TPC 308

Question 1

To what type of energy does a hydraulic system convert electrical energy?

Answer 1

Usable

Question 2

What is the function of a control valve in a hydraulic system?

Answer 2

Directs fluid
Regulates pressure
Regulates flow

Question 3

The hydraulic fluid in a system must be able to transmit power and:

Answer 3

Lubricate the system

Question 4

Before working on a hydraulic system, the most important requirement is to:

Answer 4

Understand the system’s operation

Question 5

If a hydraulic system is to function properly, it must:

Answer 5

Have all components installed correctly

Question 6

Which of the following types of drawings illustrate the general location and appearance of a system’s elements?

Answer 6

Pictorial

Question 7

What type of drawing illustrates the elements that make up a hydraulic system?

Answer 7

Schematic

Question 8

On a schematic drawing, hydraulic components are represented by:

Answer 8

Symbols

Question 9

The first thing to do when you read a schematic of a hydraulic system is to:

Answer 9

Obtain an overall view of the system

Question 10

A schematic drawing of a hydraulic control valve illustrates fluid flow and:

Answer 10

Valve function

Question 11

When installing hydraulic components, you should follow the installation techniques that:

Answer 11

Are required for each component

Question 12

In order to provide proper alignment between a hydraulic pump and the driving motor, you should always:

Answer 12

Provide a flexible coupling

Question 13

Which of these procedures should be followed when starting a newly installed pump?

Answer 13

Jog the drive motor

Question 14

A stack of hydraulic control valves held together by bolts is called a:

Answer 14

Manifold

Question 15

Which of the following statements about installing solenoid valves is NOT true?

Answer 15

Clip off the leads at the valve

Question 16

Pump suction or inlet pipes should always be equal to or larger than the:

Answer 16

Pump intake

Question 17

Which of the following must be considered when selecting hydraulic tubing?

Answer 17

Material
Tube ID
Wall thickness

Question 18

Which of the following should be avoided when assembling tubing?

Answer 18

Straight line connections

Question 19

The disadvantage of using hydraulic hose in a hydraulic system is that it:

Answer 19

Wears out more quickly than tubing

Question 20

Which of the following best describes most seals used in hydraulic components?

Answer 20

Preformed

Question 21

What is the primary function of a hydraulic fluid?

Answer 21

Transmit force and energy

Question 22

The lubricating capability of a hydraulic fluid is dependent mostly upon its:

Answer 22

Viscosity

Question 23

Which of the following items affects hydraulic fluid viscosity the most?

Answer 23

Temperature

Question 24

When you select a hydraulic fluid, always make sure it is:

Answer 24

Compatible with the system

Question 25

Before filling a hydraulic system with hydraulic fluid always make sure of the:

Answer 25

System being clean

Question 26

The interval of time between inspections on a specific hydraulic system depends on the:

Answer 26

Type of system

Question 27

Because inspections are made to locate trouble before a breakdown occurs, they are classified as:

Answer 27

Preventative maintenance

Question 28

After how many operating hours should the fluid in a hydraulic system be sent out for laboratory analysis?

Answer 28

1,000 hours

Question 29

In many cases, repair maintenance can be scheduled for a later time. Under what conditions should this procedure NOT be followed?

Answer 29

When safety hazards exist

Question 30

When should hydraulic system elements be re-conditioned?

Answer 30

Periodically and whenever they breakdown

Question 31

Troubleshooting is best described as a means of determining trouble in a system by:

Answer 31

Means of logical sequence

Question 32

Prior to troubleshooting a hydraulic system, you should first evaluate the symptoms and then:

Answer 32

Determine the cause

Question 33

The best way to protect a pressure gauge from surges is by:

Answer 33

Using a snubber with the gauge

Question 34

When are fluid flowmeters or gauges most commonly used in a hydraulic system?

Answer 34

During testing

Question 35

Which of the following documents is the most helpful in solving a hydraulic system problem?

Answer 35

Maintenance record

Question 36

The best way to determine if a valve is the cause of a system malfunction is to:

Answer 36

Test the circuit

Question 37

Whenever a valve is disassembled for inspection or repair, you should always:

Answer 37

Replace the seals

Question 38

Which of the following causes sludge formation?

Answer 38

Overheating of hydraulic fluid

Question 39

Which of the following could cause solenoid-coil burnout in a directional control valve?

Answer 39

Bent valve linkage Contaminants in the valve Excessive current flow

Question 40

Which of the following tells how directional control valves should always be re-assembled?

Answer 40

Carefully

Question 41

Cylinder rod misalignment is usually caused by:

Answer 41

Side loading

Question 42

A probable cause of an immovable or slow moving cylinder may be:

Answer 42

A blocked speed control valve

Question 43

Which of the following hydraulic fluids is suitable for fire-resistant applications?

Answer 43

Water based fluids Emulsions Phosphate esters

Question 44

Before connecting a cylinder to the hydraulic system, you should first:

Answer 44

Clean the piping system

Question 45

Which of the following items is essential to proper cylinder performance?

Answer 45

Accurate mounting

Question 46

Visual inspection of an operating hydraulic pump or motor is limited because:

Answer 46

You cannot see the internal parts

Question 47

Broken pump rotors, fractured teeth or vanes and repeated seal blowout are usually caused by:

Answer 47

Pressure shocks

Question 48

Excessive wear and roughness in a gear pump are indications of:

Answer 48

Solid contaminants in the system

Question 49

It is important to keep all contaminants out of piston pumps because of the pump's:

Answer 49

Close-tolerance construction

Question 50

It is good maintenance practice to replace which of the following when a hydraulic pump is repaired?

Answer 50

Anti-friction bearings Gaskets Seals