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NAVEDTRA 14105A, FLUID POWER – Q&A
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NAVEDTRA 14105A, FLUID POWER – Q&AHow can the specific gravity of a liquid or solid be expressed?
• As a ratio between the weight of the substance and the density of a
volume of water
• As a ratio between the weight of the substance and the weight of an equal
volume of water
• As the number that shows the density of the substance in the metric
system
• As in 2 and 3 above Correct Ans - As a ratio between the weight of
the substance and the weight of an equal volume of water
The purpose of your textbook Fluid Power is to provide you with
• information on fluid power application for specific equipment
• a basic reference concerning fundamentals of fluid power
• a basic guide for use in maintaining hydraulic equipment
• a reference concerning advanced concepts of fluid power Correct Ans
- a basic reference concerning fundamentals of fluid power
A device used for measuring the specific gravity of a liquid is known as a
• hydrometer
• hydroscope
• hydrostat
• hydrography Correct Ans - hydrometer
The critical factors affecting the state of matter are
• density and specific gravity
• pressure and density
• pressure and temperature
• temperature and weight Correct Ans - pressure and density
The study of hydraulics was originally confined to the study of the physical
behavior of water at rest and in motion. The term "hydraulics" now
includes the physical behavior of all
• gases
• liquids
,• liquids gases and solids
• liquids and gases Correct Ans - liquids
The head or pressure due to the weight of a fluid depends on the density of
the fluid and the
• area of the bottom surface of the container
• vertical height of the fluid
• geometric shape of the container
• total volume of the fluid Correct Ans - area of the bottom surface
of the container
Pressure can be measured in terms of force per unit area.
• True
• False Correct Ans - True
Pascal's law pertains to the
• differences of floating and submerged bodies
• construction of aqueducts
• transmission of force in confined fluids
• use of water wheels for doing work Correct Ans - transmission of
force in confined fluids
What change if any will occur in the volume and weight of a substance if its
temperature changes?
• Its weight will change but its volume will remain constant
• Its volume will change but its weight will remain constant
• Both its volume and weight will be unaffected
• Both its volume and weight will change Correct Ans - Its volume
will change, but its weight will remain constant
Which statement about specific gravity is false?
• Specific gravity of a substance should be measured at a standardized
temperature and pressure
• The density of a solid can be determined by multiplying its specific
gravity times the density of water
,• Specific gravity will vary with the size of the sample being tested
• Specific gravity can also be described as specific weight or specific
density Correct Ans - Specific gravity will vary with the size of the
sample being tested
The pressure of force exerted on the end of a rigid metal bar is applied
equally and undiminished to all surfaces of the bar.
• True
• False Correct Ans - True
Which of the following is a favorable characteristic of a fluid power system?
• Very large forces can be controlled by much smaller ones
• Different parts of the system can be located at widely separated points
• Motion can be transmitted without the slack inherent in the use of solid
machine parts
• Each of the above Correct Ans - Each of the above
What is the specific gravity of a solid object which weighs 49.92 pounds per
cubic foot?
• 2.7
• 0.9
• 0.8
• 0.789 Correct Ans - 2.7
The side of a thin-walled chamber partially evacuated of air is the source of
movement for the
• Fahrenheit thermometer
• hydrometer
• mercury thermometer
• aneroid barometer Correct Ans - aneroid barometer
Lines A and B are pressurized to 50 psi. How much force is applied to each
surface and which way will the piston move?
, • C = 1000 pounds Correct Ans - D = 1250 pounds, piston will move
to the left
• C = 1250 pounds, D = 1000 pounds, piston will move to the left
• C = 1250 pounds, D = 1000 pounds, piston will move to the right
• C = 1000 pounds, D = 1250 pounds, piston will move to the right ,C =
1250 pounds, D = 1000 pounds, piston will move to the left
Assume that the output piston has a diameter of 6 inches and is subject to a
pressure of 10 pounds per square inch. What is the force exerted on the
output piston?
• 31.4 pounds
• 314.0 pounds
• 282.6 pounds
• 28.26 pounds Correct Ans - 31.4 pounds
The term "fluid power" includes hydraulics and pneumatics Correct
Ans - and is power that is applied through liquids or gases pumped or
compressed to provide force and motion to mechanisms.
• True
• False ,True
All matter is classified according to its state as a solid Correct Ans -
a liquid, or a gas.
• True
• False ,True
What is the specific gravity of a liquid which weighs 44 pounds per cubic
foot at 4°C?
• 0.705
• 0.789
• 0.624
• 0.440 Correct Ans - 0.440
Assume that the input piston has an area of 3 square inches with a force of
45 pounds. What is the pressure in the system?
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