MMET 401 FINAL EXAM QUESTIONS & ANSWERS
Velocity increases __ times to maintain a constant rate of fluid flow if the diameter of a
conductor is halved. - Answer -Four
7 steps for Selecting proper hose
STAMPED - Answer -Size
Temperature
Application
Material to be conveyed
Pressure
Ends, fitting/ coupling
Delivery, volume/velocity
The standard flare angle for hydraulic tubing fitting is____ degrees from the centerline -
Answer -37
A ___ mark is a mark used as a guide to join parts together - Answer -witness
___ is the speed of fluid flow through a hydraulic line. - Answer -Velocity
Pipes are rated type of scale known as a schedule and range from __ to __. - Answer -
10, 160
When performing certain mathematical calculations, the symbol ___ is used to indicate
a change in a particular valve - Answer -Delta
A ___ is a tool used to cut threads in steel pip. - Answer -Pipe Threader
___ are/is a passage series of passages in fluid power system that is constructed of
metal, plastic, or plasticized rubber and conforms to ANSI standards - Answer -Piping
A ___ is a line mark or print on a hose that indicates if a hydraulic hose has been
improperly twisted after installation - Answer -Layline
___ is an increase in speed, measured in fps - Answer -Acceleration
___ determines the maximum pressure a pipe can withstand - Answer -Wall thickness
___ tubing is commonly used in hydraulic systems - Answer -Carbon Steel
___ fittings are typically used in hydraulic equipment when attaching tubing to a hose. -
Answer -flared
,The velocity of fluid flow increases at any restriction in the piping if the ___ remains the
same in the system - Answer -Flow Rate
A(n) ___ is a metal sleeve used for joining one piece of tubing to another - Answer -
Ferrule
A(n) ____ is a piece of pipe that is used to interconnect pipes and allows them to
change direction - Answer -Pipe Fitting
The bending radius of flexible hose must be greater than ___ times its ID. - Answer -Six
The ___ of fluid flow must increase at any restriction to maintain constant flow rate -
Answer -velocity
A(n) ___ fitting is a tubing fitting in which the end is spread outward - Answer -flared
Pressure spikes that occur within a hydraulic system can be as high as ___% of the
operating pressure. - Answer -50
the two types of ___ used in hydraulic system are black and stainless steel - Answer -
piping
All hydraulic hoses are constructed with a minimum of ___ layers - Answer -Three
A(n) ___ mark can be used on a nut to avoid under or overtightening certain
components - Answer -Witness
___ is a method of removing scale and rust from metal through chemical treatment -
Answer -Pickling
Piping is available in standard sizing with ODs up to ___" - Answer -12
Tubing installed in a hydraulic system cannot be threaded - Answer -True
The lower a pipe schedule number, the smaller the ID of the pipe - Answer -False, The
higher the schedule number the smaller the ID
Galvanized pipe should not be used with hydraulic systems - Answer -True, it will
degrade the hydraulic fluid. it can only be used in pneumatic systems
Hydraulic and pneumatic pipes each require the same amount of support in a fluid
power system - Answer -False, hydraulic systems require more support because they
are normally larger in size and are under higher pressures
AA 45 degree angle should not be used for high-pressure hydraulic systems - Answer -
True
, Pipes that are bolted to flanges do not require welding at the pipe joint - Answer -False
Flow velocity in a pipe is related to the area of its inside diameter - Answer -True
When applying pipe thread sealant, the last few threads at the end of the pipe should
not have any sealant applied to them. - Answer -True
Piping sections in a hydraulic system can only be connected together through welding -
Answer -False
Once a fluid is flowing, its speed never changes - Answer -False
A nonpositive seal is a type of seal that does not allow any amount of fluid leakage -
Answer -False, allows a certain amount of fluid to leak which provides a lubricating film
between surfaces. a positive seal doesnt allow leakage
Tubing is more commonly used in hydraulic systems than in pneumatic systems -
Answer -True
Fluid travels at a higher velocity through large diameter piping than it does through low
diameter piping - Answer -False, It will actually move slower
Straight pipe threads are preferred over tapered pipe threads because of the reduced
possibility of leakage - Answer -True
The difference between fluid flow(gpm) and velocity(fps) is that fluid flow is distance per
unit time, while velocity is volume per unit time - Answer -False, fluid flow is volume per
unit time, and velocity is distance per unit time
In a directional control valve, port ___ receives fluid flow from the pump, while port ___
returns fluid flow to the reservoir - Answer -P; T
Fixed-displacement pumps are rated by fluid flow and ___. - Answer -Pressure Rating
hydraulic pump types include gear, vane, and ___ pumps - Answer -Piston
___ is a localized gaseous condition within a stream of fluid that occurs when pressure
is rediced to vapor pressure - Answer -Cavitation
A lobe pump requires ___ to drive the lobe-shaped driven gears - Answer -
A(n) ___- center position directional control valve allows allows a hydraulic system to
operate with more than one actuator and with each actuator operating independently of
the others - Answer -Closed
Velocity increases __ times to maintain a constant rate of fluid flow if the diameter of a
conductor is halved. - Answer -Four
7 steps for Selecting proper hose
STAMPED - Answer -Size
Temperature
Application
Material to be conveyed
Pressure
Ends, fitting/ coupling
Delivery, volume/velocity
The standard flare angle for hydraulic tubing fitting is____ degrees from the centerline -
Answer -37
A ___ mark is a mark used as a guide to join parts together - Answer -witness
___ is the speed of fluid flow through a hydraulic line. - Answer -Velocity
Pipes are rated type of scale known as a schedule and range from __ to __. - Answer -
10, 160
When performing certain mathematical calculations, the symbol ___ is used to indicate
a change in a particular valve - Answer -Delta
A ___ is a tool used to cut threads in steel pip. - Answer -Pipe Threader
___ are/is a passage series of passages in fluid power system that is constructed of
metal, plastic, or plasticized rubber and conforms to ANSI standards - Answer -Piping
A ___ is a line mark or print on a hose that indicates if a hydraulic hose has been
improperly twisted after installation - Answer -Layline
___ is an increase in speed, measured in fps - Answer -Acceleration
___ determines the maximum pressure a pipe can withstand - Answer -Wall thickness
___ tubing is commonly used in hydraulic systems - Answer -Carbon Steel
___ fittings are typically used in hydraulic equipment when attaching tubing to a hose. -
Answer -flared
,The velocity of fluid flow increases at any restriction in the piping if the ___ remains the
same in the system - Answer -Flow Rate
A(n) ___ is a metal sleeve used for joining one piece of tubing to another - Answer -
Ferrule
A(n) ____ is a piece of pipe that is used to interconnect pipes and allows them to
change direction - Answer -Pipe Fitting
The bending radius of flexible hose must be greater than ___ times its ID. - Answer -Six
The ___ of fluid flow must increase at any restriction to maintain constant flow rate -
Answer -velocity
A(n) ___ fitting is a tubing fitting in which the end is spread outward - Answer -flared
Pressure spikes that occur within a hydraulic system can be as high as ___% of the
operating pressure. - Answer -50
the two types of ___ used in hydraulic system are black and stainless steel - Answer -
piping
All hydraulic hoses are constructed with a minimum of ___ layers - Answer -Three
A(n) ___ mark can be used on a nut to avoid under or overtightening certain
components - Answer -Witness
___ is a method of removing scale and rust from metal through chemical treatment -
Answer -Pickling
Piping is available in standard sizing with ODs up to ___" - Answer -12
Tubing installed in a hydraulic system cannot be threaded - Answer -True
The lower a pipe schedule number, the smaller the ID of the pipe - Answer -False, The
higher the schedule number the smaller the ID
Galvanized pipe should not be used with hydraulic systems - Answer -True, it will
degrade the hydraulic fluid. it can only be used in pneumatic systems
Hydraulic and pneumatic pipes each require the same amount of support in a fluid
power system - Answer -False, hydraulic systems require more support because they
are normally larger in size and are under higher pressures
AA 45 degree angle should not be used for high-pressure hydraulic systems - Answer -
True
, Pipes that are bolted to flanges do not require welding at the pipe joint - Answer -False
Flow velocity in a pipe is related to the area of its inside diameter - Answer -True
When applying pipe thread sealant, the last few threads at the end of the pipe should
not have any sealant applied to them. - Answer -True
Piping sections in a hydraulic system can only be connected together through welding -
Answer -False
Once a fluid is flowing, its speed never changes - Answer -False
A nonpositive seal is a type of seal that does not allow any amount of fluid leakage -
Answer -False, allows a certain amount of fluid to leak which provides a lubricating film
between surfaces. a positive seal doesnt allow leakage
Tubing is more commonly used in hydraulic systems than in pneumatic systems -
Answer -True
Fluid travels at a higher velocity through large diameter piping than it does through low
diameter piping - Answer -False, It will actually move slower
Straight pipe threads are preferred over tapered pipe threads because of the reduced
possibility of leakage - Answer -True
The difference between fluid flow(gpm) and velocity(fps) is that fluid flow is distance per
unit time, while velocity is volume per unit time - Answer -False, fluid flow is volume per
unit time, and velocity is distance per unit time
In a directional control valve, port ___ receives fluid flow from the pump, while port ___
returns fluid flow to the reservoir - Answer -P; T
Fixed-displacement pumps are rated by fluid flow and ___. - Answer -Pressure Rating
hydraulic pump types include gear, vane, and ___ pumps - Answer -Piston
___ is a localized gaseous condition within a stream of fluid that occurs when pressure
is rediced to vapor pressure - Answer -Cavitation
A lobe pump requires ___ to drive the lobe-shaped driven gears - Answer -
A(n) ___- center position directional control valve allows allows a hydraulic system to
operate with more than one actuator and with each actuator operating independently of
the others - Answer -Closed
