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Electrostatic and Plasma Effects on Space Tribology Quiz

Posted on April 20, 2026 by

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Question 1 of 7
1. Question
Which statement best explains why electrostatic discharge can initiate in space mechanism contacts?
Charge always flows freely through lubricants so no buildup occurs
Only external lightning strikes can produce sufficient voltage to arc in vacuum
Vacuum eliminates all friction so fields have no effect until contact is lost
Thin films and asperities form capacitors that concentrate electric fields until breakdown occurs
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Question 2 of 7
2. Question
In geostationary orbit, the primary charging concern for mechanisms is associated with which factor?
Continuous micrometeoroid impacts that ground the structure
Hot sparse electrons that can cause deep dielectric charging and differential surface potentials
High density cold plasma with abundant atomic oxygen erosion
Thermal convection currents that neutralize surface charge rapidly
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Question 3 of 7
3. Question
What is a key effect of oxygen rich plasma on MoS2 solid lubricant films?
Transformation into a metallic phase that eliminates wear
Enhanced basal plane alignment that permanently lowers friction
Conversion to oxides and sulfates that increase friction and reduce easy shear
Complete immunization against radiation induced chemistry
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Question 4 of 7
4. Question
Which lubricant strategy can help manage charge buildup while meeting vacuum constraints?
Selecting only greases with the highest possible viscosity index
Adding water based antistatic agents to improve conductivity
Use of ionic liquids or conductive additives that provide finite conductivity within outgassing limits
Exclusive use of highly insulating oils to avoid any current flow
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Question 5 of 7
5. Question
Which mitigation approach directly reduces line of sight plasma access to a critical sliding track?
Switching to a purely ceramic bearing with no metal elements
Installing a perforated conductive shroud that acts as a Faraday cage
Increasing the roughness of the sliding surface to trap plasma
Replacing all lubricants with dry air purges
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Question 6 of 7
6. Question
Which measurement is most diagnostic for early detection of microarcing in a bearing?
A stable and constant friction level with no variability
Transient current spikes correlated with torque ripple or acoustic emission bursts
Absolute humidity levels measured in the surrounding vacuum
A gradual decrease in housing temperature over months
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Question 7 of 7
7. Question
What is the principal reason to tune coating resistivity rather than maximize it in space mechanisms?
Resistivity has no interaction with secondary electron yield
Low resistivity always causes cold welding between surfaces
High resistivity guarantees zero wear regardless of load
Moderate resistivity allows charge to bleed off slowly and prevents dangerous potential buildup at the contact
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