Font size
WorksheetsHydraulics
Total questions: 32
Worksheet time: 1hrs 4mins
List three functions of a hydraulic tank
Store oil
Release heat
Deaerate oil
Increase flow
List two reasons why hydraulic tanks are sometimes pressurised.
Give pump good head of oil
Help cooling
Create cavitation
Reduce contamination
What must you do before working under a hydraulically suspended load?
Lower load if you can
Engage safety brace
Support load mechanically
All of the answers are correct
List two ways contamination can enter a hydraulic tank.
When topping up
Pump
Through breather
Motors
What does a Safety Data Sheet tell you?
First aid for personal exposure
First aid for firefighting
First aid for environmental spills
All of the answers are correct
What ways can pressure is produced in a hydraulic system?
Heat, load, accumulator
Load, pump, accumulator
Pump, load, directional control valve
All of the options are correct
Before servicing a hydraulic system what three steps must you take before starting work?
JSEA Risk assessment
Isolation
Safety Data Sheet
Depressurise
Which 20 micron filter below has a better Beta rating?
20/ 100
20/ 5
20/ 20
20/ 1000
Which ISO cleanliness code below has the most 14um particles?
18/16/13
21/19/18
17/16/11
18/14/15
With regard to safety, before removing an oil filter on a hydraulic system, what should you check?
Oil level
Tank pressurised
Type of oil
Part number
Where can hydraulic filters be positioned in a system?
Low pressure side
High pressure side
Return side
All of the answers are correct
How does viscosity of a fluid change with higher temperatures?
Increases
Remains constant
Decreases
Which fluid viscosity index is the most stable?
0
20
50
95
What purpose would a filter have a bypass valve?
To reduce the chance of implosion
To reduce the chance of damage due to a blocked filter
Reduce contamination
Reduce cavitation
If hydraulic oil is spilled while servicing a machine what should you do?
Bund area with spill kit, clean up spill
Report spill
Dispose of spill waste correctly
All of the answers are correct
How should waste oil & filters be disposed of after servicing?
In general waste
Bury in tip
Recycle using appropriate containers
Which symbol represents a shell & tube hydraulic oil cooler?
A
B
C
D
What type of hydraulic heat exchanger is most commonly used on mobile equipment?
Air to oil
Water to oil
Oil to oil
All of the answers are correct
Where should oil coolers be positioned in a hydraulic system?
Suction side
Pressure side
Return side
All of the answers are correct
Before checking the hydraulic tank level what should you consider?
Level of machine
Implement positions
Temperature of the system
All of the answers are correct
Why can a hydraulic accumulator be fitted into a hydraulic circuit?
Brakes
Steering
Pressure spikes
All of the answers are correct
The “dash” number on flexible hydraulic hose identifies the?
Date and year of manufacture
Pressure rating (low, medium, high or very high)
Specification identification (JIC, BSP, SAE etc.)
Nominal internal diameter of the hose
When fitting steel tubing in a hydraulic system, what should you consider? (multiple answers)
Leave room for expansion and contraction
Sweeping bends to reduce turbulent flow
Leave unclamped to give movement
Tight bends to reduce size
What two things can you put over a hose to protect from failure? (multiple answers)
Whip check
Tape
Burst sleeve
Clamp
Stamped is a way to remember what to consider when ordering a hydraulic hose what are two of these listed below? (multiple answers)
Pressure
Angle
Size
Environment
What is the colour of low pressure in a hydraulic schematic?
Red
Blue
Purple
Green
What two components could you change to improve this system? (multiple answers)
Variable pump
Open centre
Tandem centre
Bi-directional pump
What are two of the most common hydraulic viscosity’s used? (multiple answers)
100
46
68
140
In an open loop system which part would have the highest velocity of fluid?
Suction
Return
Pressure
All the same
Why are the suction lines made bigger with slower velocity?
Reduce aeration
Reduce cavitation
More flow
All of the answers are correct
Pascals Law states that: 'pressure on a trapped fluid is transmitted equally throughout the fluid'.
True
False
None of the answers are correct
All of the answers are correct
What component separates the two compartments of a double acting differential type cylinder?
Piston
Gland
Rod
All of the answers are correct
