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WorksheetsHydraulics week 8.2
Total questions: 23
Worksheet time: 8mins
Hydraulic filters are generally categorized according to the:
Material Used
Mesh Size
Maximum Working pressure
Filter Size
The _____ valve provides a back pressure to hold a vertical load in place until certain pressure requirements are met.
Unloading
Pressure-Reducing
Brake
Counterbalance
Gas Charged accumulators are most commonly charged with ______ as the inert charge gas.
Hydrogen
Shop Air
Oxygen
Nitrogen
Farts
If we know the hydraulic system working pressure and the area of the cylinder, what can we determine?
The number of cylinders required
The mechanical advantage
The maximum weight the cylinder can lift
The ammount of efficiency losses
What is NOT an advantage of petroleum-based hydraulic fluids?
Low Cost
Good Lubricity
Fire-Resistant
Low Toxicity
Which is the most common directional control valve mechanism for hydraulic applications?
Spool Type
Sliding Plate
Rotating Plate
Cartridge
Injection
What pressure control Valve is used to control the order of operation of other actuators in the system?
Unloading Valves
Counterbalance Valves
Sequencing Valves
Numbering Valves
Which is NOT a function of a hydraulic accumulator?
Providing fluid flow to supplement the pump output in order to increase actuator speed
Recharging during low demand periods
providing a pressure source to hold loads in place if the pump is hut down
Limiting the maximum pressure that can occur in a portion or branch of the system
Power steering pump
Air Compressor
Injector Pump
Water Pump
Air Governor
Dry Sweep/Oil Dry
Cat Litter
Grape Nuts
Pig Mat
Yoga Mat
A Cylinder with Stroke of 31 inches, and a diameter of 7.2 inches.
What is the volume in Cubic Feet?
1.7
.67
1.2
.73
.92
A hydraulic Circuit with a flow of 330 Gallons Per Minute and a Pressure of 140 pounds per Square Inch.... How many horsepower is it capable of?
26.95
44.35
30.26
51.5
20.74
A reservoir with external dimensions: 16" wide, 18.5" tall, and a sidewall 4.5" at the top and 9" at the bottom with a wall thickness of 1/8". How much fluid can it hold in cubic feet?
2.1
1.36
1.54
1.12
.98
Kinematic viscosity is
Measured in (a)
SUS:
Secondary Universal Suspension
Saybolt Universal Seconds
Seabolt Underhung Scale
Sensing Underspeed Scale
Suspended Underslung Scale
Dynamic Viscosity
Measured in poise, centipoise (cP), or (a)
Fluid’s oxidation rate = doubles for every __°F (10°C) that fluid temperature rises above recommended operating temperature
14
16
17
18
20
_________ additives that help to separate water from oil.
Demulsifier
Deairation
Desiccanting
Emulsifying
Pro-Biotic
___________ is:
Ratio between weight of fluid and weight of water
Bulk Modulus
Hysterisis
Specific Gravity
Dynamic Viscosity
Toxicity
An oil must meet toxicity specifications or be __% biodegradable in order to be classified by the ISO as an environmentally acceptable hydraulic fluid.
50
60
70
75
80
Dynamic viscosity, also known as (a) , measures the force it takes to make a fluid move.
A high cSt or SUS indicates a __________ oil.
High Temperature
Low Temp
Contaminated
Thick
Thin
The specific gravity of Rapeseed Oil:
.92
.83
.93
.97
.82
