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Module 11. Aeroplane aerodynamics, structures and systems
A diode connected across a coil will
•  prevent the coil being fitted the wrong way.
•  prevent back EMF and allow faster switching.
•  suppress arcing when relay is opening and closing.

Storklubba asking:
•  I think "prevent back EMF and allow faster switching" is the correct answer

Community comments: 0
Module 11. Aeroplane aerodynamics, structures and systems
A battery in situ on an aircraft
•  charges at a fairly constant rate because generator voltage remains constant.
•  may charged at an excessive rate if initial battery voltage is low.
•  may charge slowly if initial battery voltage is low.

Storklubba asking:
•  What is meant by "situ"?

Community comments: 0
Module 11. Aeroplane aerodynamics, structures and systems
American made crew oxygen cylinders are
•  green in colour with a LH thread.
•  green in colour with a RH thread.
•  black in colour with a RH thread.

Storklubba asking:
•  Charging connection has left hand threads, this question needs clarification.

Community comments: 0
Module 17. Propeller
Operation with the engine at maximum boost should be limited to
•  prop at fine to prevent overstressing the engine.
•  prop at course to prevent overstressing the engine.
•  prop at windmill to prevent overstressing the engine.

Storklubba asking:
•  While the question and answer is not wrong, the wording seems ambigious. "Maximum boost" is not a very technical term, and a simple (overspeed) clarification behind overstressing would be good. When i read this question i think that maximum boost means maximum power, and with the propeller at coarse you would be extracting more power from the engine therefore possibly "overstressing" it. I offcourse understand the answer they are looking for is coursing off the blade to not overspeed the engine and prop at high power. Am i missing something?

Community comments: 0
Module 17. Propeller
The limits for a tracking check are
•  1/4 inch maximum difference between adjacent blades.
•  1/8 inch maximum difference between opposite blades.
•  1/8 inch maximum difference between all blades.

ANGELA asking:
•  Isn't 1/16?

Community comments: 1
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