Electrical Wiring Interconnect System (EWIS) Exam Questions With Verified Answers.
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Course
Electrical Wiring
Institution
Electrical Wiring
Electrical Wiring Interconnect System
(EWIS) Exam Questions With Verified
Answers.
What is EWIS? - answerIt is any wire, wiring device or termination device installed in any area of
aircraft for the purpose of transmitting electrical energy between two or more intended termination
points.
Wha...
Electrical Wiring Interconnect System
(EWIS) Exam Questions With Verified
Answers.
What is EWIS? - answer✔It is any wire, wiring device or termination device installed in any area of
aircraft for the purpose of transmitting electrical energy between two or more intended termination
points.
What are the things EWIS does not include? - answer✔It does not include electrical equipment for
testing procedures, portable electrical devices not part of airplane's type design and fibre optics.
What are the things EWIS does include? - answer✔Wires, cables, bus bars, connectors, clamps, electrical
grounding and bonding devices, electrical splices, wire insulation, labels, pressure seals.
What are the two fundamental properties of insulation materials? - answer✔Insulation resistance and
dielectric strength.
What is insulation resistance? - answer✔It is the resistance to current leakage over and through the
surface of insulation.
Which device is used to measure insulation resistance? - answer✔A megohm-meter insulation tester.
This device does not damage the insulation.
What is dielectric strength? - answer✔It is the ability of the insulator to withstand potential difference
and is expressed in terms of the voltage at which the insulation fails.
How are the maximum dielectric strength values measured? - answer✔By raising the voltage of a test
sample until the insulation breaks down.
Which type of insulation materials are no longer used for new aircraft designs? - answer✔PVC and
nylon.
What are the substances used to make the insulation materials for new aircraft designs? -
answer✔Teflon, Kapton, PTFE.
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