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MMET 401 Final Exam ALL End of Chapter Questions & Answers
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MMET 401 Final Exam ALL End of Chapter Questions & Answers
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MMET 401 Final Exam ALL End ofChapter Questions & Answers
A(n) ____ helps clean and cool hydraulic fluid, separate out entrained air and water from
hydraulic fluid, and send hydraulic fluid to the pump. Correct Ans-resevoir
A(n) _______ heat exchanger operates similar to an automobile radiator by dissipating heat
through convection Correct Ans-air-cooled
A(n) ______ filter is designed to operate in a vacuum and is connected to the hydraulic system
before the pump and outside of the reservoir to protect the pump from contaminants in the
reservoir. Correct Ans-suction line
A(n) ____ is a device used to allow a visual inspection of the hydraulic fluid level in a reservoir
at any given time Correct Ans-sight gauge
A(n) _____ is placed in a reservoir to attract and hold ferrous metal particles that have
contaminated the system but have not been recovered by system filters or strainers. Correct
Ans-permanent chip magnet
A(n) _____ is a device used to access a reservoir when it requires cleaning rom the buildup of
solid materials. Correct Ans-clean-out cover
,It is estimated that it costs ____ times more to extract contaminants from hydraulic fluid than it
does to prevent them from entering a hydraulic system Correct Ans-10
A(n) _____ is commonly used to heat the hydraulic fluid in a reservoir. Correct Ans-electric
heater (or immersion heater)
A(n) _____ is a foreign substance in the hydraulic fluid that is not meant to be part of the fluid.
Correct Ans-contaminant
A(n) ____ is a filter placed in front of the return line before it enters the reservoir. Correct
Ans-return-line
A(n) ____ rating is a value that indicates the diameter of the largest hard, sphere-shaped particle
that can pass through a filter under specific test conditions. Correct Ans-absolute
A(n) _____ is used to allow air in and out of a reservoir as the pump delivers hydraulic fluid into
the system. Correct Ans-breather/filler cap assembly
A(n) _______ is a mechanical device used to transfer heat from one fluid to another fluid.
Correct Ans-heat exchanger
A(n) _____-type filter element is composed of multiple layers of fabric or threaded material.
Correct Ans-depth
,A(n) ____ filter is equipped with a bypass check valve to allow hydraulic fluid to bypass the
filter element as the element becomes clogged. Correct Ans-bypass
A(n) _____ filtration unit is sometimes referred to as an off-line filter Correct Ans-portable
A(n) ____ is a screen, mesh, or perforated obstruction used to separate a solid from a liquid.
Correct Ans-strainer
Some filters are equipped with a bypass check valve that is typically set between ____ psi and
___ psi of pressure drop. Correct Ans-15;20
_____ is the reduction of the dimensions of a material due to grinding. Correct Ans-abrasion
components that have been dismantled from a hydraulic system and cleaned are dried with
______ Correct Ans-low pressure, clean, dry compressed air
_____ are used to measure electric or hydraulic motor speed Correct Ans-tachometers
a ____ is a standard given by the manufacturer that indicated the least amount of bend that can
be used for a specific type of hose Correct Ans-minimum hose bend radius
the ____ troubleshooting method is a fluid power troubleshooting method traces problems from
the beginning of the fluid power system (prime mover, hydraulic pump, or air compressor) to the
end (actuator) Correct Ans-beginning to end
, a pneumatic system uses _____ for lubrication Correct Ans-lubricating oil
if manufacturers recommendations are not available, mobile hydraulic equipment typically
should be inspected every 400-600 hr or every ____ months Correct Ans-three
a _____ is a mechanical device on a pneumatic actuator that applies tension to the seals or
packing to prevent air leaks around the circumference of a rod or shaft Correct Ans-packing
nut
because hoses and tubing used in fluid power systems can become easily damaged and are
susceptible to other problems such as kinks or premature wear, it is recommended that they only
be used with moving components and in lengths of _____ feet or less Correct Ans-3
the _____ troubleshooting method is preferred when actuators are not operating, but the gauges
at the beginning of the system indicate normal levels Correct Ans-end to beginning
air leaks in a pneumatic system can waste up to ______% or higher of the pneumatic system
energy Correct Ans-25
the most common problem in pneumatic systems is insufficient air pressure or ____ Correct
Ans-airflow
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