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Flashcards in Hydraulics Deck (55):
1

The hydraulic press is an example of what law?

Pascal's law

2

T/F a smaller weight can move a larger weight with a lever but the lever must move a greater distance

True

3

Force can be measured in what?

Pounds

4

Increasing force in a hydraulic system causes what?

Pressure to increase

5

Pascals law explains how:
Fluid stays in a barrel
A small jack can lift a two ton car
An oil tanker floats
To calculate the force of gravity

A small jack can lift a two ton car

6

T/F Pascal's law states that any change in pressure in an enclosed fluid is applied equally to all the fluid in the enclosure

True

7

What innovation allowed hydraulic technology to explode and be used in practical ways for the first time?
Force pump
Aqueduct
Steam shovel
High pressure hose

High pressure hose

8

What is pressure?
Weight of an object
Force acting on a given area
The area of a pair of snowshoes
Gravity

Force acting on a given area

9

T/F A 4/3 way DCV relieves fluid pressure.

False

10

T/F double acting cylinders can only apply force in one direction

False

11

T/F Hydraulic systems use oil rather than water because its self lubricating, has more viscosity and doesnt lose energy

True

12

Single acting cylinders apply force in:
Only One direction
Two directions
All directions
Multiple directions

Only one direction

13

T/F The filter removes impurities from the oil to allow the hydraulic system to work at maximum efficiency

True

14

The hydraulic system pulls this component from the reservior:
Electricity
Fluid
Coolant
Contaminants

Fluid

15

T/F The pressure relief valve maintains the minimum pressure in the hydraulic circuit

False

16

The purpose of the hydraulic system is to perform work in the real world. What component actually performs this work?
Pump
Reservoir
Actuator
Accumulator

Actuator

17

The schematic symbol for a flow line is:
An upside down triangle
The letter "E" lying flat
A diamond with a dotted line through it
A straight horizontal line

A straight horizontal line

18

Which component allows an actuator to maintain its pressure even after the pump stops?
Directional control valve
Check valve
Reservoir
Hose

Check valve

19

This component stores energy in the form of pressurized gas:
Accumulator
Actuator
Pump
Reservoir

Accumulator

20

This valve has two ports and two switching positions, allowing fluid to flow both ways through the valve:
3/2 way valve
4/2 way valve
4/3 way valve
2/2 way valve

2/2 way valve

21

What is fluid movement called?
Flow
Pressure
Resistance
Energy

Flow

22

Which type of machine removes material from a workpiece by pushing or pulling a tool with teeth through the material?
Stamping machine
Foraging machine
Broaching machine
Workholding machine

Broaching machine

23

T/F Before performing system maintenance, you should work the valves in all positions

True

24

Before working or performing maintainence on any hydraulic system, first allow the system to do what?
Warm up
Cool completely
Run for several hours
Never perform maintainence on a system

Cool completely

25

How long should you wait for the hydraulic system to cool down after operation?
10 minutes
30 minutes
45 minutes
1 hour or more

1 hour or more

26

T/F if a high pressure hose breaks, it can continue flailing even when the pump has stopped operating.

True

27

T/F The accumulator can hold pressure to operating levels even when the pump isn't running.

True

28

The best way to check for a pinhole leak is
With your hand
With your arm
With a piece of wood or cardboard
To examine the hose

With a piece of wood or cardboard

29

T/F The most important concern when working in any type of manufacturing is safety

True

30

What is one thing you should not do during operation of a hydraulic system?
Service the system
Turn the system off
Follow the operating manual
Call your supervisor

Service the system

31

What should you do if you think you've recived a pinhole leak injury?
Seek medical attention immediately
Put a bandage on it
Ignore it
Wash the area and return to work

Seek medical attention immediately

32

What should you do when a high pressure hose fails and begins leaking
Break for lunch
Tell your coworkers
Press the E stop button
Repair the problem yourself

Press the E stop button

33

Always report any problems you find to:
Your supervisor
The maintenance team
Your coworkers
Research and development

The maintenance team

34

Checking the oil cooler and the heat exchanger to see if theyre working means that youre looking for what type of problem?
Low fluid
Low pressure
Pump failure
Burning smells

Burning smells

35

T/F following a maintenance program is the most effective way to prolong system life.

True

36

T/F Its a good idea to listen for unusual sounds from the system pump and report them to maintenance

True

37

Most contaminants, such as dirt, dust, debris, and water, enter the hydraulic system through the:
Reservoir
Valves
Filters
Dipstick

Reservoir

38

T/F No matter how careful you are, normal operations will admit some contaminants into the hydraulic system

True

39

What types of areas on cylinders and valves indicate leaks?
Dry clean areas
Wet or dirty areas
Pinched areas
Hot areas

Wet or dirty areas

40

To perform an out of circuit test, a component can be placed on a
Reservoir
Calibration tester
Test bench
Work cell

Test bench

41

When working around hydraulic equipment:
Wear loose fitting clothes
Wear canvas shoes
Remove any rings
Wear long sleeves

Remove any rings

42

Before you bleed the system pressure during troubleshooting:
Check the pump flow rate
Check the system pressure
Remove all shields
Support any overrunning loads

Support any overrunning loads

43

_____ test ports allow you to take pressure measurements without breaking into a hydraulic line to install a tee
Line
System
In line
Valve

Valve

44

An increase in flow from the _____ can indicate excessive wear
Outlet of an actuator
Pump
Case drain
Motor

Case drain

45

Which method of flow measurement requires a shutoff valve to divert flow from the system through the flow meter?
Inline
Bypass
Isolation
Reroute

Bypass

46

A pressure change problem in a multiple pressure circuit is a _____ related fault.
Machine sequence
Machine performance
System
Machine execution

Machine sequence

47

Which of these forms of system level troubleshooting do experts recommend against using?
Symptom and cause
Half-split
Output back
Shotgun

Shotgun

48

Worn _____ in a cylinder can allow leakage that can result in slow actuator speed.
Cushions
Seals
Reverse flow checks
Sleeves

Seals

49

Fast actuator speed can by flow control valves, relief valves, and:
Pumps
POC valves
Counterbalance valves
DCVs

Pumps

50

T/F one of the major causes of incorrect deceleration is misadjustment of the deceleration components

True

51

What percent of all hydraulically powered machine downtime and malfunctions are due to contamination in the fluid?

More than 50%

52

The most common location for a filter is in the _____, where the filter cleans all fluid returning to the reservoir.
Pump
Main Return line
Motor
Reservoir

Main return line

53

A(n) _____ filter has a filter element enclosed inside a metal shield.
Spin-on
Cartridge-type
Suction strainer
Pump

Cartridge-type

54

A(n) _____ is a device used in the suction line of a hydraulic system to remove contaminating particles
Spin-on filter
Suction Strainer
Cartridge-type filter
Reservoir

Suction strainer

55

As a filter collects dirt, the _____ difference will grow, indicating that it is time to clean or replace the filter
Pressure
Volume
Flow
Dissolved solids

Pressure