AURTTC003 WRITTEN ASSESSMENT ANAS IJAZ
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AURTTC103 Diagnose and repair cooling systems
Document Name:
Student Written Knowledge Assessment – AURTTC103
Created Date:
13
th
July 2020
Document No:
Trinity Institute (Australia) – AURTTC103
Version No:
3.0
Last Modified
Date:
14/5/22
© Trinity Institute (Australia) | RTO Code: 41310 | CRICOS Code: 03556F
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Student Assessment Agreement
Make sure you read through the assessments in this booklet before you fill out and sign the agreement
below. If there is anything that you are unsure of, consult your assessor prior to signing this agreement.
Have you read the assessment requirements for this unit?
Yes No
you understand the requirements of the assessments for this unit?
Yes No
Do you agree to the way in which you are being assessed?
Yes No
you have any specific needs that should be considered?
Yes
No
If so, explain these in the space below.
Do you understand your rights to re-assessment?
Yes No
Do you understand your right to appeal the decisions made in an assessment? Yes No
Student name
Anas ijaz
Student number
20220490
Student signature
Anasijaz
Date
06/02/2023
Qualification Code
and Title
AUR30616: Certificate III in Light Vehicle Mechanical Technology
Unit Code and Title
AURTTC003 Diagnose and repair cooling systems
Assessor name
Halim
Assessor signature
Date
AURTTC103 Diagnose and repair cooling systems
Document Name:
Student Written Knowledge Assessment – AURTTC103
Created Date:
13
th
July 2020
Document No:
Trinity Institute (Australia) – AURTTC103
Version No:
3.0
Last Modified
Date:
14/5/22
© Trinity Institute (Australia) | RTO Code: 41310 | CRICOS Code: 03556F
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Assessment Task 1 Cover Sheet
Student Declaration
To be filled out and submitted with assessment responses
I declare that this task is all my own work and I have not cheated or plagiarised the work or colluded with any other student(s).
I understand that if I If I am found to have plagiarised, cheated or colluded, action will be taken against me
according to the process explained to me.
I have correctly referenced all resources and reference texts throughout these assessment tasks.
Student name
Anas ijaz
Student ID number
20220147
Student signature
Anas ijaz
Date
06/02/2023
Assessor declaration
I hereby certify that this student has been assessed by me and that the assessment has been carried out according to the required assessment procedures.
Assessor name
Assessor signature
Date
Assessment outcome
S
NS
DNS
Resubmission
Y
N
Feedback
Student result response
My performance in this assessment task has been discussed and explained to me.
I would like to appeal this assessment decision.
Document Name:
Student Written Knowledge Assessment – AURTTC103
Created Date:
13
th
July 2020
Document No:
Trinity Institute (Australia) – AURTTC103
Version No:
3.0
Last Modified
Date:
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© Trinity Institute (Australia) | RTO Code: 41310 | CRICOS Code: 03556F
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AURTTC103 Diagnose and repair cooling systems
Student signature
Anas ijaz Date
05/02/2023
A copy of this page must be supplied to the office and kept in the student’s file with the evidence
Assessment 1 – Questioning – Written Assessment
Student Name
Anas ijaz
Student ID Number
20220490
Unit Start Date
09/01/2023
Unit End Date
19/02/2023
Assessment Due Date
09/02/2023
Date Submitted
06/02/2023
This cover sheet is to be completed by the student and assessor and used as a record to determine student competency in this assessment task
The assessment process and tasks were fully explained.
Yes
/ No
I am aware of which evidence will be collected and how.
Yes / No
I am aware of my right to appeal an assessment decision.
Yes / No
I am aware that I can locate The RTO Complaints and Appeals Policy and Procedure on their website at (Insert Website Link)
Yes / No
I have discussed any additional educational support or reasonable adjustments I require in order to undertake this assessment with the Student Support Services Officer and Trainer / Assessor, (if applicable). e.g. Student Handbook and Access and Equity Policy (Insert Website Link)
Yes / No
I have access to all required resources?
Yes / No
Cheating & Plagiarism Declaration
Student Declaration: In accordance with The RTO Plagiarism Policy, I hereby acknowledge by signing this declaration that I have not cheated or plagiarised any work regarding the assessment tasks undertaken in this unit of competency except where the work has been correctly acknowledged.
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AURTTC103 Diagnose and repair cooling systems
NOTE: Student must sign this prior to submitting their assessments to the assessor
Signature
Anas ijaz
Date
:
06
/ 02
/ 2023
Assessment Results
Satisfactory
or
Not Yet Satisfactory
(Please circle the assessment result for this task)
Feedback to Student - Please provide general feedback on the Student’s performance
Student Declaration: - I verify that the work completed is my own and that I was adequately informed of the assessment process prior to commencing this assessment task.
Assessor Declaration: - I verify that I have adequately
explained and negotiated the assessment tasks with
the student prior to commencing assessment.
Student Name: anas ijaz
Assessor’s Name: Halim
Student Signature: anasijaz
Date 06/02/2023
Assessor Signature
Date
Student Guide for Written Knowledge Assessment
Overview of Assessment
This is a written assessment task you will be assess on your knowledge of diagnosing
and repairing cooling systems.
The topics that will be covered in the assessment are:
1.
Prepare to diagnose and repair cooling systems
2.
Diagnose cooling systems
3.
Repair cooling systems
4.
Complete work processes
This assessment will ensure that the elements, performance criteria, performance
evidence and knowledge evidence required, and conditions are adhered to demonstrate
competency in this unit assessment task.
•
Read the assessment carefully before commencing.
•
Your Assessor will use the assessment criteria in this document and will provide feedback / comment.
•
You MUST
answer all the questions in the assessment tasks in your own words and own handwriting.
•
This is an “Open Book” assessment, and students can use the resources listed in
Document Name:
Student Written Knowledge Assessment – AURTTC103
Created Date:
13
th
July 2020
Document No:
Trinity Institute (Australia) – AURTTC103
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Last Modified
Date:
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Document Name:
Student Written Knowledge Assessment – AURTTC103
Created Date:
13
th
July 2020
Document No:
Trinity Institute (Australia) – AURTTC103
Version No:
3.0
Last Modified
Date:
14/5/22
© Trinity Institute (Australia) | RTO Code: 41310 | CRICOS Code: 03556F
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AURTTC103 Diagnose and repair cooling systems
the “Resources Required” section below.
Task/s to be assessed
To complete this written assessment, you will need to answer the 76
questions comprising of Multiple Choice, True and False, Fill-in the Gap and Short Answer questions.
Time allowed
On average, the Assessment should take 2 – 4 hours to complete.
Location
This theory assessment will be completed in a classroom under the supervision of a trainer/assessor.
Decision making
rules
To receive a ‘satisfactory’ outcome for this assessment students MUST
successfully answer all questions. If a student achieves less than 100%, they can reattempt the assessment after further study has taken place. Students who cannot achieve a minimum of 100% you will not have satisfactorily completed this assessment
Your assessor will be looking for the following in this assessment task: -
•
Work health and safety (WHS) and occupational health and safety (OHS) requirements relating to diagnosing and repairing cooling systems, including procedures for handling hot pressurised cooling systems
•
Environmental requirements, including procedures for trapping, storing and disposing of fluids released from cooling systems
•
Operating principles of cooling systems and associated components, including:
o
Effects of heat, including changes of temperature, colour, state and volume of substances
o
Heat transfer, including conduction, convection and radiation
o
Air cooled systems
o
Liquid cooled systems
•
Application, purpose and operation of the following components of cooling systems and components, including:
o
Engine coolant types and composition
o
Water pumps
o
Thermostats and bypass systems
o
Mechanical, hydraulic, pneumatic and electric cooling fan systems
o
Radiators and radiator caps
o
Heat exchangers
o
Expansion tanks
o
Hoses
o
Drive belts
o
Temperature sensors and gauges
•
Diagnostic testing procedures for cooling systems, including testing procedures for:
o
Effects of corrosion, cavitation and electrolysis
o
Transient voltage
o
Engine coolant
o
Cooling system pressure
o
Combustion leak
o
Cooling fan system
Document Name:
Student Written Knowledge Assessment – AURTTC103
Created Date:
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th
July 2020
Document No:
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Version No:
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Document Name:
Student Written Knowledge Assessment – AURTTC103
Created Date:
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th
July 2020
Document No:
Trinity Institute (Australia) – AURTTC103
Version No:
3.0
Last Modified
Date:
14/5/22
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AURTTC103 Diagnose and repair cooling systems
o
Thermostat
o
Infra-red thermal devices
o
Cooling system hose
o
Water pump
•
Repair procedures for cooling systems, including procedures for bleeding coolant systems
•
Post-repair testing procedures for cooling systems, including:
o
Fan system operation
o
Thermostat operation.
Assessment conditions
Assessors MUST
satisfy NVR/AQTF assessor requirements.
Competency is to be assessed in the workplace or a simulated environment that accurately reflects performance in a real workplace setting.
Assessment MUST
include direct observation of tasks.
Where assessment of competency includes third-party evidence, individuals MUST
provide
evidence that links them to the cooling systems that they have worked on, e.g. repair orders.
Assessors MUST
verify performance evidence through questioning on skills and knowledge
to ensure correct interpretation and application.
The following resources MUST
be made available:
•
Automotive repair workplace or simulated workplace
•
Workplace instructions
•
Manufacturer cooling system specifications
•
Two [2] different vehicles or machinery with cooling system faults
•
Diagnostic equipment for cooling systems
•
Tools, equipment and materials appropriate for repairing cooling systems.
Resources required
Learning Resources available to students include:
•
Automotive Technology (A System Approach) 6
th
Edition – Chapters 5, 6, 7, 8 & 14
•
Websites – http://what-when-how.com/automobile/air-cooling-system-automobile/
•
Trainer Handouts
Results/Re- assessment
•
The Assessor will grade the assessment and record the result on the front page of this document (S) – Satisfactory if all observable behaviours are correct and (NS) not satisfactory if any areas are left incorrect
•
Feedback will be provided on either result
•
Where a student receives a ‘NS – Not Satisfactory’ result, the assessor will discuss the area of the non-compliant observable behaviour and an opportunity given for re- assessment. This may be through direct observation or a different method of assessment e.g. verbal/oral questioning, problem solving exercise.
•
If the outcome is again not satisfactory the student result will be deemed (NYC) not
yet competent. Additional feedback will be given, and a time agreed upon for further
assessment after additional training and skills practice has taken place, this
Document Name:
Student Written Knowledge Assessment – AURTTC103
Created Date:
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th
July 2020
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information will be recorded, dated and signed in the re-assessment area on the
Document Name:
Student Written Knowledge Assessment – AURTTC103
Created Date:
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th
July 2020
Document No:
Trinity Institute (Australia) – AURTTC103
Version No:
3.0
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AURTTC103 Diagnose and repair cooling systems
last page of this document
•
Where all the assessment tasks have been graded (S) Satisfactory, the student will
be deemed C – Competent for the practical component and the result recorded
and signed in the area indicated on the last page of this document
Reasonable Adjustment
If the participant is unable to undertake the written assessment as designed, an interview (verbal questioning) may be used as an alternate approach.
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Document Name:
Student Written Knowledge Assessment – AURTTC103
Created Date:
13
th
July 2020
Document No:
Trinity Institute (Australia) – AURTTC103
Version No:
3.0
Last Modified
Date:
14/5/22
© Trinity Institute (Australia) | RTO Code: 41310 | CRICOS Code: 03556F
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AURTTC103 Diagnose and repair cooling systems
Assessment 1 – Questioning
Written Assessment
1.
Identify five (5) important items of personal safety when diagnosing and repairing cooling systems?
1
Safety
shoes
2
Wearing
clothing
3
Eye
protection
4
Skin
protection
5
Hearing
protection
2.
Describe the safety precaution that must be observed before removing the radiator cap or disconnecting any component of a hot cooling system?
•
Do
not
remove
the
radiator
cap
when
the
engine
is
hot
and
running.
•
Be
aware
of
the
rotating
components
before
topping
up
the
coolant.
•
Adhere
to
safe
work
practices
and
wear
protective
clothing
and
eyewear.
3.
Why should the radiator cap NEVER be removed when the engine is hot?
Never
open
the
radiator
cap
when
engine
is
hot
as
the
coolant
would
be
under
high
pressure
and
will
be
hot
and lead to serious burns. That is why, it should not be removed when the engine is hot.
4.
What are the potential danger of working near electric thematically operated cooling fans?
If
under-dimensioned,
performances
are
insufficient
causing
a
risk
of
overheating
or
air-
conditioning
malfunction.
If over-dimensioned, it may cause overconsumption causing a risk of fire
A
poorly-designed
fan
could
also
cause
noise
and
generate
vibrations
which
may
lead
to
failure
Document Name:
Student Written Knowledge Assessment – AURTTC103
Created Date:
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th
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AURTTC103 Diagnose and repair cooling systems
5.
When handling, trapping, storing and disposing of new or waste coolants, which document should you use to find this information?
Fuels
and
Lubricants
Handbook,
6.
How should waste coolant be stored and disposed?
Store:
Always
store
the
contaminated
fluids
under
cover
on
a
concreted
area
surrounded
by
a
bunded
area
of
at least 100mm height.
Diagnose
and
repair
cooling
systems:
Coolants,
Manual
transmission
fluids,
brake
and
clutch
fluids
should
be
kept in a separate container so that licensed contractor or recycler can collect easily for recycle.
Multiple Choice question. Select the correct answer.
7.
When changing the coolant in the cooling system, what should you use to catch the waste fluid?
A.
Drain
pan.
B.
Mop bucket.
C.
Storm water drain.
D.
Funnel.
8.
What is the difference between heat and temperature?
Heat
describes
the
transfer
of
thermal
energy
between
molecules
within
a
system
and
is
measured
in
Joules.
Heat measures how energy moves or flows.
Temperature
describes
the
average
kinetic
energy
of
molecules
within
a
material
or
system
and
is
measured
in Celsius (°C), Kelvin(K), Fahrenheit (°F), or Rankine (R)
9.
What are the four (4) possible effects when heat is applied to a substance?
1
Changes
state
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AURTTC103 Diagnose and repair cooling systems
2
Brings
about
chemical
action
3
Kinetic
energy
of
the
particles increases
4
Raises
the temperature.
Document Name:
Student Written Knowledge Assessment – AURTTC103
Created Date:
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th
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AURTTC103 Diagnose and repair cooling systems
Document Name:
Student Written Knowledge Assessment – AURTTC103
Created Date:
13
th
July 2020
Document No:
Trinity Institute (Australia) – AURTTC103
Version No:
3.0
Last Modified
Date:
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© Trinity Institute (Australia) | RTO Code: 41310 | CRICOS Code: 03556F
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10.
What is the unusual effect that occurs with water when its temperature is reduced?
A
decrease
in
temperature
caused
the
water
molecules
to
lose
energy
and
slowdown,
which
results
in
water molecules that are closer together and a decrease in water volume.
11.
Heat can be transferred in three (3) different ways. What are these?
1.
Conduction,
,
2.
convention
3.
radiation
12.
What is meant by radiation?
Radiation is the heat transfer through empty space by thermal radiation or when they strike colder objects
Fill in the Gaps
13.
Complete the following statement about air cooled systems using the following words. http://what-when-
how.com/automobile/air-cooling-system-automobile/
Words: Directly, Engines, Fins, Hoses, Transferred
An air-cooled engine
is simpler to design then the water-cooled engine because the heat is
tr
ansferred
from the cylinder and head directed
to the air. There is no need for water jackets, hoses
, water pump, radiator, etc. But, the engine design uses many fins
on the cylinder and head for effective heat transfer to the surrounding air
14.
How is heat removed from the engine?
There
are
two
types
of
coolants
used
to
remove
the
heat
from
the
engine
block
and
head:
air,
and
water.
With
air
as a coolant, the heat is removed through the use of fins attached to the cylinder wall. With water as a coolant, the heat is removed through the use of fluid filled internal cooling passages
AURTTC103 Diagnose and repair cooling systems
Document Name:
Student Written Knowledge Assessment – AURTTC103
Created Date:
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th
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Document No:
Trinity Institute (Australia) – AURTTC103
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3.0
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15.
Why is it necessary to remove heat from the engine?
If
this
heat
is
not
removed,
engine
internal
temperatures
would
soon
reach
a
point
of
component
damage
and engine failure. That is why, it is necessary to remove heat from the engine
Multiple Choice question. Select the correct answer.
16.
Ethylene glycol antifreeze is .
A.
The most commonly used antifreeze.
B.
Green in colour.
C.
Poisonous.
D.
All
answers
are
correct.
Multiple Choice question. Select the correct answer.
17.
The minimum concentration of antifreeze is .
A.
20% antifreeze, 80% water.
B.
33% antifreeze, 66% water.
C.
44% antifreeze, 56% water.
D.
50%
antifreeze,
50%
water.
18.
List three (3) different types of antifreeze.
1
Ethylene
glycol
Ethylene
glycol
2
Organic
acid
technology
(OAT)
3
Hybrid
OAT
Multiple Choice question. Select the correct answer.
19.
In most automotive applications, the water pump is driven by the .
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AURTTC103 Diagnose and repair cooling systems
Document Name:
Student Written Knowledge Assessment – AURTTC103
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th
July 2020
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A.
Flywheel.
B.
Camshaft.
AURTTC103 Diagnose and repair cooling systems
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th
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C.
Crankshaft.
D.
Impeller.
Multiple Choice question. Select the correct answer.
20.
Water pumps are type pumps.
A.
Positive displacement.
B.
Negative displacement.
C.
Centrifugal.
D.
Reciprocating
True or False question
21.
The heart of the cooling system is the water pump. Its job is to move the coolant through the system.
☒
True
or
☐ False
22.
What is the function of the thermostat?
The
thermostat
is
basically
a
valve
between
the
engine
and
the
radiator.
It
is
connected
to
the
cylinder
head
and
enclosed
by
a
small
housing
with
a
coolant
outlet
and
a
thermo
switch.
Multiple Choice question. Select the correct answer.
23.
During engine warm-up, when the thermostat is closed, .
A.
Coolant flows through the radiator.
B.
Coolant
flows
through
the
bypass
passage.
C.
Both “coolant flows through the radiator” and “coolant flows through the bypass passage”.
D.
Neither “coolant flows through the radiator” nor “coolant flows through the bypass passage”.
Fill in the Gaps
24.
Complete the following statement about bypass thermostats using the following words.
Words: Bypass, Coolant, Engine, Open, Prevents, Radiator, Secondary, Thermostats, Valve
Bypass thermostats increase cooling system efficiency. They do this by ensuring that all
coolant
passes through the radiator when the engine
is at correct operating
AURTTC103 Diagnose and repair cooling systems
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Student Written Knowledge Assessment – AURTTC103
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th
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temperature.
This thermostat has two valves: a primary and a secondary . When the engine is cold, the primary valve is closed and this prevent
fluid from reaching the radiator. The secondary valve is
open
, and this allows the coolant to bypass the radiator
and go back into the engine.
As the engine temperature rises, the primary valve
opens and the secondary valve closes. This
blocks off the bypass
and all the coolant is then directed through the radiator.
True or False question
25.
Electric cooling fans may be controlled by the engine control module (ECM)?
☒
True
or
☐ False
26.
What is the function of a fan clutch?
the fan clutch will disengage the engine’s radiator cooling fan to a certain degree (which is mechanically compelled).
This
is
typically
found
at
the
front
of
the
water
pump
and
it
is
driven
by
a
belt
and
pulley
that
is attached to the engine’s crankshaft
Fill in the Gaps
27.
Complete the following statement about cooling fans using the following words.
Words: Air, Engine, Cooling, Motor, Removed, Speeds, Steering
The efficiency of the cooling
system depends on the amount of heat that can be
removed
from the system and transferred to the air. At highway speed
, the ram air through the radiator should be sufficient to maintain proper cooling. At low speeds and idle, the system needs
additional air
. This air is delivered by a fan. The fan may be driven by the engine
, via
a belt, driven by an electric motor
, or hydraulically through the power-
steering
system.
28.
Briefly, how does a hydraulic cooling fan operate?
Hydraulic
cooling
fan
are
driven
by
a
hydraulic
unit.
When
the
temperature
of
the
system
is
high,
the
viscous
fluid
inside
the
fan
expands
and
allows
a
tight
bond
between
fan
and
coupling
which
makes
the
fan
to
rotate
according to the engine speed
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th
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29. Explain how a belt-driven cooling fan operates?
They are driven by belt drive with pulleys connected to crankshaft. The fan pulley rotates when the crankshaft is
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AURTTC103 Diagnose and repair cooling systems
rotated,
and
air
is
drawn
in
by
the
cooling
fan
blades.
The
fan
runs
constantly
Multiple Choice question. Select the correct answer.
30.
An engine coolant temperature switch or sensor is used to directly or indirectly energise the.
A.
Blower motor.
B.
Radiator
fan
motor
relay.
C.
Compressor clutch.
D.
Dashboard warning light.
31.
Many electric cooling fans are ultimately controlled by what device?
The
Power
train
control
module
True or False question
32.
On some medium/heavy duty trucks, the ECM-controlled variable speed (VS) clutches can be either electromagnetically or pneumatically controlled and can be considered the more advanced of the currently available fan drive technologies.
☒ True
or
☐ False Multiple Choice question. Select the correct answer.
33.
In a crossflow radiator, the coolant flow is from.
A.
Top
to
bottom.
B.
One side to the other side.
C.
Diagonally.
D.
Bottom to top.
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Fill in the Gaps
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34.
Complete the following statement about radiators using the following words.
Words: Aluminum, Cap, Coolant’s, Exchanger, Hot, Petcocks, Radiator, Top
The radiator is a heat exchanger , transferring heat from the engine to the air passing through it. The radiator
is a series of tubes and fins (collectively called the core) that expose the
coolants
heat to as much surface area as possible. Attached to the sides or top
and bottom of the core are plastic or aluminum tanks. One tank holds hot
coolant and the other holds
the cooled coolant. Cores are normally comprised of flattened aluminum tubes surrounded by thin aluminum_ fins. The fins conduct the heat from the tubes to the air flowing through the radiator. Most radiators have drain petcocks
or plugs near the bottom. Coolant is added at the radiator
cap
or the recovery tank
35.
Name the eight [8] parts of a radiator below?
1
Outlet
tank
(plastic)
2
Bending
tangs
3
Inlet
tank
(plastic)
4
Draincock
5
O-ring
gasket
6
Radiator
core
(aluminum)
7
O-
ring
gasket
8
Transmission
oil
cooler
36.
What is the function of the radiator cap?
It
keeps
the
cooling
system
sealed
from
outside
contaminants.
True or False question
37.
The cooling system pressure is regulated by the radiator cap.
☒
True
or
☐ False
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True or False question
38.
The transmission cooler is a heat exchanger sealed in the radiator core.
☒
True
or
☐ False
True or False question
39.
Most cooling systems use an expansion or recovery tank.
☒
True
or
☐ False
Fill in the Gaps
40.
Complete the following statement about expansion tanks using the following words.
Words: Coolant, Cooling, Expands, Expansion, Pressure, Shrink
All late-model _
cooling systems have an expansion or recovery tank. These systems are called
closed-cooling systems. They are designed to catch and hold any coolant
that passes through the pressure cap. As the engine warms up, the coolant expand
. This eventually causes the pressure cap to release and allows some coolant to move into the expansion
tank. When the engine is shut down, the coolant begins to shrink
. Eventually, the vacuum spring inside the
pressure
cap opens and the coolant in the expansion tank is drawn back into the cooling system.
True or False question
41.
Coolant flows from the engine to the radiator and from the radiator to the engine through radiator hoses.
☒
True
or
☐ False
42.
A hose is typically made up of three (3) parts. What are they?
1
An
inner
rubber
tube
2
Some
reinforcement
mate
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3
Outer rubber cover
48. Explain how corrosion occurs in the cooling system?
Corrosion happens when a material reacts chemically with its surroundings. Water and oxygen normally combine
True or False question
43.
Cooling system hoses must be able to endure heavy vibrations and be resistant to oil, heat, abrasion, weathering and pressure.
☒
True
or
☐ False
44.
What are drive belts (belt drives) used for in the cooling system?
Drive
belts
provide
power
in
the
cooling
system
45.
What is the function of the temperature sensor in the cooling system? They are gauges and sensors to indicate warning in the cooling system.
Temperature
gauge
to
indicate
any
high
temperatures
and
a
thermos
sensor
in
the
system
operates
the
gauge
and
the
warning
light
in
instrument
panel
True or False question
46.
The coolant temperature indicator alerts the driver of an overheating condition. These indicators are a temperature gauge and/or a warning light?
☒
True
or
☐ False
47.
A voltmeter is used to check the cooling system.
It
is
used
to
measure
the
stray
voltage
in
the
cooling
system
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AURTTC103 Diagnose and repair cooling systems
with
a
metal
to
form
an
oxide
of
the
metal
and
weakens
the
metal
and
leads
to
the
failure
of
component.
Coolant
condition
needs
to
be
checked
to
ensure
the
metal
loss
due
to
corrosion
49.
What is cavitation?
Cavitation
is
the
formation
of
small
vapour
bubbles
against
a
metal
surface
causing
erosion
of
the
metal
particles.
It usually occurs around the water pump impeller. Coolant pressure needs to be monitored regularly to avoid cavitation
Fill in the Gaps
50.
Complete the following statement about diagnosing electrolysis using the following words.
Words: Cranked, DMM, Electrolysis, Meter, Negative, Positive, Problem, Running, Voltage
To check for the conditions prone to electrolysis , use a voltmeter that is capable of measuring AC and DC voltage. Set the meter
so it can read in tenths of a volt DC. Attach the
positive
meter lead to a good ground. Place the negative
lead into the coolant. Look
at the meter while the engine is cranked
with the starter and record the readings. Take another reading with the engine running
and all accessories turned on. Record that reading.
voltage
readings of 0 to 0.3 volt are normal for a cast-iron engine; normal readings for a bimetal or aluminium engine are half that amount. Repeat the test with the DMM
in the AC voltage mode.
There will be AC voltage if the problem
is static electricity. Any readings above normal indicate a problem
True or False question
51.
A hydrometer is used to measure the concentration of antifreeze in coolant.
☐
True
or
☒
False
True or False question
52.
A refractomer is used to measure the concentration of antifreeze in coolant
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☒
True
or
☐ False
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53.
How and why are test strips used to evaluate coolant condition?
Coolant
Test
Strips
are
disposable
test
strips
for
measuring
the
concentration
level
and
condition
of
AntiFreeze/Anti- Boil coolants used in all types of combustion engines. They effectively test the coolant's concentration as well as the pH level and alkalinity to determine when service of the coolant is necessary
True or False question
54.
A cooling system pressure tester is used to test for leaks in the radiator, hoses, water pump, thermostat, and engine assembly.
☒
True
or
☐ False
Multiple Choice question. Select the correct answer.
55.
When testing a radiator cap, with the rated pressure applied, the cap should hold that pressure for at least
.
A.
30 seconds.
B.
1
minute.
C.
5 minutes.
D.
20 minutes.
56.
What are the requirements when a pressure cap is tested using a cooling system pressure tester?
a)
Remove
the
radiator
cap
b)
Top
up
with
coolant
to
the
rim
of
the
filler
neck
c)
Attach
the
pressure
testing
equipment
to
the
radiator
filler
neck.
Pump
up
the
pressure
tester
to
the manufacturer’s recommended pressure limit.
d)
Observe
the
pressure
gauge
for
pressure
loss.
If
the
pressure
gauge
drops,
there
is
a
leakage
in
the
cooling system
e)
Carry
out
visual
inspection
of
the
cooling
system
to
locate
the
leak.
Repair
the
leak
source.
f)
Repeat
the
pressure
test
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Multiple Choice question. Select the correct answer.
57.
When using a combustion gas leak check: the colour of the fluid turns from blue to if there are
combustion gases in the coolant.
A.
Red.
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B.
Blue.
C.
Yellow.
D.
Green.
58.
Describe the process to check for combustion gas leakage into the cooling system.
A
general
test
for
gas
leakage
can
be
made
by
running
the
engine
with
the
radiator
cap
removed.
The
coolant
in
the radiator tank is checked for bubbles or any rise in level that may not be due to normal circulation by the water
pump.
Another method is to check hydrocarbon (HC) in the coolant.
A
leaking head gasket will allow small traces of unburnt
fuel
(HC)
into
the
cooling
system.
A
combustion
leak
detector
being
used
on
the
radiator.
The
test
fluid
in
the detector will change the colour when hydrocarbons are detected
Fill in the Gaps
59.
Complete the following statement about diagnosing electric cooling fan using the following words.
Words: Blades, Cooling, Motor, Not, Problem, Reaches, Sequence
The action of the electric cooling fan should be observed. However, before doing so, check the mounting of the fan assembly and the condition of the fan _
blades
. The fan should be energised when the A/C is turned on and when the coolant reaches
a specified temperature. If the fan does
not turn on when it should, check the motor
. Do this by connecting the motor directly to the battery. If the motor runs, the problem
is in the motor’s control circuit. Diagnosis of this problem should follow the prescribed sequence given by the manufacturer. If the jumped motor does
not
run, the problem is the fan motor.
True or False question
60.
The operation of a thermostat can be observed with an infrared thermometer.
☒
True
or
☐ False
61.
The thermostat is often the cause of overheating or poor heater performance. What other problems can a faulty thermostat cause?
They
can
also
cause
an
increase
in
fuel
consumption
and
poor
engine
performance
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True or False question
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62.
If the thermostat is stuck closed, because it failed or because there is a steam pocket below the thermostat, coolant will not flow between the engine and the radiator; the engine will, therefore, quickly overheat?
☒
True
or
☐ False
63.
You should carefully check all cooling hoses for what type of faults?
Check
each
hose
for
signs
of
cracking,
splitting,
bulging
and
chaffing.
If
any
of
these
conditions
exist
replace
the hose
64.
What is Electrochemical Degradation (ECD), and what effect does it have on rubber hoses? Electrochemical degradation (ECD) is the breakdown of material in thehose wall or tube due to electrical reactions between the fluid (coolant) and the metal parts of the engine. The phenomenon is known as electrochemical degradation,
or
ECD.
It
occurs
because
the
hose,
liquid
coolant
and
the
engine/
radiator
fittings
form
a
galvanic
cell
or
“battery”.
This
chemical
reaction
causes
micro-cracks
in
the
hose
tube,
allowing
the
coolant
to
attack
and
weaken
the
hose reinforcement.
65.
Identify five (5) causes of water pump failure.
1
Improper
Use
of
Seals/Gaskets
or
Sealant
2
Bearing
Overload
3
Bad/wrong
coolant
4
Worn/improperly
installed
belt
5
Dry
running
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Multiple Choice question. Select the correct answer.
66.
Two technicians are discussing a vehicle with an overheating problem. There are no leaks, internal or external. The belts are in good condition, and the radiator has been removed and flow tested. Everything appears to be in good condition. A new thermostat was installed, but it did not cure the problem. What could be the fault?
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A.
The impeller could be slipping on the water pump shaft.
B.
The impeller blades could be corroded.
C.
Both
“the
impeller
could
be
slipping
on
the
water
pump
shaft”
and
“the
impeller
blades
could
be
corroded”.
D.
Neither “the impeller could be slipping on the water pump shaft” and “the impeller blades could be corroded”.
Multiple Choice question. Select the correct answer.
67.
If the engine overheats during long periods of idling but runs normally at highway speeds, the problem is most likely
A.
Defective thermostat.
B.
Defective water pump.
C.
Defective
cooling
fan.
D.
Defective radiator.
68.
Two (2) problems with the water pump are normally?
1
Stopped
Pump
2
Reduced
Water
True or False question
69.
When replacing a thermostat, the replacement should always have the same temperature rating as the original.
☒
True
or
☐ False
70.
Complete the following statement about replacing the thermostat using the following words.
Words:
Markings on the thermostat normally indicate
which end should face toward the
radiator
. Regardless of the markings, the sensored end must always be installed toward the
engine
. When replacing the thermostat, also replace the gasket
that seals the thermostat in place and is positioned between the thermostat housing and the block. Make sure the mating
_
surfaces on the housing and block are clean and free of old gasket material
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True or False question
71.
When replacing the water pump, always follow the procedure given by the manufacturer.
☒
True
or
☐ False
72.
Describe the procedure to bleed the cooling system using “air bleeds”.
1.
A
mixture
of
antifreeze
and
water
in
1:1
ratio
must
be
filled
in
the
system.
2.
Before
turning
ON
the
engine,
radiator
cap
must
be
removed.
3.
The
engine
is
allowed
to
run
for
some
time
until
it
reaches
the
operating
temperature.
4.
The
coolant
level
will
drop
as
the
air
bubbles
get
cycled
out
from
the
radiator.
5.
The
temperature
drop
must
be
observed
with
the
gauge
and
ensure
it
is
close
to
normal.
If
the
temperature does not decrease, the bleeding process must be repeated
73.
What is a vacuum fill system, and how does it refill the cooling system?
Vacuum
fill
system:
A
vacuum
filler
is
a
machine
used
for
filling
pasty
products.
The
pasty
products
are
moved
with
the aid of a vane cell feed system under a vacuum.
1.
Connect
the
coolant
hose
to
the
vacuum
purge
and
refill
tool
and
submerge
in
coolant.
2.
Assure
that
valve
No.
3
is
in
the
closed
position
and
that
there
is
coolant
in
the
coolant
hose.
3.
Turn
valve
No.
6
to
the
open
position
to
allow
the
coolant
to
refill
the
cooling
system.
4.
The
refill
is
complete
when
the
gauge
reads
74.
Consider the various post repair checks that you would make during a road test on the cooling system?
1.
Check
the
level
of
coolant
2.
Check
the
tightness
of
radiator
clamps
3.
Check
the
radiator
mounting
bolts
–
4.
Check
the
electrical
connections
5.
Check
for
leaks
Multiple Choice question. Select the correct answer.
75.
Which source of information will give you the most detail about diagnosing and repairing cooling systems on the vehicle you are working on?
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A.
Workshop
manual.
B.
Owner’s manual.
C.
Google.
D.
Textbooks.
76.
Why is it very important that the Job Card is completed correctly?
The
Job
Card
becomes
a
legal
document.
Service
records
are
kept
by
the
workshop
to
maintain
the vehicle’s service history and for legal purposes.
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Chapter 12 - Lecture Notes.pptx: (MAE 272-01) (SP25) DY...
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Hartley Electronics, Inc., in Nashville, producesshort runs of custom airwave scanners for the defense industry.The owner, Janet Hartley, has asked you to reduce inventory byintroducing a kanban system. After several hours of analysis, youdevelop the following data for scanner connectors used in onework cell. How many kanbans do you need for this connector?Daily demand 1,000 connectorsLead time 2 daysSafety stock 12 dayKanban size 500 connectors
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The Weather Monitor. Your South American expedition splits into two groups: one that stays at home base, and yours that goes off to
set up a sensor that will monitor precipitation, temperature, and sunlight through the upcoming winter. The sensor must link up to a
central communications system at base camp that simultaneously uploads the data from numerous sensors to a satellite. In order to
set up and calibrate the sensor, you will have to communicate with base camp to give them specific location information.
Unfortunately, the group's communication and navigation equipment has dwindled to walkie-talkies and a compass due to a river-raft
mishap, which means your group must not exceed the range of the walkie-talkies (3.0 miles). However, you do have a laser rangefinder
to help you measure distances as you navigate with the compass. After a few hours of hiking, you find the perfect plateau on which to
mount the sensor. You have carefully mapped your path from base camp around lakes and…
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You are assigned as the head of the engineering team to work on selecting the right-sized blower that will go on your new line of hybrid vehicles.The fan circulates the warm air on the inside of the windshield to stop condensation of water vapor and allow for maximum visibility during wintertime (see images). You have been provided with some info. and are asked to pick from the bottom table, the right model number(s) that will satisfy the requirement. Your car is equipped with a fan blower setting that allow you to choose between speeds 0, 1,2 and 3. Variation of the convection heat transfer coefficient is dependent upon multiple factors, including the size and the blower configuration.You can only use the following parameters:
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Handwritten solution required.
Strictly don't use chatgpt.
If you use chatgpt ,I will report the answer for sure.
Mechanical engineering dynamics.
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I want to answer all the questions by handwriting.
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reply fast
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I can't find the symbols for the blank ones
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K
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Chapter 12 - Lecture Notes.pptx: (MAE 272-01) (SP25) DY...
P Pearson MyLab and Mastering
Mastering Engineering
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The free body diagram must be drawn , its mandatory.
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I Blackboard @ Texas Tech Uni x
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C Suppose That H = 3.8 M . (Fi x
X Mathway | Calculus Problem x
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Part A
Find the magnitude of the projected component of the force along the pipe AO.
(Figure 1)
Express your answer to three significant figures and include the appropriate units.
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Figure
4 m
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4 m
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AHMAD, ASHNA
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A student develops a model of an electric motor using two pins, a wire coil,
coil continues to spin with a certain speed.
wire coil
pins
magnet
tape
battery
How can the student increase the speed of the electric motor?
O by using wider pins
O by using thinner pins
O by using less wire in the clil
O by using more wire in the coil
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est 2 (copy) (page 4 of 9)
A wiseup.wsu.acza/mod/quiz/attempt.php7attempt=610918cmid 148960&page=3
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ashboard / My courses / FLM15B2_KF_WS6222 2021 / Tests / Test 2 (copy)
uestion 4
Quz navigation
Gate AB in Figure below is 1.0 m long and 0.9 wide. Calculate force F on the gate and position X of its centre of
Not yet
answered
pressure.
Marked out of
Finish attempt
10,000
Rag question
3m
Oil,
s.g.=Q81
7m
1.0m
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50
Answer
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Don't copy paste someone else answer if I get to know I'll report and downvote too do on your own and only handwritten with proper steps not that handwritten only
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University of Babylon
Collage of Engineering\Al-Musayab
Department of Automobile
Engineering
Under Grad/Third stage
Notes:
1-Attempt Four Questions.
2- Q4 Must be Answered
3-Assume any missing data.
4 تسلم الأسئلة بعد الامتحان مع الدفتر
Subject: Mechanical
Element Design I
Date: 2022\01\25
2022-2023
Time: Three Hours
Course 1
Attempt 1
Q1/ Design a thin cylindrical pressure tank (pressure vessel) with hemispherical ends to the
automotive industry, shown in figure I below. Design for an infinite life by finding the
appropriate thickness of the vessel to carry a sinusoidal pressure varied from {(-0.1) to (6) Mpa}.
The vessel is made from Stainless Steel Alloy-Type 316 sheet annealed. The operating
temperature is 80 C° and the dimeter of the cylinder is 36 cm. use a safety factor of 1.8.
Fig. 1
(15 Marks)
Q2/ Answer the following:
1- Derive the design equation for the direct evaluation of the diameter of a shaft to a desired
fatigue safety factor, if the shaft subjected to both fluctuated…
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Chapter 50 multiple Choice #5 what is the cause of an extremely hard brake pedal
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- mylabmastering.pearson.com Chapter 12 - Lecture Notes.pptx: (MAE 272-01) (SP25) DY... P Pearson MyLab and Mastering Scoresarrow_forwardHartley Electronics, Inc., in Nashville, producesshort runs of custom airwave scanners for the defense industry.The owner, Janet Hartley, has asked you to reduce inventory byintroducing a kanban system. After several hours of analysis, youdevelop the following data for scanner connectors used in onework cell. How many kanbans do you need for this connector?Daily demand 1,000 connectorsLead time 2 daysSafety stock 12 dayKanban size 500 connectorsarrow_forwardThe Weather Monitor. Your South American expedition splits into two groups: one that stays at home base, and yours that goes off to set up a sensor that will monitor precipitation, temperature, and sunlight through the upcoming winter. The sensor must link up to a central communications system at base camp that simultaneously uploads the data from numerous sensors to a satellite. In order to set up and calibrate the sensor, you will have to communicate with base camp to give them specific location information. Unfortunately, the group's communication and navigation equipment has dwindled to walkie-talkies and a compass due to a river-raft mishap, which means your group must not exceed the range of the walkie-talkies (3.0 miles). However, you do have a laser rangefinder to help you measure distances as you navigate with the compass. After a few hours of hiking, you find the perfect plateau on which to mount the sensor. You have carefully mapped your path from base camp around lakes and…arrow_forward
- I need help solving this problem.arrow_forwardYou are assigned as the head of the engineering team to work on selecting the right-sized blower that will go on your new line of hybrid vehicles.The fan circulates the warm air on the inside of the windshield to stop condensation of water vapor and allow for maximum visibility during wintertime (see images). You have been provided with some info. and are asked to pick from the bottom table, the right model number(s) that will satisfy the requirement. Your car is equipped with a fan blower setting that allow you to choose between speeds 0, 1,2 and 3. Variation of the convection heat transfer coefficient is dependent upon multiple factors, including the size and the blower configuration.You can only use the following parameters:arrow_forwardHandwritten solution required. Strictly don't use chatgpt. If you use chatgpt ,I will report the answer for sure. Mechanical engineering dynamics.arrow_forward
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Recommended textbooks for you
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning
Principles of Heat Transfer (Activate Learning wi...
Mechanical Engineering
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Cengage Learning