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WorksheetsFluid Power Exam 2
Total questions: 111
Worksheet time: 1hrs 26mins
What characteristic of a fluid does the term specific gravity describe?
Weight
Viscosity
Density
Volume
Pressure is measured in _____ in the English (Imperial) system.
Pounds per square inch
Feet per second
Newtons
Pounds
Which of the following is not needed in order to calculate the work a hydraulic cylinder can do?
Piston travel (in)
Pressure (psi)
Piston area (in2)
Power (ft-lb/min)
Pascal's law states that pressure exerted on a confined liquid:
Is distributed equally throughout the liquid
Is greater at the edges of the container then at the center
Cannot be transmitted
Is transmitted in a straight line
(a) force is what gives an object weight
The density of a liquid is expressed in terms of (a) . (two words)
The specific gravity of a liquid is determined by comparing the weight of the fluid to the weight of an equal volume of (a)
The amount of work done when a force moves an object through a distance is expressed in what units?
Foot-pounds
Newton-meters
Pounds
Pounds per square inch
The amount of work done in a give period of time is called (a)
Name the missing type of energy produced in a hydraulic system:
hydraulic, kinetic, potential, and (a)
Name the missing type of energy produced in a hydraulic system:
hydraulic, heat, kinetic, and (a)
Name the missing type of energy produced in a hydraulic system:
heat, kinetic, potential, and (a)
Name the missing type of energy produced in a hydraulic system:
hydraulic, heat, potential, and (a)
Can a liquid be compressed?
yes
no
The rapid intermingling of molecules of one gas or liquid with another is called (a)
What factor of a substance determines the pressure it exerts on the bottom of a vessel?
Mass
Weight
Volume
If a force of 200 lbs is exerted against a piston having an area of 5 square inches, what is the resulting pressure?
(a) psi
What word can describe the ideal fluid flow in a hydraulic power system?
(a)
When a pipe handling a fluid is too small for the velocity of that fluid, what happens to the flow?
The fluid flow becomes (a)
The two types of energy a hydraulic fluid has are (a) and potential
The two types of energy a hydraulic fluid has are kinetic and (a)
According to Bernoulli's principle, when flow increases, pressure will _______.
decrease
stay the same
increase
become unpredictable
The surface tension characteristics of petroleum-based hydraulic fluids improves when ____ are added.
Demulsifier additives
Viscosity-index-improver additives
Anti-wear agents
Pour-point depressants
The ASTM D2270 standard is used to determine __.
What is safe for oil additives
Weight classes for oil
Oil moisture content
Oil viscosity index
Oil viscosity decreases when temperature ____.
Decreases
Increases
Remains the same for long periods
Becomes erratic
____ shown on the sight gauge indicate the high and low level of the oil.
One mark
Two marks
LEDs
Indicator lights
In order to move fluid through a filter, a hydraulic pump and ____ is necessary.
Strainer
Filter
Motor
Tubing
To prevent wear and provide long life, the moving parts in the hydraulic system must be ____.
Certified
Tested
Lubricated
Anodized
What type of smell does oil have when it starts to break down?
Sweet
Strong
Bitter
None
To transfer oil from a container to the oil reservoir, use a portable ____ if one is available.
Bucket
Filter cart
Funnel
Metal can
If bypass indicators on the filters reach a level that shows the filter or filters are ____, stop the filter cart, replace the filter elements and restart the unit.
New
Working
Filtering
Loaded
A spin-on filter is used for ____ applications that include the return line and the suction line.
High pressure
All
No
Low pressure
A(n) ____ filter has a filter element enclosed inside a metal shield.
Spin-on
Cartridge-type
Suction strainer
Pump
Before installing the new filter element, apply a thin film of ____ to the filter seal to lubricate the seal.
Dirty oil
Clean oil
Motor oil
Mineral oil
The replaceable element of a cartridge filter is located in a(n) ____, which is usually bolted onto an installed housing.
Metal shield
Reservoir
Pump
Strainer
The beta system is for rating ____.
Pump efficiency
Hydraulic filters
Oil viscosity
Hose capacity
The ____ Contamination Code uses a code of three numbers to indicate the cleanliness of a fluid, such as 21/18/15.
ISO 6604
ISO 4406
IOS 6604
IOS 4406
More than ____ of all hydraulically powered machine downtime and malfunctions are due to contamination in the fluid.
0.1
0.25
0.5
0.35
The bypass check valve opens on a filter is an indication the ____.
The system pressure is too high
Filter has reached its capacity
System has a decrease in flow
The system is hot
As a filter collects dirt, the ____ difference will grow, indicating that it is time to clean or replace the filter.
Pressure
Volume
Flow
Dissolved solids
The strainer assembly is usually located within the ____, but in some applications an external strainer is located on the inlet line.
Pump
Reservoir
Motor
Filter
The most common location for a filter is in the ____, where the filter cleans all fluid returning to the reservoir.
Pump
Main return line
Motor
Reservoir
Hydraulic circuits usually have the strainer mounted ____.
At the inlet of the circuit
The outlet line of the pump
Inside the reservoir
On the outside of the tank
A hydraulic fluid must be able to do all of the following except:
Flow easily
Transmit power
Reduced friction
Compress easily
A hydraulic fluid that exhibits little change in viscosity when heated up is said to have a high:
Viscosity index
Film strength
Pour point
Friction point
The ability of a fluid to penetrate into small clearances between closely fitted parts is determined by the fluid's:
Film strength
Pour point
Viscosity
Friction point
Which of the following, when added to hydraulic fluid, will limit oxidation?
Liquid wrench
Pipe joint compound
A chemical inhibitor
Water
The best method of controlling hydraulic fluid contamination is the use of:
Proper temperatures
Chemical additives
Duplex filters
Good maintenance practices
List the missing function of the two major functions of hydraulic fluid:
To transmit (a) through the system, and to provide lubrication to reduce friction between mechanical parts
Does a low-viscosity hydraulic fluid flow faster or slower than a high-viscosity fluid?
Slower
Faster
About the same
A measure of the extent to which the viscosity of a fluid changes with changes in temperature is called the (a)
The (a) of a fluid describes the lowest temperature at which it can flow?
A (a) is a fluid that resists the formation of water-fluid emulsion?
The property of a fluid that allows it to maintain a film under a heavy load is called (a)
(a) is the property of a fluid that gives it the clinging slipperiness to lubricate parts.
The chemical reaction of a fluid with oxygen from the air is called (a)
(a) is a general term to describe any deterioration of a metallic surface caused by the chemical reaction of an acid or alkali.
A form of corrosion specific to when steel and iron oxidizes while moisture is also present is called (a)
Is water heavier or lighter than hydraulic fluid?
heavier
lighter
How are fine contaminant particles usually measured?
The (a) is a customary unit for measuring the dimensions of fine particles.
What are the two types of filter media used in hydraulic systems?
(a) media and depth media.
What is the usual cause of abrasions migration?
(a) that causes the filtering medium to loosen from its housing or seal
Most strainers used in hydraulic systems have what kind of surface medium?
Most strainers use a porous (a) .
How are contaminations removed from a stacked-disk strainer?
It has housing that has a manual (a) to remove the accumulated particles from the surface without shutting the system down.
What are two advantages of Filters over strainer?
They are able to accumulate (a) contaminant particles better than strainers, and they can continue to function with a comparatively low pressure drop.
Most filters are furnished with what kind of media?
(a)
What should you do when a depth filter becomes dirty?
(a)
In what application are wound-yarn filters used?
This type of filter is preferred for (a) concentrations of particles.
What is the advantage of pleating a paper medium?
It provides a large (a) .
When replacing a filter, you should always check the condition of what component?
(a)
What problem is indicated by high pressure drops across new filters or strainers?
They are probably not (a) for the application.
List the missing function of the two major functions of hydraulic fluid:
To transmit power through the system, and to provide (a) to reduce friction between mechanical parts
What are two advantages of Filters over strainer?
They are able to accumulate smaller contaminant particles better than strainers, and they can continue to function with a comparatively (a) pressure drop.
What are the two types of filter media used in hydraulic systems?
Surface media and (a) media.
A fluid power system that uses water or some other liquid as its transmitting fluid is called a (a) system.
A (a) is a push or pull of an object, which can cause the object to change its state of motion
(a) is a measure of the amount of matter in an object
Two common forces are (a) and friction
(a) is the amount of force applied to an area
Pressure =
force ÷ area
area ÷ force
Fluid power systems consider two types of pressures:
(a) pressure and gauge pressure
Fluid power systems consider two types of pressures:
absolute pressure and (a) pressure
which is the short version for absolute pressure?
psia
psig
Work =
Force X Distance
Force X Power
Power X Distance
none of the above
Work is given in either (a) or inch-pounds.
Work is given in either foot-pounds or (a) .
(a) is the imperial unit for power
(a) pressure is the pressure exerted by a static liquid (liquid at rest)
The shape of the container and the volume of liquid in the container changes the hydrostatic pressure.
(a) is defined as the amount of work done over time
power =
work ÷ time
time ÷ work
which kind of flow is preferred?
laminar
turbulent
(a) is the physical property of fluid thickness, or resistance to flow.
For hydraulic systems handling heavy loads, hydraulic fluids require ____ viscosity.
higher
lower
if viscosity is too ___, the fluid may not flow well enough to coat the surfaces
high
low
if viscosity is too ___, it can cause external leakage in certain areas.
low
high
The pour point must be ____ than the operating temperature of the system.
lower
higher
dirt is a contaminant that can affect a fluids performance
air is a contaminant that can affect a fluids performance
moisture is a contaminant that can affect a fluids performance
heavy contaminants usually (a) at the bottom of a fluid that is standing still or almost still.
Strainers and filters are described by their (a) .
(a) is the amount of contaminant particles the device can collect without causing the maximum allowable pressure drop.
this is the schematic symbol for a filter or strainer
It is important to remove as much contamination as possible to avoid wear/tear, as well as to maintain proper operation
Contaminants can be removed by settling, filtering, straining, screening, and
by (a)
Contaminants can be removed by settling, filtering, straining, (a) , and
by magnetism
Contaminants can be removed by settling, filtering, (a) , screening, and
by magnetism
Contaminants can be removed by settling, (a) , straining, screening, and
by magnetism
Contaminants can be removed by (a) , filtering, straining, screening, and
by magnetism
performance ratings of strainers and filters are based on their (a)
