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Module:     Show:
Module 6. Materials & hardware
Specified time of contact between the indentor and test piece in a vickers or brinell hardness test is
•  20 seconds.
•  10 seconds.
•  15 seconds.

Leehenson asking:
•  This question is unclear, as contact time is different depending on ferrous or non-ferrous metals.

Community comments: 0
Module 6. Materials & hardware
Electrochemical reaction is caused by the contact of
•  bonding.
•  moisture on the surface of the metal.
•  dissimilar metals.

Leehenson asking:
•  Wouldn't C be correct as 'electrochemical' corrosion requires a anode and a cathode, where as a 'chemical' corrosion being oxidation would be moisture on the surface of the metal? Please help? Thanks.

Community comments: 4
Module 6. Materials & hardware
A square around the NW digit in the quadrant of a fastner would indicate
•  interference fit fastener.
•  hi-lock to be used
•  fluid tight fastner.

Leehenson asking:
•  Can someone help explain quadrants of fasteners please? Thanks.

Community comments: 1
Module 6. Materials & hardware
The material specifications for a certain aircraft require that a replacement oil line be fabricated from3/4 inch, 0.072 5052-0 aluminium alloy tubing. What is the inside dimension of this tubing?
•  0.688 inch.
•  0.606 inch.
•  0.750 inch.

Leehenson asking:
•  Can someone help explain please? Thanks.

Community comments: 0
Module 8. Basic aerodynamics
The difference between transient droop and static droop is
•  overswing.
•  underswing.
•  a hole in one.

santoshkumarsah asking:
•  can anyone explain me what is trasient droop and static droop?

Community comments: 0
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