for students and educators

1. 7
TVL –ICT - CSS
Quarter 1 – Module 7
Preparing and Interpreting
Technical Drawing
7
11 SENIOR HIGH SCHOOL

2. TVL – Grade 11
Alternative Delivery Mode
Quarter 1 – Module 7: Preparing and Interpreting Technical Drawing (PITD) First
Edition, 2020
Republic Act 8293, section 176 states that: No copyright shall subsist in any work
of the Government of the Philippines. However, prior approval of the government
agency or office wherein the work is created shall be necessary for exploitation of such
work for profit. Such agency or office may, among other things, impose as a condition
the payment of royalties.
Borrowed materials (i.e., songs, stories, poems, pictures, photos, brand names,
trademarks, etc.) included in this module are owned by their respective copyright
holders. Every effort has been exerted to locate and seek permission to use these
materials from their respective copyright owners. The publisher and authors do not
represent nor claim ownership over them.
Published by the Department of Education
Secretary: Leonor Magtolis Briones
Undersecretary: Diosdado M. San Antonio
Development Team of the Module
Writer: Catherine B. Fuentes
Editor: Reynald R. Manzano
Reviewer: Ruth Marie B. Eltanal
Typesetter:
Layout Artist:
Management Team: Senen Priscillo P. Paulin, CESO V Rosela R. Abiera
Marcelo K. Palispis, Ed.D. Maricel S. Rasid
Joelyza M. Arcilla, Ed. D.
Nilita L. Ragay, Ed.D.
Antonio B. Baguio Jr., Ed. D.
Elmar L. Cabrera
Printed in the Philippines by ________________________
Department of Education –Region VII Schools Division of Negros Oriental
Office Address: Kagawasan, Ave., Daro, Dumaguete City, Negros Oriental
Tele #: (035) 225 2376 / 541 1117
E-mail Address: negros.oriental@deped.gov.ph

3. 11
TVL
Quarter 1 Module 7:
Preparing and Interpreting
Technical Drawing (PITD)

4. 1
What I Need to Know
This module was designed and written with you in mind. It is here to help you
master the Preparing and Interpreting technical Drawing (PITD). The scope of this
module permits it to be used in many different learning situations. The language
used recognizes the diverse vocabulary level of students. The lessons are arranged to
follow the standard sequence of the course. But the order in which you read them
can be changed to correspond with the textbook you are now using.
The module is divided into two lessons, namely:
• Lesson 1 – Identify and interpret technical drawings
• Lesson 2 – Prepare and store technical drawings and equipment
/ instruments
After going through this module, you are expected to:
1. Identify the basic symbols used in technical drawing.
2. Prepare and interpret technical drawing in accordance with the job
requirement.
3. Express and communicate ideas through technical drawing.
4. Identify correctly some basic symbols for electrical / electronic schematics
drawings.
5. Prepare simple electronic schematic diagram.
6. Attention and be mindful to symbols and details while working on
schematic drawing.
7. Identify ways of proper maintenance of equipment / instruments. 8. Prepare
a record of inventory in accordance with company or job requirements.
8. Conduct a regular maintenance on equipment/instruments properly
according to company procedure or job requirements to avoid issues.

5. 2
What I Know
Direction: Matching Type: Match Column A with Column B. Write only the letter
of the correct answer in your TLE activity notebook.
COLUMN A COLUMN B
_____ 1. It is represented by a rectangle. It refers
to an action in a business process.
_____ 2. It is represented by a diamond. A process
that can answer a decision of "yes" or
"no" requires a decision box.
_____ 3. It is represented by a small circle or a
connector box and is labelled using
letters.
_____ 4. Drawn in one direction, preferably from
top to bottom to keep a flowchart clear.
_____ 5. A process is represented by a rectangle
with double lines on each side.
_____ 6. It is represented by a small rectangle with
curved corner
_____ 7. A diagram that displays the sequence of work
steps
_____ 8. Shows the actual process flow and identifies
the people or group involve at each step.
_____ 9. A person skilled in mechanical or
industrial techniques or in a particular
technical field.
_____ 10. A diagram that uses graphic symbols to
depict the nature and flow of the steps
in a process.
a. Decision
b. Process
c. Arrow line
d. Connector
e. Sub-process
f. Flowchart
g. Terminator
h. Drawing
i. Deployment
flowchart
j. Technician
k. Linear flowchart

6. 3
Lesson
1
Identify & Interpret
Technical Drawings
What’s In
1. What is a flowchart?
2. What are the elements of a flowchart?
Flowchart
A flowchart is a diagram that uses graphic symbols to depict the nature and
flow of the steps in a process. Another name for this tool is "flow diagram." A
flowchart is commonly used by systems analysts to visualize, to design, and to
troubleshoot or improves an existing system.
What Are the Elements of a Flowchart?
1. Terminator - represented by a small rectangle with curved corners. It
appears at the start and at the end of a flowchart.
2. Process - represented by a rectangle. It refers to an action in a business
process. It must be described clearly and concisely. A process can be described
using a single verb-noun phrase (e.g. Order Office Supplies).
3. Sub-process - represented by a rectangle with double lines on each side.
A sub process is a major process that could be broken up into simpler processes
developed into another flowchart.
4. Decision - represented by a diamond and can answer a decision of "yes"
or "no".
5. Connector - represented by a small circle or a connector box and is
labelled using letters to ensure that the processes are connected logically and
correctly on several pages.
6. Arrow Lines - drawn in one direction, preferably from top to bottom, keep
a flowchart clear.

7. 4
Basic Flowchart Symbols
The symbols that are commonly used in flowcharts have specific meanings
and are connected by arrows indicating the flow from one step to another:
1. Oval. Ovals indicate both the starting point
and the ending point of the process steps.
2. Box. A box represents an individual step or
activity in the process.
3. Diamond. A diamond shows a decision point,
such as yes/no or go/no-go. Each path emerging
from the diamond must be labelled with one of
the possible answers.
4. Circle. A circle indicates that a particular step
is connected to another page or part of the
Flowchart. A letter placed in the circle clarifies
the continuation.
5. Triangle. A triangle shows where an in-process
measurement occurs.
Fig 1. Example of a Simple Flowchart Sample of a work plan flowchart:
Cleaning the Computer laboratory

8. 5
Interpret Technical Drawing
How do you interpret flowcharts?
A Flowchart will help you understand your process and uncover ways to improve
it only if you use it to analyze what is happening. Interpreting your Flowchart will
help you to :
• Determine who is involved in the process. Form theories about root causes
• Identify ways to streamline the process.
• Determine how to implement changes to the process.
• Locate cost-added-only steps.
• Provide training on how the process works or should work.
Below is a sequence of steps that will help you through an orderly analysis of
your flowchart.
Step 1 - Examine each process step for the conditions that indicate a need to
improve the process.
Step 2 - Examine each decision symbol. You may want to collect data on how often
there is a "yes" or "no" answer at decision points marked by a diamond shaped
symbol. If most decisions go one way rather than the other, you may be able to
remove this decision point.
Step 3 - Examine each activity symbol if the step help build a key quality
characteristic into the process and if not, consider eliminating it.
Types of flowchart
1. Linear Flowchart is a diagram that displays the sequence of work steps that make
up a process which can help identify redundant or unnecessary steps within a
process.
2. Deployment Flowchart shows the actual process flow and identifies the people
or groups involved at each step.
How do we construct a linear flowchart?
The following are the seven steps for developing a linear flowchart
1. Define the process to be flowcharted, and the purpose for flowcharting it.
2. Assemble the right people to develop the flowchart—those operators,
technicians or office workers who are actually involved in the process.
3. Establish process boundaries—the starting and ending points. Identify the
activities or sub processes that are included in the process.
4. List the steps, activities, and decisions to be charted. If your team is not
sure about a step, mark it to be investigated later.
5. Put the steps in chronological sequence. Sometimes it's easier to start with
the last step and work back to the first step.
6. Assign flowchart symbols such as boxes, diamonds, and triangles.
7. Review and title the Flowchart.

9. 6
What’s More
A. Directions: Draw the symbol of the following elements. Write your answer
in your TLE activity notebook.
1. Indicates that a particular step is connected to another page or part of the
flowchart.
2. Shows a decision point, such as yes/no or go/no go.
3. Indicates both the starting point and the ending point of the process steps.
4. Shows where an in-process measurement occurs.
5. Represents an individual step or activity in the process.
6. B. Describe the following elements of a flowchart.
7. Terminator 9. Arrow line
8. Process 10. Decision
9. Sub-process
A. Directions:
Complete the flowchart template by inputting the steps in purchasing a
keyboard. Write your answer in your TLE notebook.
STEPS
o Look for another computer store
o You have now your new keyboard
o Make payment
o Is there a keyboard available in a
computer store?
o Take the keyboard
o Buying keyboard
What I have Learned
Answer the following questions briefly in your TLE activity
notebook.
1. What are the symbols used in technical drawing?
2. How do you interpret flowchart?
3. Can technical drawing be applied in real life situation? Why?
What I Can Do

10. 7
Preparation
of
Flowcharts
4 3 2 1
Drawing All assigned
details and
elements
have been
added. The
details are
clear and
easy to
identify.
Almost all
assigned
details /
elements (at
least 85%)
have been
added. The
details are
clear and easy
to identify.
Almost all
assigned
details and
elements (at
least 85%)
have been
added. A few
details are
difficult to
identify.
Fewer than
85% of the
assigned
details and
elements are
present OR
most details
are difficult to
identify.
Assessment
Directions: Write the answers of the assessment activities in your TLE activity
notebook.
A. Complete the table of the basic flowchart.
Name Symbol Functions
1. 6. 11.
2. 7. 12.
3. 8. 13.
4. 9. 14.
5. 10. 15.
B. MULTIPLE CHOICE: Read each statement carefully. Chose the LETTER of the
correct answer.
16. A diagram that uses graphic symbols to depict the nature and flow of the steps
in a process.
a. sub-process b. decision c. process d. terminator
17. It is represented by a diamond. A Process that can answer “yes “ or “no”.
a. sub-process b. decision c. process d. terminator
18. Drawn in one direction, preferably from top to bottom, keep a flowchart clear.
a. connector b. decision c. process d. arrow lines
19. It is represented by a rectangle and it refers to an action in a business
process. a. sub-process b. decision c. process d. terminator 20. A diagram that
uses graphic symbols to depict the nature and flow of the steps in a process.
a. flowchart b. element c. symbol d. function 21. This tool can help identify
rework and redundant or unnecessary steps within a process.
a. linear flowchart b. flowchart c. symbol d. deployment flowchart 22.
Shows where an in-process measurement occurs.
a. triangle b. circle c. diamond d. box

11. 8
23. This type of chart shows where the people or group fit into the process
sequence and how they relate to one another throughout the process.
a. linear flowchart b. flowchart c. symbol d. deployment flowchart 24.
The following are the 3 main types of flowchart except___.
a. linear flowchart c. symbol
b. opportunity flowchart d. deployment flowchart
25. Interpreting the flowchart will help you.
a. provide training b. determining who is involved
c. identify ways to streamline d. all of the above

12. 9

13. 10
Lesson
2
Prepare / make changes to electrical /
electronic schematics and drawing
Direction: Name the picture of the following symbols. Write only the letter of the
correct answer in your TLE activity notebook.
1.
4.
7. 10.
2.
5.
8.
3.
6.
9.
To produce a quality and marketable electronic diagram, you have to
follow the Electronic Drafting Standards which is the process of illustrating
various kinds of circuits and wiring systems. One of the most common
graphical languages used in the illustration of components in circuits is the
schematic diagrams.
What I Know

14. 11
1. What is electrical / electronic schematic Diagram?
2. What are the different schematic symbols?
Most symbols that you will encounter in laying out electronic diagrams
are accepted as standard. Below are the Schematic Symbols of Electronic
Components
All electronic circuits from the simplest to the most complex design need
diagrams to be used as reference in designing, modifying, and
troubleshooting the circuit. One of the most common used electronic diagram
is schematic diagram.
Schematic diagram – A diagram that shows the components used in their
interconnection. Each graphic symbol is also accompanied with a reference
designation to distinguish it from other similar symbols. It does not illustrate the
What’s In
What is It

15. 12
physical size, shape or chassis location of the component parts and devices.
A simple schematic diagram of DC output power supply.
Identify different kinds of Technical Drawing Instrument
Drawing instrument Description Use
ELECTRONIC
TEMPLATE
A thin flexible plastic with different
electronic and electrical symbols.
The symbols can be
traced using a
technical pen or pencil
in laying out
schematic diagrams.
DRAWING BOARD A smooth board usually
rectangular in shape provided with
perfectly straight edge which is
used as working edge on which the
T- square is moved while making
drawings
Used as working edge
on which T-square is
moved while making
drawings.
COMPASS
The compass has two legs hinged
at one end. One of the legs has
pointed needle fitted at the lower
end where as the other end has
provision for inserting
pencil lead.
A compass is used for
drawing circles and
arcs of circles.
DRAWING PINS These are usually made of pointed
metal and plastic head with
different colors.
These are used to fix
the drawing sheet on
the drawing board.
PROTRACTOR They are semi-circular in shape
and are made of plastic.
Protractors are used
to mark or measure
angles between 0 and
180o.
T-
SQUARE
It consists of two parts namely the
stock and the blade joined
together at right angles to each
other by means of screws.
The working edge of a
T- square is used to
draw parallel lines,
vertical lines or
inclined lines at 30 or
60 degrees.

16. 13
DRAWING PENCIL
Drawing pencils. The accuracy and
appearance of a drawing depends
on the quality of pencil used to
make drawing. The grade of a
pencil lead is marked on the pencil.
HB denotes medium grade.
Increase in hardness is shown by
the value put in front of H such as
2H, 3H, etc. Softer pencils are
marked as 2B, 3B, and 4B etc. A
pencil marked 3B is softer than 2B
and pencil marked 4B is softer
than 3B and so on. Beginning of a
drawing may be made with H or
2H. For lettering and dimensioning,
H or HB pencils are used.
Drawing pencil is use
to make drawing
SET SQUARES Set squares are generally made
from plastic material. They are
triangular in shape with one
corner, a triangle. A pair of set
squares (30o- 60o) and 45o. They
are used to draw lines at 30o, 60o
and 45o to the vertical or horizontal
They are used to draw
lines at 30o, 60o and
45o to the vertical or
horizontal.
A. Given the table below list down the different kinds of technical drawing instruments
and its uses.
Write your answer on your TLE activity notebook.
Name of drawing
instruments
Uses
1 1
2 2
3 3
4 4
5 5
What’s More

17. 14
What I Have learned
A. Directions:
Use the components of electronic devices given below to create a schematic
diagram of DC output power supply.
Schematic
drawing
4 3 2 1
Drawing All assigned
components
have been
added. The
details are
clear and
easy to
identify.
Almost all
assigned
components
(at least 85%)
have been
added. The
details are
clear and easy
to identify.
Almost all
assigned
components
(at least 85%)
have been
added. A few
details are
difficult to
identify.
Fewer than
85% of the
assigned
components
are present
OR most
details are
difficult to
identify.

18. 15
Store Technical Drawings and Equipment / Instruments
Tools are often delicate and have many intricate and small pieces that need to
be well maintained to continue working properly. Organizing and storing these items
has a great deal to do with keeping them in pristine shape and working correctly.
With a little patience and developing a routine, your tools will be well taken care of
and working for a long time.
1. Lay out all the tools that you use and separate them into piles of like items.
Place all pencils together, markers, erasers, rulers, stencils, paper and
miscellaneous.
2. Using the cleaner, spray the cloth and wipe down supplies that have residue on
them. Pencils, markers, stencils and rulers often retain oils on them from
fingers.
3. Take the erasers and rub out any black marks. Do this by rubbing the eraser
against a clean piece of paper until the black smudge has disappeared. For
kneaded erasers, these can simply be stretched and remodelled into a ball,
similar to bread dough, to get the black smudge marks out.
4. Run your hands through your drafting brush to remove any loose debris. Then,
wipe it down with the cleaning cloth to remove any residue from the handle.
5. Roll up your drafting papers into a tight roll. Secure them with a rubber band
at each end. Place the roll into a drafting tube for storage.
6. Place the pens and markers into the long slots of the organizer tray. Place the
erasers in the smaller cube slots. Fill in with any other drafting materials, such
as lead refills, push pins, paper clips, small rulers and mounting stickers.
7. Take your compass and wipe it off with the cleaning cloth. If it is going to be
stored in the organizer tray, wind the compass down until it is straight (versus
at an angle, making a triangle shape). If it has its own case, then wind it to the
size the case has set for it to be stored, and place it into the box.
8. Make a folder to hold all your stencils. Create holding flaps in an ascending
order so the stencils can be layered and easy to see and access when needed.
To make these flaps, simply use card stock paper and cut it into 3- or 4-inch
sections. Glue each section onto a large main piece of card stock, starting
towards the top for the smallest stencil and working your way down to the
bottom. Glue three of the four edges, leaving the top edge open for the stencil to
slide into.
9. Place this newly made stencil holder into a large plastic or mesh pouch. Put a
dry cleaning cloth in the pouch, placed over the stencils, to help keep them
clean.
10.Place the drafting brush and rulers into the pouch. Then place the organizer
tray into the pouch. If the compass had its own storage box, then place this in
the pouch. All the major tools should now be in this portable carrying pouch
with your paper in the separate portable carrying drafting tube.

19. 16
PROCEDURES IN RECEIVING AND STORING TOOLS AND MATERIALS
Inventory
Inventory is the collection of the idle stock of physical goods that contain economic
value, and are held in various forms by an organization in its custody awaiting packing
processing, transformation, use or sale in a future point of time.
Inventory Form
The inventory form contains information about items (name, number, sales and
purchase information, and cost of goods sold account information) that any business
purchases, tracks in inventory, and displays on a balance sheet.
BELOW IS A SAMPLE FOR AN INVENTORY RECORD
Name: Date:
Signature: School/Department:
Item
Name
Quantity Brand Remarks
(good condition,
needs repair,
condemnable,
needs
replacement)
Purchased
Date
Purchased
Price
Drawing pencil 3 Mongol #3 Good condition 8/3/2019 P25.00
BELOW IS A SAMPLE FOR A BORROWER SLIP
Name: Date release:
Signature: Date return:
Name of Item Quantity Description Remarks
Pencil 1 Pointed tip used for drawing Good condition
In-charge:_____________________ Date:___________
Name & Signature

20. 17
A. Directions: True / False
Write T if the proceeding statement is True and F if False in otherwise. Use TLE activity
notebook for your answer.
____________1. It requires physically and mentally fit when working.
____________2. Prevention is better than cure.
____________3. After the work is done, clean and return tools / equipment in
their proper places.
____________4. Kept a record of tools/equipment to avoid issues and prevent
down time.
____________5. Examine the tools / equipment before and after its use.
____________6. Don't kept a log for completed maintenance of
tools/equipment.
____________7. Use tools for the specific job or task to be done.
____________8. Improper use of tools / equipment may prolong its life span.
____________9. Use tools even if you are not familiar to it.
____________10. Keep a record if accidents happened.
What’s More
What I Have Learned
In this part, please share what have you learned with the topic that you’ve
encountered.
1. I have learned that___________________________________________
2. I have realized that___________________________________________
3. I will apply __________________________________________________

21. 18
A. Directions: Using the inventory form below list down the different kinds of
technical drawing. Write your answer in your TLE activity notebook.
Name: Date Process: Signature: Department:
Item
Name
Quantity Brand Remarks
(good condition, needs repair,
condemnable, needs
replacement)
Purchased
Date
Purchase
d Price
1
2
3
4
5
A. Essay: Write your answer in your TLE activity notebook.
1. Is there a possibility that symbols and details in schematic drawing is
not clear? Why?
2. What are the ways to conduct a regular maintenance on tools/
equipment to avoid issues and down time?
B. Given the table below list down the different kinds of Technical Drawings.
Name of Drawing
instrument
Description Use
1.
2.
3.
4.
5.
6.
7.
8.
What I Can Do
Assessment

22. 19

23. 20
References
Ramilo, Ronald V. et.al. 2013. Computer Hardware Servicng 7/8 Exploratory Course.
June 16. https"//www.slideshare.net/kenjoyb/k-to-12-pchardware-servicing-
learning-module.
#1482267, Computer Cartoon Image. walang petsa. clipart library. http://clipart-
library.com/clipart/8iA5eAria.htm.
L 1
•1http://machineshop.olin.edu/resources/documents/Technical%20Drawing%2
0%20Class%20Handout.pdf • www.breezetree.com/.
• www.patton-patton.com/basic_flow_chart_sy.http://www.lakeland
• www.tesda.gov.ph
•www.edrawsoft.com/flowchart.php
•http://www.eod.gvsu.edu/~blaucha/c2d2/Structured%20Design%20Using%20Flowcharts.pdf
L 2
Bermas, Dante B. et.al. 2013. Mechanical Drafting 7/8 Exploratory Course.
https://www.slideshare.net/markleen/tle-mechanical-drafting-
learningmodule?qid=cd6e3b85-9406-4066-8a06-
16247e7f3436&v=&b=&from_search=8.
Giesecke,Mitchell and Spencer, technical Drawing; The macmillan Company:1999
Manaois, German M., Drafting 1 and 2; Phoenix Publishing:1963
Esguerra and Molino, Exploratory Dafting; Abiva Publishing: 1980
Stirling, Norman, Introduction to technical Drawing, Metric Edition
Tan, Marcelo E. Ed. D et.al. 2013. Consumer Electronic Servicing 7/8 Exploratory
Course.https://www.slideshare.net/skyrocker0004/consumerelectronicsservicingle
arningmodule?qid=5de354b7-5593-4b36-
91727779cbddab15&v=&b=&from_search=5
Enriquez, Marcelo T., Electronics Technology IV; Souvenir Publications, Inc:2003
L Tan, Michael Q., Gantalao, Fred T., Lasala, Rommel M. Simple Electronics; 2004
Andres Mountain Printers; 2004
Haynes, Sarah. How to Take care of drafting Tools, 2017
https://homesteady.com/12170358/how-to-take-care-of-drafting-tools

24. 21
For inquiries or feedback, please write or call:
Department of Education – Schools Division of Negros Oriental
Kagawasan, Avenue, Daro, Dumaguete City, Negros Oriental
Tel #: (035) 225 2376 / 541 1117
Email Address: negros.oriental@deped.gov.ph
Website: lrmds.depednodis.net