MMET 401 TEST 2 QUESTIONS AND
ANSWERS ALL CORRECT
T/F: External gear motors are the most efficient and least expensive type of gear motor
- Answer- False
T/F: Packing must be compressed enough to allow minimal hydraulic fluid leaks
between moving and stationary parts - Answer- True
T/F: All hydraulic motors produce rotation because of the pressure differential of the
internal gears, vanes, or pistons at inlet and outlet ports of the motor - Answer- True
T/F: O-rings are typically used with rotating parts or in equipment that could be exposed
to vibration - Answer- False
T/F: Duplex cylinders have the same assembly as tandem cylinders, but the rods are
connected together - Answer- False
T/F: U-ring seals are used in low-pressure applications or high pressure applications -
Answer- True
T/F: A positive cylinder seal allows a small amount of hydraulic fluid to pass to provide
lubrication between mating surfaces - Answer- False
T/F: Tandem cylinders allow two cylinders to move together - Answer- True
T/F: Quad-rings require back-up rings for pressures of about 1000 psi and higher -
Answer- True
T/F: Cup seals include V-ring and U-ring seals - Answer- True
T/F: Most single-acting cylinders have a cap-end vent that allows air to enter and
escape from the cap end of the cylinder - Answer- False
T/F: Rod wipers work best in extremely dirty environments - Answer- False
T/F: A cylinder cushion us adjusted by operating the cylinder and rotating the needle
valve adjustment screws - Answer- True
, T/F: A double-acting cylinder can produce force in both directions - Answer- True
T/F: Teflon is used as a bearing material because it has low-friction properties - Answer-
False
T/F: A ram cylinder has only one chamber in the cylinder barrel and provides force in
two directions - Answer- False
T/F: When an O-ring is installed on an actuator that receives pressure from both
directions, bac-up rings must be installed on both sides of the O-ring - Answer- True
T/F: Cylinder stop tubes are only used on cylinders with long horizontal rods over 36" in
length - Answer- False
T/F: Telescoping ram cylinders can have up to five stages and extend up to 30' -
Answer- true
T/F: Bleed-off systems are used when more flow control accuracy and less system
efficiency is required - Answer- False
T/F: To control the piston speed of a double-acting cylinder during retraction by using
meter-in, a flow control valve is attached to the rod end of the cylinder - Answer- True
T/F: Two-position, two-way directional control valves can turn on and off separate
components of systems that are powered by the same hydraulic unit - Answer- True
T/F: Most directional control valves used in industrial applications have two, three, or
four positions, but some can have five or six positions - Answer- True
T/F: Three-position, four-way directional control valves can only control one direction of
fluid flow at a time - Answer- False
T/F: Internal arrows on a hydraulic schematic diagram can be either colored solid or
outlines - Answer- False
T/F: On a three-position directional control valve, both sides of the spool have springs to
center spool for normal condition - Answer- True
T/F: An AND logic valve allows fluid flow out of the valve when pressure is present on
input 1 and input 2 - Answer- True
T/F: A shuttle valve is also known as an AND logic - Answer- False
T/F: Right angle check valves are installed mainly in hydraulic systems, rather than
pneumatic systems - Answer- True
ANSWERS ALL CORRECT
T/F: External gear motors are the most efficient and least expensive type of gear motor
- Answer- False
T/F: Packing must be compressed enough to allow minimal hydraulic fluid leaks
between moving and stationary parts - Answer- True
T/F: All hydraulic motors produce rotation because of the pressure differential of the
internal gears, vanes, or pistons at inlet and outlet ports of the motor - Answer- True
T/F: O-rings are typically used with rotating parts or in equipment that could be exposed
to vibration - Answer- False
T/F: Duplex cylinders have the same assembly as tandem cylinders, but the rods are
connected together - Answer- False
T/F: U-ring seals are used in low-pressure applications or high pressure applications -
Answer- True
T/F: A positive cylinder seal allows a small amount of hydraulic fluid to pass to provide
lubrication between mating surfaces - Answer- False
T/F: Tandem cylinders allow two cylinders to move together - Answer- True
T/F: Quad-rings require back-up rings for pressures of about 1000 psi and higher -
Answer- True
T/F: Cup seals include V-ring and U-ring seals - Answer- True
T/F: Most single-acting cylinders have a cap-end vent that allows air to enter and
escape from the cap end of the cylinder - Answer- False
T/F: Rod wipers work best in extremely dirty environments - Answer- False
T/F: A cylinder cushion us adjusted by operating the cylinder and rotating the needle
valve adjustment screws - Answer- True
, T/F: A double-acting cylinder can produce force in both directions - Answer- True
T/F: Teflon is used as a bearing material because it has low-friction properties - Answer-
False
T/F: A ram cylinder has only one chamber in the cylinder barrel and provides force in
two directions - Answer- False
T/F: When an O-ring is installed on an actuator that receives pressure from both
directions, bac-up rings must be installed on both sides of the O-ring - Answer- True
T/F: Cylinder stop tubes are only used on cylinders with long horizontal rods over 36" in
length - Answer- False
T/F: Telescoping ram cylinders can have up to five stages and extend up to 30' -
Answer- true
T/F: Bleed-off systems are used when more flow control accuracy and less system
efficiency is required - Answer- False
T/F: To control the piston speed of a double-acting cylinder during retraction by using
meter-in, a flow control valve is attached to the rod end of the cylinder - Answer- True
T/F: Two-position, two-way directional control valves can turn on and off separate
components of systems that are powered by the same hydraulic unit - Answer- True
T/F: Most directional control valves used in industrial applications have two, three, or
four positions, but some can have five or six positions - Answer- True
T/F: Three-position, four-way directional control valves can only control one direction of
fluid flow at a time - Answer- False
T/F: Internal arrows on a hydraulic schematic diagram can be either colored solid or
outlines - Answer- False
T/F: On a three-position directional control valve, both sides of the spool have springs to
center spool for normal condition - Answer- True
T/F: An AND logic valve allows fluid flow out of the valve when pressure is present on
input 1 and input 2 - Answer- True
T/F: A shuttle valve is also known as an AND logic - Answer- False
T/F: Right angle check valves are installed mainly in hydraulic systems, rather than
pneumatic systems - Answer- True
