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British Fluid Power Association Qualifications Pre Programme ...

BFPA/Q13































BRITISH FLUID POWER


ASSOCIATION


QUALIFICATIONS



PRE-PROGRAMME










QUESTIONNAIRE – MOBILE


HYDRAULICS (MH3)




Issue
1



2004
BFPA Qualifications – Pre-programme Questionnaire – MH3 BFPA/Q13







NAME:




COMPANY:


DATE:
EMAIL
ADDRESS:





The purpose of this questionnaire is to enable you and the staff at the National Fluid Power Centre
to:

(i)
Identify your existing knowledge level

(ii)
Provide us with sufficient information to enable us to give you guidance and
recommendations towards the best routes of study, enabling you to successfully
complete the written examination.

(iii)
Enables us to formulate the content and subject areas for the one-day modules held at
the NFPC throughout the year.

(iv)
Choose the option which best fits your workload and lifestyle.











PLEASE RETURN THIS COMPLETED QUESTIONNAIRE TO THE DIRECTOR, NATIONAL
FLUID POWER CENTRE 21 DAYS BEFORE THE INDUCTION DATE/S _ _ _ _ _ _ _ _ _ _ _ _


2004

Issue 1
BFPA Qualifications – Pre-programme Questionnaire – MH3 BFPA/Q13


SECTION 1

1)
Give a brief outline of your existing qualifications.





2)
Give a brief outline of your practical experience involving the use and
application of Fluid Power Systems.





3)
Have you studied the content of the Mobile Hydraulics Programme MH3
(BFPA/Q2)?
(Tick
accordingly)
YES
/
NO


4)
Have you read the National Fluid Power Centre INFORMATION SHEET
BPFA Industry Standard Qualifications?




YES / NO


5)
Do you have access to the Website? A great deal of technical information
to support your studies is available
through
the
web.
YES
/
NO


6)
Are you able to commit regular periods for study each week?

YES / NO


7)
Are you able to attend the technical 1-day modules provided by the NFPC
throughout the year? (Normally 5 or 6 days is required to attend all)
YES / NO


8)
Are you aware that you have to attend the NFPC for practical task
preparation and competence based assessment? (Normally up to 4 days
depending upon your ability but we can be flexible.)


YES / NO


2004

Issue 1
BFPA Qualifications – Pre-programme Questionnaire – MH3 BFPA/Q13


SECTION 2 - Technical Knowledge Personal Assessment

It is important at this stage to give a realistic answer. The Level III programme is quite intense and
the examination has a pass mark of 70%. With this in mind please consider your answers carefully
and tick the necessary column. Many of the questions are formulated on the basis of “Can you
explain” - YES / NO.

Fundamental Principles









1)
Can you explain the difference between Cavitation and Aeration?

YES / NO

2)
Could you list 6 causes of cavitation?




YES / NO

3)
Do you know the relationship between Motor Torque, Displacement
and Pressure?







YES / NO

4)
Would you be able to calculate the flow rate from a pump in litres
per minute?








YES / NO

5)
Can you explain the difference between Laminar and Turbulent flow?
YES / NO

6)
Can you explain the term volumetric efficiency associated with a pump?
YES / NO

7)
Can you explain the causes of heat generation in a hydraulic circuit?
YES / NO

8)
Can you explain the term regenerative associated with cylinder operations? YES / NO

9)
Do you know the formula for hydraulic power?



YES / NO

10) Can you explain why fitting a throttle valve on the head end side of a
cylinder
can
lead
to
intensification?
YES
/
NO

Pressure Control

1)
Can you explain the meaning of the term cracking pressure?

YES / NO

2)
Can you explain the difference in performance between:
a) Direct operating relief valve, or

b) Pilot operated two-stage relief valve?




YES / NO

3)
Can you explain the meaning of the term VENT associated with a
two-stage
relief
valve?
YES
/
NO

4)
Can you explain the difference in performance between:
a) Two way pressure reducing valve, or
b) Three way pressure reducing valve?




YES / NO
2004

Issue 1
BFPA Qualifications – Pre-programme Questionnaire – MH3 BFPA/Q13


5)
Can you explain the difference in performance between a 10:1 area ratio
remote pilot counterbalance valve and a 3.5:1 area ratio valve?

YES / NO












6)
Can you explain the performance of a pump unloader valve?

YES / NO

7)
Can you explain the meaning of the term LOAD SENSING?

YES / NO

8)
Can you explain the performance of a proportionally controlled
relief valve?








YES / NO

Flow Control

1)
Can you explain the performance of:
a) A
simple
throttle
valve
YES
/
NO
b) A pressure compensated flow
control
YES
/
NO
c) A priority flow control valve





YES / NO
d) A
rotary
flow
divider
YES
/
NO
e) A
spool
flow
divider YES
/
NO
f) A
differential
lock
unit
YES
/
NO


Direction Control

1)
Can you explain the difference in performance between:
a) Pre-compensation and
b) Post
compensation
(flow
sharing)
YES
/
NO

2)
Can you explain the difference between:
a) Load sensing relief valves, and
b) Port relief valves






YES / NO

3)
Can you explain the difference in flow paths through a valve when

comparing
parallel,
tandem
and
series? YES
/
NO

4)
Can you explain the operation of a joystick used for pilot pressure

control?








YES / NO

5)
Can you explain the difference between a slip in cartridge valve and
a
screw
in
cartridge
valve?
YES
/
NO

6)
Can you explain the difference in construction between a NG6 (ISO 3)

direction control valve and a NG25 (ISO 8) direction control valve?
YES / NO

7)
Can you explain why the lowering of a load may be erratic when using

a pilot operated check valve for control?




YES / NO

8)
Do you know why a ‘Y’ port is fitted to a sequence valve yet not a

relief valve?








YES / NO

9)
Do you know the difference between open centre and closed centre

control?








YES / NO
2004

Issue 1
BFPA Qualifications – Pre-programme Questionnaire – MH3 BFPA/Q13


Hydraulic Fluids

1)
Can you explain the meaning of the terms:
a) Viscosity







YES / NO
b) Viscosity index







YES / NO

2)
Can you explain the difference between a premium grade hydraulic oil

and a VI grade hydraulic oil?





YES / NO












3)
Can
you
explain
the
causes
of:

a) Oxidation







YES / NO
b) Dieseling







YES / NO

4)
New oil may have a code of 17/15, could you explain this term?

YES / NO

Pumps and Pump Controls

1)
Can you explain the difference in operation between a gear pump and

vane
pump?
YES
/
NO

2)
Can you explain the difference in performance using a Q/P curve for
a) Pressure compensated (constant pressure pump), against


b) Pressure
compensated
load
sensing
pump
YES
/
NO

3)
Can you explain the difference in displacement control between an
axial piston swash plate pump and an axial pistol bent axis pump.

YES / NO

Hydrostatic Steering Systems

1)
Can you explain the general layout and performance of an open centre

steering system?







YES / NO

2)
Can you explain the function of the steering priority valve?

YES / NO

3)
Can you explain the difference between Dynamic and Non-dynamic

steering systems?







YES / NO

4)
Can you explain the operation of a dual displacement unit?

YES / NO

5)
Can you explain the difference between a closed centre and open

centre
steering
system?
YES
/
NO
2004

Issue 1
BFPA Qualifications – Pre-programme Questionnaire – MH3 BFPA/Q13


Hydraulic Motor and Actuators (Cylinders)

1)
Can you identify three methods used to increase the torque from a

variable
displacement
motor?
YES
/
NO

2)
Can you explain the principle of operation of a two-speed radial

piston motor?







YES / NO

3)
Can you explain the principle of cylinder
cushioning?
YES
/
NO

4)
Can you explain the difference in hydraulic terms between static and

dynamic
braking?
YES
/
NO

5)
Can you explain the term 140/100 with respect to the configuration

of a cylinder?







YES / NO

Closed Hydrostatic Transmissions

1)
Do you know the basic building blocks of all closed hydrostatic

systems?








YES / NO

2)
Can you explain the term dynamic braking?



YES / NO

3)
Can you explain creep speed when linked to the machine hydraulic

motor/s?








YES / NO

4)
Can you explain the purpose of the:

a)
Charge
pump
YES
/
NO

b)
Hot
oil
shuttle
valve YES
/
NO

c) Hot oil shuttle valve back pressure RV




YES / NO

5)
Can you explain the term service brake and list the items that make up

such a system?







YES / NO

Accumulators

1)
Can you explain the general construction of a bladder type accumulator?
YES / NO

2)
Do you know the basic layout of an accumulator safety block?

YES / NO

3)
Can you explain the procedures to be followed to pre-charge an

accumulator?
YES
/
NO

4)
Do you know the type of Nitrogen that must be used to charge an

accumulator?
YES
/
NO

2004

Issue 1
BFPA Qualifications – Pre-programme Questionnaire – MH3 BFPA/Q13


Contamination Control

1)
Can you explain the meaning of the term 18/16/14 referring to

cleanliness
target
levels? YES
/
NO

2)
Do you know the various locations where filters are likely to be

installed on a machine and the benefits of each location?


YES / NO

3)
Can you explain the term Beta Ratio?




YES / NO

Installation/Commissioning/Fault Diagnosis

1)
If asked to install and commission a pressure compensated pump on

to a machine that requires fully setting up on site, would you be able

to plan and formulate the procedures to do this job?


YES / NO

2)
If confronted with a machine breakdown, are you familiar with the

F.C.R. approach to fault diagnosis?





YES / NO

Hydraulic Symbols

1)
Can you read and interpret circuit diagrams?


TICK
POOR
GOOD
1
2
3 4 5



2)
Would you be able to draw a circuit diagram using current symbols?
YES / NO

Hydraulic Reservoirs

1)
Do you know the basic requirements for a good reservoir design,
relating
to:

a) Size








YES / NO
b)
Internal
layout/configuration
of
flow
YES
/
NO

c)
Contamination
control
YES
/
NO

d)
Fluid
sampling
YES
/
NO

e)
Fluid
filling
arrangements
YES
/
NO

f)
Pipe
work
layout
YES
/
NO

Hydraulic Pipes and Hoses

1)
Can you list the points to be considered when selecting a hydraulic hose

for a particular job?







YES / NO

2)
Do you know the difference between a BSP adaptor and a JIC adaptor?
YES / NO

3)
Do you know the factors that affect the pressure drop in a pipe?

YES / NO

2004

Issue 1
BFPA Qualifications – Pre-programme Questionnaire – MH3 BFPA/Q13



FOR OFFICIAL USE


Reviewed
by:
Date:

Comments:








Checked
by
Director:
Date:

Comments:












National Fluid Power Centre
Carlton Road
Worksop
Nottinghamshire
S81 7HP

Tel: (01909)
504700
Fax: (01909)
484571
Website: www.nfpc.co.uk


2004

Issue 1