When a hydraulic pump is termed "fixed displacement" it:
a. will always be used with a closed center directional control valve b. can vary it's gpm at a fixed RPM
c. has a fixed RPM
d. has a fixed output for each revolution
D
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Acetylene, when allowed to mix with air, becomes unstable at _____ psi.
a. 5 b. 10 c. 15 d. 20
____________________ or internal combustion engines tend to increase efficiency (producing more power per unit of fuel consumed) as their operating temperatures increase until some upper limit is reached.
Fill in the blank(s) with the appropriate word(s).
_______ are made up of a solid piece of material that manipulates the flow of electrons without any moving parts.
A. Limit switches B. Solid-state devices C. Optical encoders D. Target flowmeters
Where applied to surfaces constructed around a datum axis, total runout out is used to control cumulative variations of ____.
A. coaxiality B. circularity C. profile of a surface D. both a and c E. all of the above