7.7 Electrical Wiring (EWIS) Flashcards
What is continuity in electrical wiring?
A. The condition of being unbroken or uninterrupted.
B. The condition of having a high resistance.
C. The condition of excessive current flow.
A. The condition of being unbroken or uninterrupted.
Good continuity has a low resistance pathway
What is the purpose of bonding in electrical wiring systems?
A. To ensure components have the same potential (or resistance) to ground and to prevent parallel paths for current flow.
B. To increase the voltage in the system.
C. To reduce the weight of the electrical wiring system.
A. To ensure components have the same potential (or resistance) to ground and to prevent parallel paths for current flow.
What is the purpose of the white tool in plastic insertion/removal?
A. For removal.
B. For insertion.
C. For both removal and insertion.
A. For removal.
What is the purpose of the color tool in plastic insertion/removal?
A. For removal.
B. For insertion.
C. For both removal and insertion.
B. For insertion.
What is the ideal length of a co-axial cable?
A. As long as possible to reduce resistance.
B. As direct and as short as possible to minimize Radio Frequency Interference (RFI) hazards.
C. As long as possible to maximize power efficiency.
B. As direct and as short as possible to minimize Radio Frequency Interference (RFI) hazards.
What is the required bend radius for a co-axial cable?
A. Four times the diameter of the cable.
B. Six times the diameter of the cable.
C. Ten times the diameter of the cable.
B. Six times the diameter of the cable.
How often must a co-axial cable be supported?
A. At a minimum of 61 cm (24 in) intervals.
B. At a minimum of 30 cm (12 in) intervals.
C. At a minimum of 120 cm (48 in) intervals.
A. At a minimum of 61 cm (24 in) intervals.
What causes copper losses in co-axial cables?
A. Power loss from resistance and skin effect.
B. Loss due to electromagnetic interference.
C. Loss from insulation breakdown.
A. Power loss from resistance and skin effect.
What causes dielectric loss in co-axial cables?
A. Heating of the dielectric material (insulation) between the conductors.
B. Power loss from resistance.
C. Friction between the conductor and insulation.
A. Heating of the dielectric material (insulation) between the conductors.
What is the minimum bend radius for wire groups or bundles?
A. 5 times the outside diameter of the largest wire or cable.
B. 10 times the outside diameter of the largest wire or cable.
C. 15 times the outside diameter of the largest wire or cable.
B. 10 times the outside diameter of the largest wire or cable.
What is the minimum bend radius for thermocouple cables?
A. 10 times the diameter of the cable.
B. 15 times the diameter of the cable.
C. 20 times the diameter of the cable.
C. 20 times the diameter of the cable.
What is the minimum bend radius for RF cables?
A. 4 times the diameter of the cable.
B. 6 times the diameter of the cable.
C. 8 times the diameter of the cable.
B. 6 times the diameter of the cable.
What is the duration of fire resistance for fire-resistant cables?
A) 10 minutes
B) 5 minutes
C) 15 minutes
B) 5 minutes
What is the key difference between fire-resistant and fireproof cables?
A) Fire-resistant cables last 15 minutes, while fireproof cables last 5 minutes
B) Fire-resistant cables last 5 minutes, while fireproof cables last 15 minutes
C) Both fire-resistant and fireproof cables last 10 minutes
B) Fire-resistant cables last 5 minutes, while fireproof cables last 15 minutes
Where are fireproof cables typically used?
A) In general wiring
B) In critical fire zones
C) In low-temperature areas
B) In critical fire zones
What is the maximum distance the loom must be tied on either side of a wire bundle breakout?
A) 1 cm
B) 5 cm
C) 2.5 cm
C) 2.5 cm
Which of the following are the three types of inspections defined by regulatory authorities?
A) Stand‐alone General Visual Inspections (GVI), Detailed (DET) inspections, Zonal Inspections
B) Basic Visual Inspections (BVI), Structural Inspections, Routine Maintenance Inspections
C) External Inspections, Internal Inspections, Functional Inspections
A) Stand‐alone General Visual Inspections (GVI), Detailed (DET) inspections, Zonal Inspections
Which of the following are the three areas reviewed in the inspection requirements?
A) Levels of inspection applicable to EWIS, Guidance for performing zonal inspections, Installations and areas of concern
B) Aircraft performance standards, Aircraft power systems, Structural integrity assessments
C) Routine maintenance schedules, Engine performance checks, Structural damage repairs
A) Levels of inspection applicable to EWIS, Guidance for performing zonal inspections, Installations and areas of concern
What does AWG stand for in wiring?
a) American Wire Gauge
b) Air Wire Gauge
c) Alloy Wire Gauge
a) American Wire Gauge
What happens as the number in AWG decreases?
a) The wire becomes thinner
b) The wire stays the same size
c) The wire becomes thicker
c) The wire becomes thicker
Why should you turn off the power before performing a continuity test?
a) To prevent electric shock
b) To ensure accurate measurement
c) To avoid damaging the multimeter
a) To prevent electric shock
What does it mean when a multimeter displays “1” or “O/L” while measuring resistance?
a) The resistance is very low
b) The resistance is high or open circuit
c) The multimeter is malfunctioning
b) The resistance is high or open circuit
What does Chapter 20 cover in relation to aircraft maintenance?
a) Electrical Wiring Interconnection Systems (EWIS)
b) Aircraft safety procedures
c) Fuel management systems
a) Electrical Wiring Interconnection Systems (EWIS)
Which of the following is correct regarding continuity tests for wires and insulation?
a) Low resistance is good for wires, and high resistance is good for insulation.
b) High resistance is good for wires, and low resistance is good for insulation.
c) resistance tests are not necessary for wires and insulation.
a) Low resistance is good for wires, and high resistance is good for insulation.
Which direction does the insulation test move?
a) Left to right
b) Right to left
c) Up to down
b) Right to left
What is the required insulation resistance to pass an insulation test for circuit breakers and terminals?
a) Above 10 Mega ohms
b) Above 100 Mega ohms
c) Below 10 Mega ohms
b) Above 100 Mega ohms
And for normal wires it needs to be above 10 Mega ohms to pass
When performing an insulation test, what voltage should the tester be set to?
a) 1.5 times the normal voltage
b) 2 times the normal voltage
c) 3 times the normal voltage
c) 3 times the normal voltage
(500v)
What is the maximum resistance allowed for bonding a wire?
a) 0.01 ohms
b) 0.05 ohms
c) 0.1 ohms
b) 0.05 ohms
Why are AC and DC currents grounded at separate points?
a) To prevent electrical interference
b) To increase current flow
c) To reduce power consumption
a) To prevent electrical interference
Where is dual grounding used?
a) On fuel tanks
b) On aircraft engines
c) On electrical panels
a) On fuel tanks
What should you do if you cut one strand off when cutting a wire?
a) Continue with the work
b) Redo the cut
c) Use the wire anyway
b) Redo the cut
What feature does a mini Daniel’s tool have that prevents it from being released when the crimp starts?
a) A lock mechanism
b) A certy ratchet
c) A safety lever
b) A certy ratchet
What feature do mini Daniel’s tools have for versatility in use?
a) Adjustable handles
b) Changeable turret heads
c) Interchangeable crimping dies
b) Changeable turret heads
What is the recommended gap between the crimp and the wire?
a) 1/16”
b) 1/32”
c) 1/8”
b) 1/32”
What system does P.I.D.G use for crimps?
a) Numeric system
b) Colour coded system
c) Alphabetical system
b) Colour coded system
How must in-line splices be located if there is more then one ?
a) In a straight line
b) Staggered
c) In the center of the wire
b) Staggered
Which crimping tool is required for AWG 2-8 wire?
a) Manual crimping tool
b) Hydraulic crimping tool
c) Pneumatic crimping tool
b) Hydraulic crimping tool
Where are all wires inserted on a crimping tool?
a) From the front
b) From the back
c) From the side
b) From the back
What is the purpose of an exertion insertion tool?
a) For front release
b) For rear release
c) For cutting wires
b) For rear release
What is the difference between rear release and front release?
a) Rear release is released from the front, and front release is released from the back
b) Rear release is released from the back, and front release is released from the front
c) Both are released from the back
b) Rear release is released from the back, and front release is released from the front
What do the last two numbers on a wire gauge indicate?
a) The voltage rating of the wire
b) The current rating of the wire
c) The gauge of the wire
c) The gauge of the wire
Why must all cables not be under stress?
a) To prevent damage to the insulation
b) To ensure proper electrical conductivity
c) To avoid mechanical failure
c) To avoid mechanical failure
What is the purpose of using foam insulation in dielectric cables?
a) To improve durability
b) To save weight
c) To enhance conductivity
b) To save weight
When is a continuity test carried out?
a) After the insulation test and prior to the bonding test
b) After the bonding test and prior to the insulation test
c) After both the bonding and insulation tests
b) After the bonding test and prior to the insulation test
