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Adaptive Lubrication For Thermal Cycling In Space Mechanisms Quiz

Posted on April 20, 2026 by

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Question 1 of 7
1. Question
Which design goal best defines adaptive lubrication in thermal cycling regimes?
Using a single coating that is harder than the counterface
Maintaining a continuous protective film through all phases of the temperature cycle
Eliminating all liquid lubricants to avoid outgassing risk
Maximizing viscosity at all times to prevent squeeze film collapse
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Question 2 of 7
2. Question
What is the primary function of phase change microcapsules in an adaptive lubricant?
Increase permanent viscosity to prevent any shear thinning
Supply oxygen to enable classic antiwear film growth in vacuum
Chemically etch counterfaces to increase roughness
Provide latent heat buffering and release liquid at cold starts, then re-solidify to prevent migration
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Question 3 of 7
3. Question
Why are nanoparticles like graphene and MoS2 valuable in adaptive fluids for space?
They build weak networks that increase low-temperature viscosity and shear thin under motion
They eliminate the need for any base fluid in the system
They evaporate at hot plateaus to cool the contact by endothermic loss
They permanently bond to form rigid composite layers that raise friction
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Question 4 of 7
4. Question
Which statement about self-restructuring solid coatings is most accurate?
Only oxide ceramics are suitable for vacuum tribology at high temperature
Solid coatings are static and cannot change during operation
Coating stacks should always be uniform to avoid stress gradients
Doped MoS2 and hydrogenated DLC can remodel their surface under load and heat to sustain low friction
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Question 5 of 7
5. Question
Which in-situ metric most directly indicates separation by a lubricating film during operation?
Chamber wall temperature
Vacuum pump current
Electrical contact resistance across the sliding interface
Color of the counterface
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Question 6 of 7
6. Question
In a reliability model for thermal cycling, why are Markov states useful?
They guarantee a normal distribution of failure cycles
They fix the Weibull shape parameter to unity
They represent distinct phases like cold start, steady run, and hot dwell with different hazard rates
They remove the need for any physical testing
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Question 7 of 7
7. Question
Which compatibility check is especially critical when considering ionic liquids for space use?
Matching color to reduce radiant heat gain
Corrosion of aluminium and copper alloys under expected thermal and radiation exposure
Confirming that it foams strongly to trap air
Ensuring the liquid freezes at the highest expected temperature
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