Basic Hydraulics(GLMN0897)
Terms
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- A three-way valve is identified by its three
- Paths
- A cylinder in which the retracting stroke is the power stroke is called a
- Pull-type cylinder
- Which of the following kinds of valves should be used in a hydraulic system to change the direction of motion of the cylinder?
- Directional control valve
- When a hydraulic cylinder is added to an existing system, be sure that the
- Pump capacity is adaquate
- Which of the following, when added to hydraulic fluid, will limit oxidation?
- A chemical inhibitor
- According to Bernoulli's Principle, when fluid flow increases in a system, the pressure
- Decreases
- Internal leakage in hydraulic gear motor is held to a minimum by the use of
- Wear plates
- To maintain the tempurature of a hydraulic fluid effectively, the reservoir should have
- Thin walls
- An air breather is installed on a fluid reservoir to
- Vent the reservoir
- Fluid pressure in one section of a hydraulic system is limited by a
- Reducing valve
- The seperation of contaminants from hydraulic fluid in a reservoir is aided by
- Slow fluid movement
- The best method of controlling hydraulic fluid contamination is the use of
- Good maintenance procedures
- Straight-line mechanical force is created by a
- Hydraulic cylinder
- The closing force of a direct-acting solenoid valve is approximately
- 15 lbs
- The flow rate of hydraulic fluid through piping or tubing is measured in
- gpm
- What is used in a hydraulic reservoir to aid in cooling?
- A baffle
- Which of the following statements about hydraulic motors is true?
- They are all positive-displacement types
- Surface filter media made of sintered metal powders are used in high-pressure systems because of their
- Thick mass
- The ability of a filter or strainer to remove 100% of the contaminant particules of a particular size from a hydraulic fluid is called its
- Absolute rating
- A cresent-shaped seperator is used on some ________ gear motors
- Internal
- Internal gear pumps normally are used in applications that have
- Pressures of less than 1000 psi
- The overall efficiency of a hydraulic motor is defined as the
- Output horsepower divided by the fluid input
- The purpose of a filter in a hydraulic system is to
- Remove small contaminants
- A four-way valve that can operate in three positions is called a
- Closed crossover valve
- A disadvantage of using hose in hydraulic systems instead of piping or tubing is that the hose
- Is less permanant
- Pressure is measured in __________ in the English system
- Pounds per square inch
- A meter-out flow-control valve is used to regulate fluid flow from a(n)
- Actuator
- The operating differental pressure of a relief valve is the difference between its maximum pressure and the
- Cracking pressure
- The construction of a spool valve caused it to
- Be partially balanced
- Pump capacity is rated in all of the following terms EXCEPT
- Pounds per square inch
- A hydraulic fluid must be able to do all of the following EXCEPT
- Compress easily
- The pressure range of a hydraulic motor may vary from
- 100 to 5000 psi
- A hydraulic fluid the exhibits little change in viscosity when heated is said to have a high
- viscosity index
- Mechanical shock is controlled in a hydraulic cylinder by means of a
- Cushioning device
- Which of the following is NOT a type of gear pump?
- Vane
- Pressure loss in a hydraulic line depends on the
- Flow velocity
- The force exerted by a double-acting piston is
- Less on the rod side
- A shock suppessor is used in a hydraulic system as
- Protection against pressure surges
- Peak hydraulic system demands are usually met by the use of a(n)
- Accumulator
- Which of the following is NOT needed in order to calculate the work a hydraulic cylinder can do?
- Power
- The ratio of the actual delivery rate of a pump to its displacement is its
- Volumetric efficiency
- The ability of a fluid to penetrate into small clearances between closely fitted parts is determined by the fluid's
- Viscosity
- Depth filters do NOT
- have a long service life
- Safe working pressures of hydraulic piping are based on providing a safety factor of
- 6
- When the maximum allowable pressure drop of a filter is reached, the filter will
- Allow particules to pass through the medium
- What characteristic of a fluid does the term "specific gravity" descibe?
- Density
- Pascal's law states that pressure exerted on a confined liquid
- is distributed equally throughout the liquid
- The flow from the outlet of a sequence valve is at
- Line pressure
- Hydraulic lines should NEVER be constructed of
- Galvanized pipe
- The resistance of a hydraulic system to fluid flow causes
- Pressure