7.7 Electrical Wiring (EWIS)

Question 1

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.

Answer 1

A. The condition of being unbroken or uninterrupted.

Good continuity has a low resistance pathway

Question 2

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.

Answer 2

A. To ensure components have the same potential (or resistance) to ground and to prevent parallel paths for current flow.

Question 3

What is the purpose of the white tool in plastic insertion/removal?

A. For removal.
B. For insertion.
C. For both removal and insertion.

Answer 3

A. For removal.

Question 4

What is the purpose of the color tool in plastic insertion/removal?

A. For removal.
B. For insertion.
C. For both removal and insertion.

Answer 4

B. For insertion.

Question 5

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.

Answer 5

B. As direct and as short as possible to minimize Radio Frequency Interference (RFI) hazards.

Question 6

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.

Answer 6

B. Six times the diameter of the cable.

Question 7

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.

Answer 7

A. At a minimum of 61 cm (24 in) intervals.

Question 8

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.

Answer 8

A. Power loss from resistance and skin effect.

Question 9

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.

Answer 9

A. Heating of the dielectric material (insulation) between the conductors.

Question 10

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.

Answer 10

B. 10 times the outside diameter of the largest wire or cable.

Question 11

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.

Answer 11

C. 20 times the diameter of the cable.

Question 12

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.

Answer 12

B. 6 times the diameter of the cable.

Question 13

What is the duration of fire resistance for fire-resistant cables?
A) 10 minutes
B) 5 minutes
C) 15 minutes

Answer 13

B) 5 minutes

Question 14

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

Answer 14

B) Fire-resistant cables last 5 minutes, while fireproof cables last 15 minutes

Question 15

Where are fireproof cables typically used?
A) In general wiring
B) In critical fire zones
C) In low-temperature areas

Answer 15

B) In critical fire zones

Question 16

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

Answer 16

C) 2.5 cm

Question 17

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

Answer 17

A) Stand‐alone General Visual Inspections (GVI), Detailed (DET) inspections, Zonal Inspections

Question 18

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

Answer 18

A) Levels of inspection applicable to EWIS, Guidance for performing zonal inspections, Installations and areas of concern

Question 19

What does AWG stand for in wiring?

a) American Wire Gauge
b) Air Wire Gauge
c) Alloy Wire Gauge

Answer 19

a) American Wire Gauge

Question 20

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

Answer 20

c) The wire becomes thicker

Question 21

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

Answer 21

a) To prevent electric shock

Question 22

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

Answer 22

b) The resistance is high or open circuit

Question 23

What does Chapter 20 cover in relation to aircraft maintenance?
a) Electrical Wiring Interconnection Systems (EWIS)
b) Aircraft safety procedures
c) Fuel management systems

Answer 23

a) Electrical Wiring Interconnection Systems (EWIS)

Question 24

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.

Answer 24

a) Low resistance is good for wires, and high resistance is good for insulation.

Question 25

Which direction does the insulation test move? a) Left to right b) Right to left c) Up to down

Answer 25

b) Right to left

Question 26

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

Answer 26

b) Above 100 Mega ohms And for normal wires it needs to be above 10 Mega ohms to pass

Question 27

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

Answer 27

c) 3 times the normal voltage (500v)

Question 28

What is the maximum resistance allowed for bonding a wire? a) 0.01 ohms b) 0.05 ohms c) 0.1 ohms

Answer 28

b) 0.05 ohms

Question 29

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

Answer 29

a) To prevent electrical interference

Question 30

Where is dual grounding used? a) On fuel tanks b) On aircraft engines c) On electrical panels

Answer 30

a) On fuel tanks

Question 31

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

Answer 31

b) Redo the cut

Question 32

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

Answer 32

b) A certy ratchet

Question 33

What feature do mini Daniel's tools have for versatility in use? a) Adjustable handles b) Changeable turret heads c) Interchangeable crimping dies

Answer 33

b) Changeable turret heads

Question 34

What is the recommended gap between the crimp and the wire? a) 1/16” b) 1/32” c) 1/8”

Answer 34

b) 1/32”

Question 35

What system does P.I.D.G use for crimps? a) Numeric system b) Colour coded system c) Alphabetical system

Answer 35

b) Colour coded system

Question 36

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

Answer 36

b) Staggered

Question 37

Which crimping tool is required for AWG 2-8 wire? a) Manual crimping tool b) Hydraulic crimping tool c) Pneumatic crimping tool

Answer 37

b) Hydraulic crimping tool

Question 38

Where are all wires inserted on a crimping tool? a) From the front b) From the back c) From the side

Answer 38

b) From the back

Question 39

What is the purpose of an exertion insertion tool? a) For front release b) For rear release c) For cutting wires

Answer 39

b) For rear release

Question 40

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

Answer 40

b) Rear release is released from the back, and front release is released from the front

Question 41

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

Answer 41

c) The gauge of the wire

Question 42

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

Answer 42

c) To avoid mechanical failure

Question 43

What is the purpose of using foam insulation in dielectric cables? a) To improve durability b) To save weight c) To enhance conductivity

Answer 43

b) To save weight

Question 44

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

Answer 44

b) After the bonding test and prior to the insulation test