Font size
WorksheetsIDMHS
Total questions: 54
Worksheet time: 29mins
1) A single hydraulic leak of one drop per second is equal to how much oil in a one year period?
420
220
520
320
2. Which of these tools is not used for testing hydraulic systems?
Deadweight Tester
Tachometer
Stroboscope
Leak test kit
What are expansion loops fitted?
To prevent damage caused by expansion
To prevent leakage due to high pressure
To prevent damage caused by vibration
To prevent turbulence caused by vibration
How close should a spill kit be before work commences?
Within 200 meters
On the same plant
In the immediate vicinity
Within 100 meters
Force = what?
Height x Width
Pressure – Area
Pressure x Area
Atmospheric pressure x 3.142
Pressure gauges are powered by?
The pressure being measured
A direct drive from the system pump
Batteries
Solar power
What is the description of this valve?
4 way 4 position
4 way 3 position
3 way 3 position
A pressure sensor is a device which senses pressure and converts it into an analogue electric signal whose .................. depends upon the pressure applied
Magnitude
Magnification
Temperature
Flow
A check valve allows fluid to flow in?
One direction
Both directions
Who said Pressure applied in a confined fluid is transmitted undiminished in all directions, and acts with equal force on equal areas and at right angles to them?
Boyle
Bourdon
Pascal
Charles
Identify the following symbol
Detent
Foot Pedal
Solenoid
Push Pull lever
Actuator seals perform which three basic functions?
Lubricate
Resist extrusion
Seal
Adjust to clearance gap changes
Which valve could be used to control the speed of an actuator?
Pressure relief valve
Directional control valve
Flow control valve
Pressure control valve
What is the percentage of hydraulic systems that fail due to contaminated or ageing oil?
0.8
0.7
0.65
0.75
Level measurement devices can only be used in small reservoirs?
True
False
Which of these are good properties of hydraulic oil?
Low tendency to cavitate
Nice odor
Total water rejection
Hydrolytic stability
How many gears does a gear pump normally have?
1
2
3
4
Sequence valves could be used for?
Ensuring drain oil is returned to tank
Checking the temperature of the system
That a cylinder is fully extended before another starts it stroke
Ensuring the pump runs in the right direction
Screw pumps normally come in which configurations?
Single
Double
Triple
Identify the following symbol
Hydraulic Motor Variable Displacement
Pneumatic Pump Variable Displacement
Hydraulic Pump Fixed Displacement
Hydraulic Pump Variable Displacement
What are the two main types of vibration monitoring equipment?
Portable
Floating
Fixed
Flexible
Identify the following symbol
Automatic Sequence Valve
Pressure Relief Valve
Check Valve
Directional Control Valve
The pressure line in a circuit does what?
Actuates hydraulic components
Carries the major flow of oil
Carries leakage oil back to the reservoir
Which statement is true regarding radial piston pumps?
The cam belt operates the valves
Cylinders are perpendicular to the shaft
The pumping cycle is over four strokes
The fluid is expelled out of the piston
Which of these answers is a hydraulic tank not designed to do?
Help cool the oil
Allow trapped air to escape
Allows fluid expansion
Provides the gas for the accumulator
In Hydraulics what medium is usually used to transmit power?
Gas
Oil
Nitrogen
Gear Systems
When commencing work on a hydraulic unit what would you do if you found someone working in immediate Vicinity?
Nothing
Ask them to assist
Inform them of the work about to start
Tell them to take a break
Which valve could be used if a component wasn't designed to take the full system pressure?
Pressure relief valve
Pressure control valve
Flow control valve
Directional control valve
Name the three types of accumulators that can be used in hydraulics?
Pistons
Centrifugal
Diaphragm
Bladder
Which of these are not normally operated by a hand pump?
Pulling equipment
Manually operated fork lift
Jacks
Automated plant
Directional control valves can be classified by?
Number of ports
Number of Positions
How many are in a circuit
Type of Spool
Identify the following symbol
Pressure Switch
Pressure Compensated
Accumulator Spring Loaded
Push Button
The pilot line in a circuit does what?
Carries leakage oil back to the reservoir
Actuates hydraulic components
Carries the major flow of oil
Identify the following symbol
Cylinder, Double Acting - Double End Rod
Cylinder, single acting
Cylinder, Double Acting - Single End Rod
Cylinder, Double Acting Differential Piston
Identify the following symbol
Filter, Strainer
Heater
Cooler
Temperature Controller
When refilling an oil reservoir which type of oil should be used?
Oil drained from another system
The recommended oil
Any oil
When the rotary motion required is two turns or less which component is used?
Cylinder
Pump
Motor
Rotary actuator
With regard to position monitoring which of these displays the position of a valve?
Switch
Linear
Height
Rotary
Hydraulic power can provide both?
Rotary and straight line movement
Straight line and erratic movement
Resistance and overload protection
Heat and a cooling effect
Who observed that a small force on a small area would create a proportionally larger force on a larger area?
Ohms
Bramah
Pascal
Newton
What is the main reason for heating the hydraulic oil in system reservoirs?
To prevent cavitation in the pump
To prevent the oil from freezing
To assist with the lubrication
To ensure the oil is warm if you have to handle it
Do liquids have a shape of their own?
Sometimes
Yes
No
Always
Which of these are contained in a swash plate pump?
Double helical rotor
Impellor
Pistons
Diaphragm
What is the main difference between hydraulic pumps and hydraulic motors?
The pump can also be a motor
A motor can usually run in both directions
A motor only runs in one direction
The drain line in a circuit does what?
Carries leakage oil back to the reservoir
Actuates hydraulic components
Carries the major flow of oil
Flow meters are used to?
Assess the performance of a system
Assess the temperature of a system
Connect ancillary components to a system
Assess the vibration of a system
In which hydraulic component would you find a baffle plate?
Swash Plate Pump
Hydraulic Cylinder
Reservoir
Flow Meter
What shouldn't be used to test for hydraulic leaks?
Your hand
Dye
Helium
What does a liquid store when it is compressed?
Energy
Calories
Heat
Resistance to flow
Which of these valves wouldn't be used when setting up for the testing of a hydraulic circuit?
Butterfly valve
Isolation valve
Relief valve
Load Valve
Which of these statements is correct with regards to a vane pump
The vanes are flexible
they can pump abrasive liquids
It is a reciprocating pump
It has a slotted rotor
Is oil incompressible?
No, it can always be compressed.
Almost, some conditions can generate compression.
Yes, it can never be compressed
Only when combined with water
Hydraulic system pipework can be divided into which 2 categories?
Pressure
Flexible
Rigid
Return
Which of these is a major advantage of using a hydraulic system?
Noisy
Availability of different colors
Costly
Self lubricating
