ______.
The most common method of attaching a pin or socket to an individual wire in an MS electrical connector is by ______.
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The purpose of selecting ______ switches for continuous load current applications is to obtain reasonable switch efficiency and service life.
The purpose of selecting ______ switches for continuous load current applications is to obtain reasonable switch efficiency and service life.
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The advantage of a ______ is that they are resettable and reusable.
The advantage of a ______ is that they are resettable and reusable.
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The pin section of an AN/MS connector is normally installed on ______ side of a circuit.
The pin section of an AN/MS connector is normally installed on ______ side of a circuit.
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The voltage output of an alternator may be regulated by controlling the ______ of the DC exciter.
The voltage output of an alternator may be regulated by controlling the ______ of the DC exciter.
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A ______ will take an overload for a short period.
A ______ will take an overload for a short period.
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When electric cables pass through holes in bulkheads, wires should be protected from chafing by using a ______.
When electric cables pass through holes in bulkheads, wires should be protected from chafing by using a ______.
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If long lengths of electrical cable are installed in rigid conduit, ______ the cable with powdered soapstone will reduce the possibility of damage during installation.
If long lengths of electrical cable are installed in rigid conduit, ______ the cable with powdered soapstone will reduce the possibility of damage during installation.
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One purpose of grounding is to prevent the development of ______ potentials.
One purpose of grounding is to prevent the development of ______ potentials.
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In aircraft electrical systems, automatic reset circuit breakers should not be used as ______ devices.
In aircraft electrical systems, automatic reset circuit breakers should not be used as ______ devices.
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What is normally used to bond non-continuous stainless steel aircraft components? ______ jumpers.
What is normally used to bond non-continuous stainless steel aircraft components? ______ jumpers.
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The ______ of a switch indicates the number of circuits each pole can complete.
The ______ of a switch indicates the number of circuits each pole can complete.
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When selecting electric cable size, the criteria should be based on ______ carrying capacity and allowable voltage drop.
When selecting electric cable size, the criteria should be based on ______ carrying capacity and allowable voltage drop.
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Aircraft fuse capacity is rated in ______.
Aircraft fuse capacity is rated in ______.
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When adding a rheostat to a light circuit to control the light intensity, it should be connected in ______ with the light.
When adding a rheostat to a light circuit to control the light intensity, it should be connected in ______ with the light.
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An important factor in selecting aircraft fuses is that their ______ matches the needs of the circuit.
An important factor in selecting aircraft fuses is that their ______ matches the needs of the circuit.
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Circuits designed for emergency operation or inadvertent activation that could endanger a system frequently employ ______ switches.
Circuits designed for emergency operation or inadvertent activation that could endanger a system frequently employ ______ switches.
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If one switch controls all navigation lights, the lights are most likely connected ______ to each other and in series with the switch.
If one switch controls all navigation lights, the lights are most likely connected ______ to each other and in series with the switch.
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Oil canning of the sides of aluminum or steel electrical junction boxes is considered to be ______.
Oil canning of the sides of aluminum or steel electrical junction boxes is considered to be ______.
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Electric wiring installed in aircraft without special enclosing means (open wiring) offers the advantages of ease of installation, simple maintenance, and reduced ______.
Electric wiring installed in aircraft without special enclosing means (open wiring) offers the advantages of ease of installation, simple maintenance, and reduced ______.
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When bundling open wiring, the bundles should be limited as to the number of cables to minimize damage from a single electrical ______.
When bundling open wiring, the bundles should be limited as to the number of cables to minimize damage from a single electrical ______.
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During inspection of the terminal strips of an aircraft electrical system, it should be determined that the terminal studs are anchored against ______.
During inspection of the terminal strips of an aircraft electrical system, it should be determined that the terminal studs are anchored against ______.
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Conduit provides ______ protection to wires and cables when used in aircraft installations.
Conduit provides ______ protection to wires and cables when used in aircraft installations.
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When installing aircraft wiring, the bundle should be located ______ flammable fluid lines and securely clamped to the structure.
When installing aircraft wiring, the bundle should be located ______ flammable fluid lines and securely clamped to the structure.
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If the (+) terminal of a voltmeter is connected to the (-) terminal of the source voltage and the (-) terminal of the meter is connected to the (+) terminal of the source voltage, the voltmeter will read ______.
If the (+) terminal of a voltmeter is connected to the (-) terminal of the source voltage and the (-) terminal of the meter is connected to the (+) terminal of the source voltage, the voltmeter will read ______.
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When using the voltage drop method of checking circuit resistance, the input voltage must be maintained at a ______ value.
When using the voltage drop method of checking circuit resistance, the input voltage must be maintained at a ______ value.
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The nominal rating of electrical switches refers to continuous ______ rating with contacts closed.
The nominal rating of electrical switches refers to continuous ______ rating with contacts closed.
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Aircraft electrical junction boxes located in a fire zone are usually constructed of ______ steel.
Aircraft electrical junction boxes located in a fire zone are usually constructed of ______ steel.
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To help minimize radio interference, a capacitor will largely eliminate and provide a steady direct current if the capacitor is connected to the generator in ______.
To help minimize radio interference, a capacitor will largely eliminate and provide a steady direct current if the capacitor is connected to the generator in ______.
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The primary considerations when selecting electric cable size are ______ carrying capacity and allowable voltage drop.
The primary considerations when selecting electric cable size are ______ carrying capacity and allowable voltage drop.
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The navigation lights of some aircraft consist of a single circuit controlled by a single switch which has an ON position and an OFF position, with no additional positions possible. This switch is referred to as a ______ pole ______ throw (SPST), two position switch.
The navigation lights of some aircraft consist of a single circuit controlled by a single switch which has an ON position and an OFF position, with no additional positions possible. This switch is referred to as a ______ pole ______ throw (SPST), two position switch.
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Electric circuits are protected from overheating by means of ______.
Electric circuits are protected from overheating by means of ______.
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How does the routing of coaxial cables differ from the routing of electrical wiring?
How does the routing of coaxial cables differ from the routing of electrical wiring?
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Some electric motors have two sets of field windings wound in opposite directions so that the ______ can be operated in neither direction
Some electric motors have two sets of field windings wound in opposite directions so that the ______ can be operated in neither direction
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The major advantages of alternating current (AC) over direct current (DC) is the fact that its current and voltage can easily be increased or decreased ______ a transformer.
The major advantages of alternating current (AC) over direct current (DC) is the fact that its current and voltage can easily be increased or decreased ______ a transformer.
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One purpose of a growler test is to determine the presence of a ______ armature
One purpose of a growler test is to determine the presence of a ______ armature
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The inductor-type inverter output voltage is controlled by the ______ field current.
The inductor-type inverter output voltage is controlled by the ______ field current.
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Electric wire terminals for most aircraft applications must be what type? ______
Electric wire terminals for most aircraft applications must be what type? ______
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What is the principal advantage of the series-wound dc motor? ______ starting torque
What is the principal advantage of the series-wound dc motor? ______ starting torque
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When using an ohmmeter to check the continuity of a generator field coil, the coil should ______ very low resistance if it is a series field coil.
When using an ohmmeter to check the continuity of a generator field coil, the coil should ______ very low resistance if it is a series field coil.
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If a generator is equipped with a vibrator-type voltage regulator, the actual time the voltage regulator points remain open ______ on the load carried by the generator
If a generator is equipped with a vibrator-type voltage regulator, the actual time the voltage regulator points remain open ______ on the load carried by the generator
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The strength of the core of an electromagnet depends upon the material from which it is constructed and ______ the number of turns of wire in the coil and the amount of current (ampere) passing through the coil.
The strength of the core of an electromagnet depends upon the material from which it is constructed and ______ the number of turns of wire in the coil and the amount of current (ampere) passing through the coil.
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What is a cause of generator brush arcing? ______ spring tension
What is a cause of generator brush arcing? ______ spring tension
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A voltage regulator controls generator voltage by changing the ______ of the generator field circuit.
A voltage regulator controls generator voltage by changing the ______ of the generator field circuit.
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The overvoltage control automatically protects the generator system when excessive voltage is present by ______ the shunt field circuit.
The overvoltage control automatically protects the generator system when excessive voltage is present by ______ the shunt field circuit.
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When ac generators are operated in parallel, the ______ and voltage must be both equal
When ac generators are operated in parallel, the ______ and voltage must be both equal
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The starting current of a series-wound dc motor, in passing through both the field and armature windings, produces a ______ starting torque
The starting current of a series-wound dc motor, in passing through both the field and armature windings, produces a ______ starting torque
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When DC generators are operated in parallel to supply power for a single load, their controls include an equalizer circuit to assure that all generators share the load equally. The equalizer circuit operates by ______ the output of the low generator and decreasing the output of the high generator until they are equal.
When DC generators are operated in parallel to supply power for a single load, their controls include an equalizer circuit to assure that all generators share the load equally. The equalizer circuit operates by ______ the output of the low generator and decreasing the output of the high generator until they are equal.
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The most common method of regulating the voltage output of a compound DC generator is to vary the ______.
The most common method of regulating the voltage output of a compound DC generator is to vary the ______.
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Which motor would be most likely to have an armature brake? ______ light retraction motor
Which motor would be most likely to have an armature brake? ______ light retraction motor
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The method most often used in overcoming the effect of armature reaction is through the use of ______
The method most often used in overcoming the effect of armature reaction is through the use of ______
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The only practical method of maintaining a constant voltage output from an aircraft generator under varying conditions of speed and load is to vary the ______ of the magnetic field
The only practical method of maintaining a constant voltage output from an aircraft generator under varying conditions of speed and load is to vary the ______ of the magnetic field
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The pole pieces or shoes used in a dc generator are a part of the ______ assembly
The pole pieces or shoes used in a dc generator are a part of the ______ assembly
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How many cycles of ac voltage are produced in a six-pole alternator of the revolving-field type for each revolution of the rotor? ______
How many cycles of ac voltage are produced in a six-pole alternator of the revolving-field type for each revolution of the rotor? ______
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If the reverse current cutout relay contact points fail to open after the generator output has dropped below battery potential, current will flow through the generator armature ______ to the normal direction and through the shunt field in the normal direction
If the reverse current cutout relay contact points fail to open after the generator output has dropped below battery potential, current will flow through the generator armature ______ to the normal direction and through the shunt field in the normal direction
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How does the magnetic brake used to stop rotation of an electric motor armature operate? ______
How does the magnetic brake used to stop rotation of an electric motor armature operate? ______
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Real power equals ______ power
Real power equals ______ power
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Generators are rated in amperes and rated ______
Generators are rated in amperes and rated ______
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The poles of a generator are laminated to reduce ______ current losses
The poles of a generator are laminated to reduce ______ current losses
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In troubleshooting, if an ohmmeter reads some value of resistance, the component has ______ and is not open
In troubleshooting, if an ohmmeter reads some value of resistance, the component has ______ and is not open
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CSD driven generators are usually cooled by ______ spray
CSD driven generators are usually cooled by ______ spray
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Study Notes
Aircraft Mechanic Reviewer - Philippines
- Some electric motors have two sets of field windings wound in opposite directions, allowing operation in either direction.
- A growler test is used to detect shorted armatures.
- Electric wire terminals for aircraft applications are typically ring type.
- Series-wound DC motors have a high starting torque as a principal advantage.
- Voltage regulators with vibrator types have operation time dependent on generator load.
- Generator brush arcing is a result of low spring tension.
- AC generators operating in parallel require equal frequency and voltage.
- High starting torque is produced by starting current in series-wound DC motors passing through the field and armature windings.
- Landing light retraction motors commonly use armature brakes.
- Reducing armature reaction is often done using interpoles.
- Aircraft generators maintain constant voltage by varying magnetic field strength.
- DC generator pole pieces are part of the field assembly.
- Six-pole alternators of revolving-field type produce three cycles of AC voltage per rotor revolution.
- Reverse current cutout relay failure allows current flow opposite to normal direction and through the shunt field in a normal direction if battery potential is dropped below.
- Magnetic brakes operate by applying friction using a spring-released magnet.
- Brush pigtails in generators eliminate sparking between brushes and guides.
- Series wound DC motors require more current at lower rotations due to high torque demand.
- Aluminum wires are susceptible to breakage if not stripped carefully.
- Commutators in generators change alternating current to direct current.
- Ammeters in battery systems help monitor charging rate.
- Interpoles prevent armature reaction effects in generators.
- Series, shunt, and compound are the three basic types of DC motors.
- Wiring in series motors connects the field windings in series with the armature winding.
- Crimping is the standard method of attaching wire terminals to aircraft electrical components.
- Factors affecting wire sizing considerations include mechanical strength, allowable power loss, ease of installation, permissible voltage drop, current capacity, and load type.
- Diodes are tested for open or shorted circuits by disconnecting them from the circuit.
- High voltage capacitors should be fully discharged before removal.
- Nickel-cadmium battery thermal runaway is caused by excessive current draw.
- Transformer winding shorts produce heat.
- Main DC motor parts are armature assembly, field assembly, brush assembly, commutator, pole piece, rheostat, and end frame.
- Electrical connections should have a cable to terminal joint strength equal to or greater than the cable's tensile strength.
- Testing for winding shorts relies on using a growler.
- Circuit breakers are installed close to the source to protect circuits against electrical faults.
- Voltmeters are connected in parallel to the load.
- Current limiters are slow-blow fuses primarily used in high-power circuits.
- Moisture-proof connectors should be used for connectors exposed to moisture.
- The three common circuit protections are circuit breakers, fuses, and current limiters.
- Wire installations in proximity to moving parts should be protected using conduit.
- American Wire Gauge (AWG) system defines wire sizes in relation to cross-sectional area.
- Voltage drop calculation formula involves resistance per foot, wire length, and current.
- Staggered wire arrangements are used for wire bundles.
- The minimum bend radius for an electrical wire bundle is ten times its outside diameter.
- Maximum splices are usually one between connectors.
- Military specifications are followed by AN/MS electrical connectors.
- Crimping is the typical method to attach pins or sockets in MS electrical connectors.
- Connectors with pin sections are often installed on the grounded side for circuits.
- Voltage output in alternators is regulated by voltage output control from the DC exciter.
- Using grounded conduit decreases cable damage from installation in rigid conduit.
- Grounding prevents the buildup of electrical noise.
- Copper jumpers are used to bond non-continuous stainless steel components.
- Fuse capacities are measured in amperes.
- Rheostats are used in series for controlling light intensity.
- Circuits requiring emergency or safety-critical operation may use guarded switches.
- Parallel connections are usually used for lights and switches.
- Electric wiring bundled properly minimizes issues in a fault.
- Terminal strip inspections verify terminal stud anchoring to prevent rotation.
- Conduit protects wires from mechanical damage in aircraft installations.
- The voltage drop method's constant input voltage in checking circuit resistance is a critical condition.
- Aircraft electrical junction boxes in fire zones are constructed of stainless steel to resist heat.
- Circuit resistance checking is better performed by keeping input voltage constant.
- Current rating is a critical parameter of electrical switches.
- Wiring and grounding circuits from components should be protected.
- Navigation lights are typically wired with left, right, and rear positions using red, green, and white colors, respectively.
- The depth of the mica insulation between commutator bars is equal to the mica width.
- Circuit breakers in the instrument lighting system prevent excessive current from damaging the wiring.
- AC power in aircraft offers easier voltage increase/decrease via transformer.
- Anti-collision lights can operate independently from position lights.
- Equipment adjustments outside the aircraft are often preferred.
- AC power is preferable for stepped-up or stepped-down voltages in aircraft.
- Eddy currents are reduced in laminated iron cores of induction coils.
- Aircraft batteries are charged by reciprocating rectifiers using alternator AC power for some aircraft.
- A voltmeter in a generator control panel shows residual voltage during engine operation if the system breaks down and is short-circuited.
- Generator field residual magnetism is restored by flashing the fields.
- Inductor-type inverter's output voltage is controlled by DC stator current.
- Generator coils with low resistance indicate continuity if tested with an ohmmeter.
- Electromagnet core strength is related to material type, number of coil windings, and current value.
- Regulators adjust the resistance for the generator's field circuit.
- Generators running in parallel require an equalizer circuit to distribute the load proportionally.
- Maximum intermittent duty circuit operation time is considered two minutes.
- Compound DC generator voltage is adjusted via current flowing through the shunt field circuit.
- Incorrect battery connections are identified by faulty voltage in the system.
- Landing gear extension system issues are identifiable by specific lights staying illuminated during the cycle.
- DC motor rotation reverses with field or armature connections reversed.
- The step-down transformer and rectifier system provides battery power for AC-operated systems.
- In circuits requiring alternating current, an inverter is necessary.
- Rectifiers change AC to DC.
- Troubleshooting electrical systems involves analyzing continuity by using an ohmmeter and determining voltage readings.
- Transformer turns ratio (primary/secondary) is equivalent to input/output voltage ratio.
- Electrical safety measures should always be followed during inspection/maintenance for any part of an aircraft electrical system.
- Generators are rated in amperes and voltages are specified.
- Contamination in the IDG scavenge oil filter is an indication to remove the filter and replace it.
- Generator disconnect is usually controlled through cockpit switches.
- Disconnected CSDs related to malfunctions may require ground-based reconnection.
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Description
Test your knowledge of electrical wiring practices, specifications for connectors, and installation techniques. This quiz covers essential aspects such as minimum bend radius, splicing limits, and switch efficiency related to electrical systems.
