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MMET 401: Exam 1- Questions & Answers
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MMET 401: Exam 1- Questions & Answers
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MMET 401: Exam 1- Questions &Answers
piping sections in a hydraulic system can only be connected together through welding.
Correct Ans-false
once a fluid is flowing, its speed never changes Correct Ans-false
a nonpositive seal is a type of seal that does not allow any amount of fluid leakage. Correct
Ans-false
tubing is more commonly used in hydraulic systems than pneumatic systems Correct Ans-
true
fluid travels at higher velocity through larger diameter piping than it does through low diameter
piping. Correct Ans-false
straight pipe threads are preferred over tapered pipe threads because of the reduced possibility
of leakage. Correct Ans-true
the difference between fluid flow (gpm) and velocity (fps) is that fluid flow is distance per unit
of time, while velocity is volume per unit of time. Correct Ans-false
,fluid flow Correct Ans-gallons per minute
velocity Correct Ans-feet per minute
advantages of tubing over piping Correct Ans-- allows for more laminar fluid flow
- requires fewer connections
- absorbs vibrations better
- allows for faster assembly and disassembly
- lighter weight
common types of connector threads Correct Ans-- SAE straight thread
- NPT/NPTF American pipe thread
- BSPP - British parallel pipe thread
- BSPT - British taper threads
- Metric Parallel
- Meter Taper
three factors that must be considered when selecting pipe thread sealant Correct Ans-- pipe
size
- vibration
- sealant hardening time
,fixed-displacement pumps are rated by fluid flow and Correct Ans-pressure rating
Hydraulic pump types include vane, gear, and ____ pumps Correct Ans-piston
______ is localized gaseous condition within a stream of fluid that occurs when pressure is
reduced to vapor pressure Correct Ans-cavitation
a lobe pump requires _____ to drive the lobe-shaped driven gears. Correct Ans-timing gears
______ is the volume of hydraulic fluid moved during each revolution of the shaft of a pump.
Correct Ans-displacement
A _____ pump has an inner rotor that meshes with the gear tooth of an outer rotor. Correct
Ans-gerotor
A variable-displacement pump varies the amount of hydraulic fluid with movable internal
components while the _____ of the prime mover remains fixed. Correct Ans-rpm
Bent-axis piston pumps are different from axial piston pumps because their ____ are at an angle
(offset). Correct Ans-pistons and piston blocks
A(n) ____ plate is an angled plate used to extend and retract the pistons in an axial piston pump
Correct Ans-swash
, the main categories of hydraulic pumps are dynamic and _____ pumps. Correct Ans-positive-
displacement
the most common method to vary the angle of a swash plate is through _____. Correct Ans-
internal pilot pressure
A ____ is part of a vane pump and houses the vanes, rotor, and cam ring, which are all placed
between two end plates. Correct Ans-cartridge assembly
gear pumps may be external, internal, lobe or _____. Correct Ans-gerotor
_____ is the highest amount of pressure at which a pump can create fluid flow. Correct Ans-
pressure rating
A(n)_____ vane pump allows adjustment of the flow rate of the pump. Correct Ans-variable
displacement, pressure-compensated
A(n) ____ is an airproof and/or fluidproof joint between two members. Correct Ans-seal
Vane pump types include: unbalanced, balanced, and Correct Ans-variable-displacement
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